add examples
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4 changed files with 383 additions and 6 deletions
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@ -57,25 +57,31 @@ bool Adafruit_MPR121::begin(uint8_t i2caddr, TwoWire *theWire,
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}
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i2c_dev = new Adafruit_I2CDevice(i2caddr, theWire);
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Serial.println("Adafruit_I2CDevice setup..");
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if (!i2c_dev->begin()) {
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Serial.println("i2c_dev begin failed..");
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return false;
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}
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Serial.println("done.");
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Serial.println("send soft reset..");
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// soft reset
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writeRegister(MPR121_SOFTRESET, 0x63);
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delay(1);
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for (uint8_t i = 0; i < 0x7F; i++) {
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// Serial.print("$"); Serial.print(i, HEX);
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// Serial.print(": 0x"); Serial.println(readRegister8(i));
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// Serial.print(": 0x"); Serial.println(readRegister8(i), HEX);
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}
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writeRegister(MPR121_ECR, 0x0);
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Serial.print("read: MPR121_CONFIG2 ");
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uint8_t c = readRegister8(MPR121_CONFIG2);
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Serial.println(c, HEX);
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if (c != 0x24)
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return false;
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Serial.println("write Configuration to sensor ...");
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setThresholds(touchThreshold, releaseThreshold);
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writeRegister(MPR121_MHDR, 0x01);
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writeRegister(MPR121_NHDR, 0x01);
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@ -101,7 +107,7 @@ bool Adafruit_MPR121::begin(uint8_t i2caddr, TwoWire *theWire,
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// CL Calibration Lock: B10 = 5 bits for baseline tracking
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// ELEPROX_EN proximity: disabled
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// ELE_EN Electrode Enable: amount of electrodes running (12)
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byte ECR_SETTING = B10000000 + 12;
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byte ECR_SETTING = 0b10000000 + 12;
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writeRegister(MPR121_ECR, ECR_SETTING); // start with above ECR setting
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return true;
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@ -144,8 +150,8 @@ void Adafruit_MPR121::setAutoconfig(boolean autoconfig) {
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// BVA same as CL in ECR
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// ARE Auto-Reconfiguration Enable
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// ACE Auto-Configuration Enable
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// 0x0B == B00001011
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writeRegister(MPR121_AUTOCONFIG0, B00001011);
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// 0x0B == 0b00001011
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writeRegister(MPR121_AUTOCONFIG0, 0b00001011);
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// details on values
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// https://www.nxp.com/docs/en/application-note/AN3889.pdf#page=7&zoom=310,-42,792
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@ -155,7 +161,7 @@ void Adafruit_MPR121::setAutoconfig(boolean autoconfig) {
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writeRegister(MPR121_LOWLIMIT, 130); // UPLIMIT * 0.65
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} else {
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// really only disable ACE.
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writeRegister(MPR121_AUTOCONFIG0, B00001010);
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writeRegister(MPR121_AUTOCONFIG0, 0b00001010);
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}
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}
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111
examples/MPR121-AutoConfig/MPR121-AutoConfig.ino
Normal file
111
examples/MPR121-AutoConfig/MPR121-AutoConfig.ino
Normal file
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@ -0,0 +1,111 @@
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/*********************************************************
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This is a library for the MPR121 12-channel Capacitive touch sensor
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Designed specifically to work with the MPR121 Breakout in the Adafruit shop
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----> https://www.adafruit.com/products/
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These sensors use I2C communicate, at least 2 pins are required
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to interface
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this sketch demonstrates the auto-config chip-funktionality.
