adding examples for the stemma ir transceiver

Adding CP and Arduino examples for the IR transceiver guide

STEMMA_IR_Transceiver_Examples/Arduino_STEMMA_IR_Transceiver/Arduino_STEMMA_IR_Transceiver.ino

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+// SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+/*
+ * Based on the SimpleReceiver.cpp and SimpleSender.cpp from the
+ * Arduino-IRremote https://github.com/Arduino-IRremote/Arduino-IRremote.
+ * by Armin Joachimsmeyer
+ ************************************************************************************
+ * MIT License
+ *
+ * Copyright (c) 2020-2023 Armin Joachimsmeyer
+ * 
+ */
+
+#include <Arduino.h>
+
+#include <IRremote.hpp> // include the library
+#define IR_RECEIVE_PIN   5
+#define IR_SEND_PIN      6
+
+void setup() {
+    Serial.begin(115200);
+    while (!Serial)
+        ;
+    Serial.println("Adafruit STEMMA IR Transceiver Demo");
+    IrReceiver.begin(IR_RECEIVE_PIN);
+    IrSender.begin(IR_SEND_PIN); // Start with IR_SEND_PIN -which is defined in PinDefinitionsAndMore.h- as send pin and enable feedback LED at default feedback LED pin
+    Serial.print("IRin on pin ");
+    Serial.print(IR_RECEIVE_PIN);
+    Serial.print(", IRout on pin ");
+    Serial.println(IR_SEND_PIN);
+}
+
+uint8_t sCommand = 0x34;
+uint8_t sRepeats = 0;
+
+void loop() {
+    /*
+     * Check if received data is available and if yes, try to decode it.
+     * Decoded result is in the IrReceiver.decodedIRData structure.
+     *
+     * E.g. command is in IrReceiver.decodedIRData.command
+     * address is in command is in IrReceiver.decodedIRData.address
+     * and up to 32 bit raw data in IrReceiver.decodedIRData.decodedRawData
+     */
+    if (IrReceiver.decode()) {
+        if (IrReceiver.decodedIRData.protocol == UNKNOWN) {
+            IrReceiver.printIRResultRawFormatted(&Serial, true);
+            IrReceiver.resume();
+        } else {
+            IrReceiver.resume();
+            IrReceiver.printIRResultShort(&Serial);
+            IrReceiver.printIRSendUsage(&Serial);
+            delay(1000);
+            Serial.println("Sending received command..");
+            IrSender.sendNEC(IrReceiver.lastDecodedProtocol, IrReceiver.lastDecodedCommand, IrReceiver.repeatCount);
+            delay(1000);
+            Serial.print("Sent!");
+            //Serial.println(IrReceiver.lastDecodedProtocol, IrReceiver.lastDecodedCommand, IrReceiver.repeatCount);
+        }
+        Serial.println();
+    }
+}

STEMMA_IR_Transceiver_Examples/CircuitPython/code.py

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+# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import array
+import pulseio
+import board
+import adafruit_irremote
+
+# Create a 'PulseOut' to send infrared signals on the IR transmitter @ 38KHz
+pulseout = pulseio.PulseOut(board.D6, frequency=38000, duty_cycle=2**15)
+# Create an encoder that will take numbers and turn them into NEC IR pulses
+encoder = adafruit_irremote.GenericTransmit(header=[9000, 4500],
+                                            one=[560, 1700],
+                                            zero=[560, 560],
+                                            trail=0)
+# IR receiver setup
+ir_receiver = pulseio.PulseIn(board.D5, maxlen=120, idle_state=True)
+decoder = adafruit_irremote.GenericDecode()
+
+while True:
+    pulses = decoder.read_pulses(ir_receiver)
+    try:
+        # Attempt to decode the received pulses
+        received_code = decoder.decode_bits(pulses)
+        if received_code:
+            hex_code = ''.join(["%02X" % x for x in received_code])
+            print(f"Received: {hex_code}")
+            # Convert pulses to an array of type 'H' (unsigned short)
+            pulse_array = array.array('H', pulses)
+            # send code back using original pulses
+            pulseout.send(pulse_array)
+            print(f"Sent: {pulse_array}")
+    except adafruit_irremote.IRNECRepeatException:  # Signal was repeated, ignore
+        pass
+    except adafruit_irremote.IRDecodeException:  # Failed to decode signal
+        print("Error decoding")
+    ir_receiver.clear()  # Clear the receiver buffer
+    time.sleep(1)  # Delay to allow the receiver to settle
+    print()