adding python AIO example

Adding color picker example for Pixel Trinkey. Trinkey runs an arduino sketch listening for a color value on the COM port. Python desktop sketch listens for a new color from an AIO feed

Author: BlitzCityDIY

Neo_Trinkey_Examples/Python_AdafruitIO_Color_Picker/Arduino_Serial_Color_Picker/Arduino_Serial_Color_Picker.ino

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+// SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <Adafruit_NeoPixel.h>
+
+#define NUMPIXELS 30
+Adafruit_NeoPixel neostrip(NUMPIXELS, PIN_DATA, NEO_GRB + NEO_KHZ800);
+
+char colorBuffer[9]; // Buffer to hold the incoming color data (0x000000)
+int bufferIndex = 0; // Index for the buffer
+
+void setup() {
+  Serial.begin(115200);
+
+  neostrip.begin();
+  neostrip.setBrightness(25);
+  neostrip.show();
+  memset(colorBuffer, 0, sizeof(colorBuffer)); // Clear the buffer
+}
+
+void loop() {
+  // Check if data is available on the serial port
+  while (Serial.available() > 0) {
+    char incomingByte = Serial.read();
+    
+    // Check if the incoming byte is part of the color data
+    if (isxdigit(incomingByte) || incomingByte == 'x') {
+      colorBuffer[bufferIndex++] = incomingByte; // Add the byte to the buffer
+    }
+    
+    // If the buffer is full, process the color data
+    if (bufferIndex == 8) {
+      colorBuffer[8] = '\0'; // Null-terminate the string
+      
+      // Convert the hex string to a 32-bit integer
+      uint32_t color = strtoul(colorBuffer, NULL, 16);
+      
+      // Extract RGB values from the color
+      uint8_t r = (color >> 16) & 0xFF;
+      uint8_t g = (color >> 8) & 0xFF;
+      uint8_t b = color & 0xFF;
+      
+      // Set the NeoPixels to the received color
+      for (int i = 0; i < NUMPIXELS; i++) {
+        neostrip.setPixelColor(i, neostrip.Color(r, g, b));
+      }
+      neostrip.show();
+      
+      // Clear the buffer and reset the bufferIndex
+      memset(colorBuffer, 0, sizeof(colorBuffer));
+      bufferIndex = 0;
+    }
+  }
+}

Neo_Trinkey_Examples/Python_AdafruitIO_Color_Picker/code.py

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+# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import serial
+from Adafruit_IO import Client, MQTTClient
+
+# Configuration
+com_port = 'COM123'  # Adjust this to your COM port
+baud_rate = 115200
+FEED_ID = 'pixel-feed'
+# Set to your Adafruit IO key.
+# Remember, your key is a secret,
+# so make sure not to publish it when you publish this code!
+ADAFRUIT_IO_KEY = 'your-aio-key'
+
+# Set to your Adafruit IO username.
+# (go to https://accounts.adafruit.com to find your username)
+ADAFRUIT_IO_USERNAME = 'your-aio-username'
+
+print("Connecting to Adafruit IO...")
+# Create an instance of the REST client.
+aio = Client(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
+
+# Initialize the serial connection
+ser = serial.Serial(com_port, baud_rate)
+
+# Define callback functions
+def connected(client):
+    client.subscribe(FEED_ID)
+# pylint: disable=unused-argument, consider-using-sys-exit
+def subscribe(client, userdata, mid, granted_qos):
+    # This method is called when the client subscribes to a new feed.
+    print(f"Subscribed to {FEED_ID}")
+
+def disconnected(client):
+    print('Disconnected from Adafruit IO!')
+    exit(1)
+
+def message(client, feed_id, payload):
+    print(f'Feed {feed_id} received new value: {payload}')
+    color_value = payload.strip().replace('#', '0x')  # Replace # with 0x
+    ser.write(color_value.encode())  # Send the color value to the serial port
+
+# Initialize the Adafruit IO MQTT client
+mqtt_client = MQTTClient(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
+
+# Setup the callback functions
+mqtt_client.on_connect = connected
+mqtt_client.on_disconnect = disconnected
+mqtt_client.on_message = message
+mqtt_client.on_subscribe  = subscribe
+
+# Connect to Adafruit IO
+mqtt_client.connect()
+
+# Start a background thread to listen for MQTT messages
+mqtt_client.loop_blocking()
+
+# Keep the script running
+while True:
+    try:
+        time.sleep(1)
+    except KeyboardInterrupt:
+        print('Script interrupted by user')
+        break
+
+# Close the serial connection when done
+ser.close()