{{:nomades:am_transmitter_arduinouno.jpg?800|}} /*This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/.*/ // OCR2 values for available Transmit frequencies: OCR2A/B = 8000/Ft[Khz] - 1 #define F_8MHZ 0 #define F_4MHZ 1 #define F_2666 2 #define F_2000 3 #define F_1600 4 #define F_1333 5 #define F_1143 6 #define F_1000 7 #define F_880 8 #define F_800 9 #define F_727 10 #define F_666 11 #define F_615 12 #define F_571 13 #define F_533 14 #define F_500 15 #define FRQ F_1600 //Replace OCR2 value for frequency here, if necessary #define ANTENNA_1 PD3 //Arduino Nano/Uno Pin D3 #define ANTENNA_2 PB3 //Arduino Nano/Uno Pin D11 void setup() { //Timer 2: Carrier Frequency generation TCCR2A = bit(COM2A0) + bit(COM2B0); // Toggle OC0A (Pin 11) and OC0B (Pin 3) on Compare Match bitSet(TCCR2A, WGM21); // CTC Mode TCCR2B = bit(CS20); // No clock Prescaling OCR2A = FRQ; OCR2B = FRQ; bitSet(TCCR2B, FOC2B); // Force Output Compare B; Toggle inverted //Timer 1: PWM pinMode(9, OUTPUT); TCCR1A = bit(WGM11) + bit(WGM10); //Fast PWM, 10 Bit TCCR1B = bit(WGM12) + bit(CS10); // No Prescaling TIMSK1 = bit(OCIE1A) + bit(TOIE1);// Output Compare A Match and overflow Interrupt Enable //TCCR1A += bit(COM1A0) + bit(COM1A1); //Toggle Pin 9 on compare match //ADC Settings ADMUX = bit(REFS1) + bit(REFS0); //Reference internal 1.1V ADCSRA = bit(ADEN) + bit(ADSC) + bit(ADATE); //Auto Trigger enable, free running ADCSRA += bit(ADPS2) + bit(ADPS1); //Divide by 64 -> 18.5k Sample rate DIDR0 = bit(ADC0D); } /* Overflow Interrupt*/ ISR(TIMER1_OVF_vect) { uint16_t adc = ADC; OCR1A = adc; bitSet(DDRD, ANTENNA_1); // timer 2 outputs on bitSet(DDRB, ANTENNA_2); } /* Output Compare A Match Interrupt */ ISR(TIMER1_COMPA_vect) { bitClear(DDRD, ANTENNA_1); // timer 2 outputs off bitClear(DDRB, ANTENNA_2); } void loop() {