add Arduino client sketch

1 files changed, 56 insertions, 0 deletions

diff --git a/adastrip.ino b/adastrip.ino
new file mode 100644
index 0000000..916d817
--- /dev/null
+++ b/adastrip.ino
@@ -0,0 +1,56 @@
+//
+// Arduino serial-interface for controlling 1 analog led strip. The serial interface is based on the
+// Adalight protocol. The protocol is as follows:
+// [prefix][led count][checksum][red, green, blue]*
+// prefix    := 'Ada'
+// led count := number of leds - 1  (uint16_t big endian), unused in this case
+// checksum  := led count high bit XOR led count low bit XOR 0x55 (uint8_t)
+// red, green, blue := channel intensity [0-255] (uint8_t)
+//
+
+/// The prefix for start sending led-data
+static const uint8_t prefix[] = {'A', 'd', 'a'};
+
+void setup()
+{
+  // Open the serial-connection
+  Serial.begin(115200);
+  // Send 'Ada' string to host
+  Serial.print("Ada\n"); 
+}
+
+void loop() 
+{ 
+  int r, g, b;
+  // Wait for first byte of 'Ada'
+  for(int i = 0; i < sizeof(prefix); ++i) 
+  {
+    while (!Serial.available());
+    
+    // Check next byte in Magic Word
+    if(prefix[i] != Serial.read()) 
+      return;
+  }
+ 
+  // Wait for highByte, lowByte, Checksum to be available
+  while(Serial.available() < 3);
+  // Read high and low byte and the checksum
+  int highByte = Serial.read();
+  int lowByte  = Serial.read();
+  int checksum = Serial.read();
+
+  if (checksum != (highByte ^ lowByte ^ 0x55))
+  {
+    // Checksum check failed
+    return;
+  }
+  // Wait for the next color spec to be available
+  while(Serial.available() < 3);
+  // Read the color spec
+  r = Serial.read();
+  g = Serial.read();
+  b = Serial.read();
+  analogWrite(3, r);
+  analogWrite(6, g);
+  analogWrite(5, b);
+}