Re: When I remove GND from AVR µP TINY15, become very hot.



I see two things.

You need a 0.1-uF capacitor between +5V and ground. Every digital circuit
always needs this.

Is your IR emitter an LED? It needs a resistor in series with it, doesn't
it? I see an LED and a transistor with no resistance to limit the current.

Neither of these is a certain explanation of what's going wrong, but I'm
guessing that when you emit a strong IR pulse, your supply voltage drops
below 5 V and the ATtiny goes into a latchup state.


.



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