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for more information have a look at
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https://github.com/adafruit/Adafruit_MPR121/issues/39
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https://github.com/adafruit/Adafruit_MPR121/pull/43
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based on MPR121test
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modified & extended by Carter Nelson/caternuson
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MIT license, all text above must be included in any redistribution
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**********************************************************/
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#include <Wire.h>
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#include <Adafruit_MPR121.h>
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#ifndef _BV
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#define _BV(bit) (1 << (bit))
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#endif
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Adafruit_MPR121 cap = Adafruit_MPR121();
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// Keeps track of the last pins touched
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// so we know when buttons are 'released'
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uint16_t lasttouched = 0;
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uint16_t currtouched = 0;
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void dump_regs() {
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Serial.println("========================================");
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Serial.println("CHAN 00 01 02 03 04 05 06 07 08 09 10 11");
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Serial.println(" -- -- -- -- -- -- -- -- -- -- -- --");
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// CDC
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Serial.print("CDC: ");
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for (int chan=0; chan<12; chan++) {
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uint8_t reg = cap.readRegister8(0x5F+chan);
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if (reg < 10) Serial.print(" ");
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Serial.print(reg);
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Serial.print(" ");
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}
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Serial.println();
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// CDT
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Serial.print("CDT: ");
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for (int chan=0; chan<6; chan++) {
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uint8_t reg = cap.readRegister8(0x6C+chan);
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uint8_t cdtx = reg & 0b111;
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uint8_t cdty = (reg >> 4) & 0b111;
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if (cdtx < 10) Serial.print(" ");
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Serial.print(cdtx);
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Serial.print(" ");
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if (cdty < 10) Serial.print(" ");
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Serial.print(cdty);
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Serial.print(" ");
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}
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Serial.println();
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Serial.println("========================================");
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}
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void setup() {
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delay(1000);
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Serial.begin(115200);
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while (!Serial);
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Serial.println("MPR121 Autoconfiguration Test. (MPR121-AutoConfig.ino)");
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Serial.println("startup `Wire`");
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Wire.begin();
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Serial.println("startup `Wire` done.");
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delay(100);
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Serial.println("cap.begin..");
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if (!cap.begin(0x5A, &Wire)) {
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Serial.println("MPR121 not found, check wiring?");
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while (1);
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}
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Serial.println("MPR121 found!");
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delay(100);
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Serial.println("Initial CDC/CDT values:");
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dump_regs();
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cap.setAutoconfig(true);
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Serial.println("After autoconfig CDC/CDT values:");
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dump_regs();
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}
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void loop() {
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// Get the currently touched pads
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currtouched = cap.touched();
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for (uint8_t i=0; i<12; i++) {
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// it if *is* touched and *wasnt* touched before, alert!
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if ((currtouched & _BV(i)) && !(lasttouched & _BV(i)) ) {
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Serial.print(i); Serial.println(" touched");
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}
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// if it *was* touched and now *isnt*, alert!
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if (!(currtouched & _BV(i)) && (lasttouched & _BV(i)) ) {
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Serial.print(i); Serial.println(" released");
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}
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}
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// reset our state
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lasttouched = currtouched;
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}
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190
examples/MPR121-Plot/MPR121-Plot SerialPlotConfig.ini
Normal file
190
examples/MPR121-Plot/MPR121-Plot SerialPlotConfig.ini
Normal file
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@ -0,0 +1,190 @@
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[Channels]
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channel\1\color=@Variant(\0\0\0\x43\x1\xff\xff\xff\xff\xff\xff\0\0\0\0)
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channel\1\gain=1
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channel\1\gainEnabled=false
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channel\1\name=0 touched
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channel\1\offset=0
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channel\1\offsetEnabled=false
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channel\1\visible=true
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channel\10\color=@Variant(\0\0\0\x43\x1\xff\xffUUUU\xff\xff\0\0)
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channel\10\gain=1
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channel\10\gainEnabled=false
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channel\10\name=3 touched
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channel\10\offset=0
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channel\10\offsetEnabled=false
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channel\10\visible=true
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channel\11\color=@Variant(\0\0\0\x43\x1\xff\xff\x87\x87\x87\x87\xff\xff\0\0)
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channel\11\gain=1
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channel\11\gainEnabled=false
