Here are more details of my development enviroment: I plan to power the RC with a 3.6V CR2 lithum battery. I can make the ATtiny85 blink with that voltage. The board is currently powered by 2 AA NiMH batteries that are currently at 2.6V. Here are the schematics and the board design for the remote controller: I can make the LED blink and also can read the buttons without problems. I think I've messed up with the pin names. I put a scope on ATtiny85 pin 6 (PB1) but I don't see anything being transmitted.
The major one seem to be that when I add the VirtualWire include, my sketch seems to slow down a lot. Now, when I tried to replace the ATMega328 transmitter with a smaller version using the ATtiny85, I'm having problems. Both modules talk to each other will very little data drop out. I have build ATMega328 versions of the receiver and transmitter using VirtualWire without any major problems. I've found a few scattered sources of information on the Net about it, but couldn't make much sense of it. So, before I go any further, is it possible to use VirtualWire with ATtiny85 running at 3.6V and 8MHz with its internal oscillator? If so, how? I'm trying to make an RF remote control using ATtiny85 running at 8MHz on internal oscillator, this cheap RF 434MHz transmitter module (like the one below), and VirtualWire lib, but had no success so far.
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