// Example 08B: Arduino Networked Lamp // // Copy and paste this example into an empty Arduino sketch #define SENSOR 0 #define R_LED 9 #define G_LED 10 #define B_LED 11 #define BUTTON 12 int val = 0; // variable to store the value coming from the sensor int btn = LOW; int old_btn = LOW; int state = 0; char buffer[7] ; int pointer = 0; byte inByte = 0; byte r = 0; byte g = 0; byte b = 0; void setup() { Serial.begin(9600); // open the serial port pinMode(BUTTON, INPUT); } void loop() { val = analogRead(SENSOR); // read the value from the sensor Serial.println(val); // print the value to // the serial port if (Serial.available() >0) { // read the incoming byte: inByte = Serial.read(); // If the marker's found, next 6 characters are the colour if (inByte == '#') { while (pointer < 6) { // accumulate 6 chars buffer[pointer] = Serial.read(); // store in the buffer pointer++; // move the pointer forward by 1 } // now we have the 3 numbers stored as hex numbers // we need to decode them into 3 bytes r, g and b r = hex2dec(buffer[1]) + hex2dec(buffer[0]) * 16; g = hex2dec(buffer[3]) + hex2dec(buffer[2]) * 16; b = hex2dec(buffer[5]) + hex2dec(buffer[4]) * 16; pointer = 0; // reset the pointer so we can reuse the buffer } } btn = digitalRead(BUTTON); // read input value and store it // Check if there was a transition if ((btn == HIGH) && (old_btn == LOW)){ state = 1 - state; } old_btn = btn; // val is now old, let's store it if (state == 1) { // if the lamp is on analogWrite(R_LED, r); // turn the leds on analogWrite(G_LED, g); // at the colour analogWrite(B_LED, b); // sent by the computer } else { analogWrite(R_LED, 0); // otherwise turn off analogWrite(G_LED, 0); analogWrite(B_LED, 0); } delay(100); // wait 100ms between each send } int hex2dec(byte c) { // converts one HEX character into a number if (c >= '0' && c <= '9') { return c - '0'; } else if (c >= 'A' && c <= 'F') { return c - 'A' + 10; } }