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channel\11\name=3 baseline
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channel\11\offset=0
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channel\11\offsetEnabled=false
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channel\11\visible=true
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channel\12\color="@Variant(\0\0\0\x43\x1\xff\xffhh==;;\0\0)"
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channel\12\gain=1
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channel\12\gainEnabled=false
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channel\12\name=3 filtered
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channel\12\offset=0
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channel\12\offsetEnabled=false
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channel\12\visible=true
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channel\13\color=@Variant(\0\0\0\x43\x1\xff\xff\0\0\0\0\xff\xff\0\0)
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channel\13\gain=1
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channel\13\gainEnabled=false
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channel\13\name=4 touched
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channel\13\offset=0
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channel\13\offsetEnabled=false
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channel\13\visible=true
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channel\14\color=@Variant(\0\0\0\x43\x1\xff\xffUUUU\xff\xff\0\0)
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channel\14\gain=1
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channel\14\gainEnabled=false
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channel\14\name=4 baseline
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channel\14\offset=0
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channel\14\offsetEnabled=false
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channel\14\visible=true
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channel\15\color=@Variant(\0\0\0\x43\x1\xff\xffUUUU\xff\xff\0\0)
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channel\15\gain=1
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channel\15\gainEnabled=false
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channel\15\name=4 filtered
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channel\15\offset=0
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channel\15\offsetEnabled=false
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channel\15\visible=true
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channel\2\color=@Variant(\0\0\0\x43\x1\xff\xff\xff\xff\xaa\xaa\0\0\0\0)
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channel\2\gain=1
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channel\2\gainEnabled=false
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channel\2\name=0 baseline
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channel\2\offset=0
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channel\2\offsetEnabled=false
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channel\2\visible=true
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channel\3\color=@Variant(\0\0\0\x43\x1\xff\xff\xff\xffUU\0\0\0\0)
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channel\3\gain=1
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channel\3\gainEnabled=false
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channel\3\name=0 filtered
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channel\3\offset=0
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channel\3\offsetEnabled=false
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channel\3\visible=true
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channel\4\color=@Variant(\0\0\0\x43\x1\xff\xff\0\0\0\0\xff\xff\0\0)
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channel\4\gain=1
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channel\4\gainEnabled=false
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channel\4\name=1 touched
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channel\4\offset=0
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channel\4\offsetEnabled=false
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channel\4\visible=true
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channel\5\color=@Variant(\0\0\0\x43\x1\xff\xff\0\0\0\0\x7f\x7f\0\0)
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channel\5\gain=1
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channel\5\gainEnabled=true
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channel\5\name=1 baseline
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channel\5\offset=0
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channel\5\offsetEnabled=false
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channel\5\visible=true
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channel\6\color=@Variant(\0\0\0\x43\x1\xff\xff\0\0\xaa\xaa\xff\xff\0\0)
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channel\6\gain=1
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channel\6\gainEnabled=false
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channel\6\name=1 filtered
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channel\6\offset=0
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channel\6\offsetEnabled=false
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channel\6\visible=true
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channel\7\color=@Variant(\0\0\0\x43\x1\xff\xff\x87\x87\xff\xffKK\0\0)
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channel\7\gain=1
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channel\7\gainEnabled=false
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channel\7\name=2 touched
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channel\7\offset=0
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channel\7\offsetEnabled=false
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channel\7\visible=true
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channel\8\color=@Variant(\0\0\0\x43\x1\xff\xff\xbc\xbc\xff\xff\x9b\x9b\0\0)
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channel\8\gain=1
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channel\8\gainEnabled=false
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channel\8\name=2 baseline
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channel\8\offset=0
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channel\8\offsetEnabled=false
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channel\8\visible=true
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channel\9\color=@Variant(\0\0\0\x43\x1\xff\xff\0\0\0\0\xff\xff\0\0)
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channel\9\gain=1
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channel\9\gainEnabled=false
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channel\9\name=2 filtered
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channel\9\offset=0
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channel\9\offsetEnabled=false
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channel\9\visible=true
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channel\size=15
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[Commands]
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command\1\data=
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command\1\name=Command 1
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command\1\type=ascii
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command\size=1
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[DataFormat]
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format=ascii
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[DataFormat_ASCII]
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customDelimiter=";"
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delimiter=","
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filterMode=disabled
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filterPrefix=m/s^2
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hex=false
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numOfChannels=15
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[DataFormat_Binary]
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endianness=little
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numOfChannels=1
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numberFormat=uint8
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[DataFormat_CustomFrame]
