Add arduino code

Arduino/rx_speed/rx_speed.ino

@@ -0,0 +1,49 @@
+#include "SerialTransfer.h"
+
+SerialTransfer transfer;
+
+const byte OC1A_PIN = 9;
+const byte OC1B_PIN = 10;
+
+const word PWM_FREQ_HZ = 25000; //Adjust this value to adjust the frequency (Frequency in HZ!) (Set currently to 25kHZ)
+const word TCNT1_TOP = 16000000/(2*PWM_FREQ_HZ);
+
+void setup() {
+  // Setup Serial transfer with PC
+  Serial.begin(115200);
+  transfer.begin(Serial);
+  
+  pinMode(OC1A_PIN, OUTPUT);
+
+  // Clear Timer1 control and count registers
+  TCCR1A = 0;
+  TCCR1B = 0;
+  TCNT1  = 0;
+
+  // Set Timer1 configuration
+  // COM1A(1:0) = 0b10   (Output A clear rising/set falling)
+  // COM1B(1:0) = 0b00   (Output B normal operation)
+  // WGM(13:10) = 0b1010 (Phase correct PWM)
+  // ICNC1      = 0b0    (Input capture noise canceler disabled)
+  // ICES1      = 0b0    (Input capture edge select disabled)
+  // CS(12:10)  = 0b001  (Input clock select = clock/1)
+  
+  TCCR1A |= (1 << COM1A1) | (1 << WGM11);
+  TCCR1B |= (1 << WGM13) | (1 << CS10);
+  ICR1 = TCNT1_TOP;
+}
+
+void loop() {
+  if(myTransfer.available())
+  {
+    // send all received data back to Python
+    for(uint16_t i=0; i < myTransfer.bytesRead; i++)
+      myTransfer.packet.txBuff[i] = myTransfer.packet.rxBuff[i];
+    
+    myTransfer.sendData(myTransfer.bytesRead);
+  }
+}
+
+void setPwmDuty(byte duty) {
+  OCR1A = (word) (duty*TCNT1_TOP)/100;
+}