MySensors with Atmega8(L) ?

[joaopaulo]

Hi guys,
I want to control two relays using MySensors and nRF24L01+. But I wanted to do that using a ATmega8(L), it has 8Kb of flash, instead a 32Kb from mega328 of arduino. Is that possible ?

Thanks.

[Dwalt]

@joaopaulo
There has been some success using the ATtiny85 which also has 8kbytes flash. Search the forum for ATtiny.

[axillent]

you will probably need to hack&cut a library to reduce a required flash
I would recommend you to reconsider usage of atmega8, otherwise you will need to spend a lot of time to fit any upgrade
I had such an experience. I was translating Mysensors to Atmel Studio and that allows me to fit sensors & clocks into atmega8.
But as Mysensors is under fast development it became too complicated to follow.

[joaopaulo]

@axillent Yeah, I was with this same intention to port MySensors to Atmel Studio and mega8. Anyway, I think it will be less complicated if i use the common mega328p as Arduino.

Thanks

[vikmad]

// EDIT and ADD in: ...Arduino\libraries\MySensors\drivers\AVR\DigitalIO\DigitalPin.h

    #if defined(__AVR_ATmega168__)\
    ||defined(__AVR_ATmega168P__)\
    ||defined(__AVR_ATmega8__)\
    ||defined(__AVR_ATmega328P__)
    // 168 and 328 Arduinos

// EDIT and ADD IN: ...Arduino\libraries\MySensors\drivers\AVR\DigitalWriteFast\digitalWriteFast.h

 #elif defined(ARDUINO_AVR_UNO) || defined(ARDUINO_AVR_DUEMILANOVE) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega8__) || defined(__AVR_ATmega328PB__)

// ADD to Sketch Code:

//Name conversion R.Wiersma
#define UCSR0A UCSRA
#define UDR0 UDR
#define UDRE0 UDRE
#define RXC0 RXC
#define FE0 FE
#define TIFR1 TIFR
#define WDTCSR WDTCR

#define WDIE 6
#define WDCE 4

// DISABLE debug! small memory :(
//#define MY_DEBUG

I did not test on HW, I just tried to compile it (DimmableLEDActuator):

[gregaou]

@vikmad
Impressive, the same thing will work for an attiny84/85 ?