ported to CircuitPython

DIY_Thermal_Light_Painting/DIY_Thermal_Light_Painting.ino

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+/*************************************************** 
+This is a library for the MLX90614 temperature sensor SPECIFICALLY
+FOR USE WITH TINYWIREM ON TRINKET/GEMMA
+
+Requires the latest TinyWireM with repeated-start support
+https://github.com/adafruit/TinyWireM
+
+NOT FOR REGULAR ARDUINOS! Use the regular Adafruit_MLX90614 for that
+
+  Designed specifically to work with the MLX90614 sensors in the
+  adafruit shop
+  ----> https://www.adafruit.com/products/1748
+  ----> https://www.adafruit.com/products/1749
+
+  These sensors use I2C to communicate, 2 pins are required to  
+  interface
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit in any redistribution
+ ****************************************************/
+
+#include <TinyWireM.h>
+#include <Adafruit_MiniMLX90614.h>
+#include <Adafruit_NeoPixel.h>
+
+// change these to adjust the range of temperatures you want to measure 
+// (these are in Farenheit)
+#define COLDTEMP 60
+#define HOTTEMP  80
+
+
+#define PIN 1
+Adafruit_NeoPixel strip = Adafruit_NeoPixel(24, PIN, NEO_GRB + NEO_KHZ800);
+
+Adafruit_MiniMLX90614 mlx = Adafruit_MiniMLX90614();
+
+void setup() {
+  mlx.begin();  
+  strip.begin();
+  strip.show(); // Initialize all pixels to 'off'
+}
+
+void loop() {
+  uint8_t red, blue;
+  float temp = mlx.readObjectTempF();
+
+  if (temp < COLDTEMP) temp = COLDTEMP;
+  if (temp > HOTTEMP) temp = HOTTEMP;
+
+  // map temperature to red/blue color
+  // hotter temp -> more red
+  red = map(temp, COLDTEMP, HOTTEMP, 0, 255);  
+  // hotter temp -> less blue
+  blue = map(temp, COLDTEMP, HOTTEMP, 255, 0);  
+
+  colorWipe(strip.Color(red, 0, blue), 0);
+  
+  delay(50); // can adjust this for faster/slower updates
+}
+
+// Fill the dots one after the other with a color
+void colorWipe(uint32_t c, uint8_t wait) {
+  for(uint16_t i=0; i<strip.numPixels(); i++) {
+      strip.setPixelColor(i, c);
+      strip.show();
+      delay(wait);
+  }
+}

DIY_Thermal_Light_Painting/DIY_Thermal_Light_Painting.py

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+#  Designed specifically to work with the MLX90614 sensors in the
+#  adafruit shop
+#  ----> https://www.adafruit.com/products/1748
+#  ----> https://www.adafruit.com/products/1749
+#
+#  These sensors use I2C to communicate, 2 pins are required to
+#  interface Adafruit invests time and resources providing this open
+#  source code,
+#  please support Adafruit and open-source hardware by purchasing
+#  products from Adafruit!
+
+import board
+import time
+import busio as io   
+import neopixel
+import adafruit_mlx90614
+
+# use bitbangio only with ESP8266 
+# * does not support hardware i2c
+# * comment out busio above
+# * express boards can use also bitbangio, but they have i2c hardware built-in
+#import bitbangio as io 
+
+# the mlx90614 must be run at 100k [normal speed]
+# i2c default mode is is 400k [full speed] 
+# the mlx90614 will not appear at the default 400k speed
+i2c = io.I2C(board.SCL, board.SDA, frequency=100000) 
+mlx = adafruit_mlx90614.MLX90614(i2c)
+
+# neopixel setup 
+num_leds = 24           # how many LEDs 
+led_pin = board.D1      # which pin the neopixel ring is connected to
+strip = neopixel.NeoPixel(led_pin, num_leds, brightness=1)
+
+# change these to adjust the range of temperatures you want to measure
+# (these are in Farenheit)
+cold_temp = 60
+hot_temp = 80
+
+def remapRange(value, leftMin, leftMax, rightMin, rightMax):
+    # this remaps a value from original (left) range to new (right) range
+    # Figure out how 'wide' each range is
+    leftSpan = leftMax - leftMin
+    rightSpan = rightMax - rightMin
+
+    # Convert the left range into a 0-1 range (int)
+    valueScaled = int(value - leftMin) / int(leftSpan)
+
+    # Convert the 0-1 range into a value in the right range.
+    return int(rightMin + (valueScaled * rightSpan))
+
+# Fill the dots one after the other with a color
+def colorWipe(color):
+    for j in range(len(strip)):
+        strip[j] = (color)
+
+while True:
+    temp = mlx.read_object_temp_f
+
+    if (temp < cold_temp ):
+        temp = cold_temp
+
+    if (temp > hot_temp):
+        temp = hot_temp
+
+    # map temperature to red/blue color
+    # hotter temp -> more red
+    red = remapRange(temp, cold_temp, hot_temp, 0, 255)
+    # hotter temp -> less blue
+    blue = remapRange(temp, cold_temp, hot_temp, 255, 0)
+
+    colorWipe((red, 0, blue))
+
+    # can adjust this for faster/slower updates
+    time.sleep(.05) 

DIY_Thermal_Light_Painting/README.md

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+# DIY_Thermal_Light_Painting
+
+Code to accompany this Adafruit tutorial:
+https://learn.adafruit.com/diy-flir-light-painting-heat-map-photography