Ir transmitter with attiny84

Other Hardware 3rd Party Boards
1

I'm trying to make a ir transmitter with a attiny 84.
I use the irtinytx library.

Do I have to change something in the irtinytx library so it works for attiny84?

The library is default set to transmit on PB1, which is not a pwm output on the attiny84.

2

You want the library from: GitHub - Arduino-IRremote/Arduino-IRremote: Infrared remote library for Arduino: send and receive infrared signals with multiple protocols. Your link appears to be specific to the ATTiny85; this link should work for anything except the '85, notably the ATTiny84.

The IR libraries do not use PWM; they use a timer interrupt to set the frequency. In either library, in the file IRremoteInt.h you'll see a number of #defines like:

#elif defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644__)
#elif defined(__AVR_ATmega8P__) || defined(__AVR_ATmega8__)
#elif defined( __AVR_ATtinyX4__ )

That's your reference for what chips the library has been configured for.

3

If pwm is not being used, why enable / disable them?

From IRremote.cpp

TIMER_ENABLE_PWM; // Enable pin 3 PWM output

From IRTinyTX.cpp

TCCR0A |= _BV(COM0B1); // Enable pin 6 (PB1) PWM output