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checksum=false
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debugMode=false
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endianness=little
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fixedSize=field1byte
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frameSize=1
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frameStart=AA BB
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numOfChannels=1
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numberFormat=uint8
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[MainWindow]
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activePanel=Plot
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hidePanels=false
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maximized=true
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pos=@Point(0 0)
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size=@Size(3072 1659)
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state=@ByteArray(\0\0\0\xff\0\0\0\0\xfd\0\0\0\0\0\0\f\0\0\0\x6\v\0\0\0\x4\0\0\0\x4\0\0\0\b\0\0\0\b\xfc\0\0\0\x1\0\0\0\x2\0\0\0\x3\0\0\0\f\0t\0\x62\0P\0l\0o\0t\x1\0\0\0\0\xff\xff\xff\xff\0\0\0\0\0\0\0\0\0\0\0\x1a\0t\0\x62\0P\0o\0r\0t\0\x43\0o\0n\0t\0r\0o\0l\x1\0\0\0\xdb\xff\xff\xff\xff\0\0\0\0\0\0\0\0\0\0\0\x10\0t\0\x62\0R\0\x65\0\x63\0o\0r\0\x64\x1\0\0\x2\x19\xff\xff\xff\xff\0\0\0\0\0\0\0\0)
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[Plot]
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autoScale=false
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darkBackground=true
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decimals=2
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grid=true
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indexAsX=true
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legend=true
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legendPos=bottomright
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lineThickness=2
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minorGrid=true
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multiPlot=false
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numLines=1000
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numOfSamples=1000
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plotWidth=1000
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symbols=auto
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xMax=100
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xMin=0
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yMax=750
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yMin=550
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[Port]
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baudRate=115200
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dataBits=8
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flowControl=none
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parity=none
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selectedPort=ttyACM0
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stopBits=1
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[Record]
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autoIncrement=true
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decimals=2
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disableBuffering=false
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header=true
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recordPaused=true
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separator=","
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stopOnClose=true
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timestamp=true
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timestampFormat=seconds_with_precision
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[UpdateCheck]
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lastCheck=2025-06-29
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periodicCheck=true
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70
examples/MPR121-Plot/MPR121-Plot.ino
Normal file
70
examples/MPR121-Plot/MPR121-Plot.ino
Normal file
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@ -0,0 +1,70 @@
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/*********************************************************
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This is a library for the MPR121 12-channel Capacitive touch sensor
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Designed specifically to work with the MPR121 Breakout in the Adafruit shop
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----> https://www.adafruit.com/products/
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These sensors use I2C communicate, at least 2 pins are required
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to interface
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based on MPR121test
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modified & extended by Stefan Krüger
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**********************************************************/
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#include <Adafruit_MPR121.h>
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#include <Wire.h>
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#ifndef _BV
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#define _BV(bit) (1 << (bit))
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#endif
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Adafruit_MPR121 cap = Adafruit_MPR121();
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const uint8_t channelFirst = 0;
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const uint8_t channelLast = 5; // max 13
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uint16_t currTouched;
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void plotValues() {
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currTouched = cap.touched();
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for (int chan = channelFirst; chan <= channelLast; chan++) {
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if (currTouched & _BV(chan)) {
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Serial.print("550,");
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} else {
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Serial.print("0,");
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}
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Serial.print(cap.filteredData(chan));
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Serial.print(",");
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Serial.print(cap.filteredData(chan));
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Serial.print(", ");
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// uint8_t reg = cap.readRegister8(0x5F + chan);
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// if (reg < 10)
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// Serial.print(" ");
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// Serial.print(reg);
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}
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Serial.println();
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}
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void setup() {
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delay(1000);
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Serial.begin(115200);
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while (!Serial);
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Serial.println("MPR121 Autoconfiguration Test. (MPR121-AutoConfig.ino)");
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Wire.begin();
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if (!cap.begin(0x5A, &Wire)) {
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Serial.println("MPR121 not found, check wiring?");
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while (1);
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}
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Serial.println("MPR121 found!");
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cap.setAutoconfig(true);
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}
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void loop() {
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plotValues();
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delay(10);
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}
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