AVR-Chat

Hi Folks,

I'm just starting this project where I'd like to use an ATtiny13 (for
cost and size reasons) to monitor an IR receiver chip.  When the
processor sees three pulses it will energize a relay.

I'll just have it sit in a loop waiting for the first pulse.  The 1st
pulse is 2000us then no pulses for 27800us, another pulse of 400us, no
pulse for 1500us then one more pulse of 400us.

I just have to detect the pulses (no data is being transmitted) so
does it look like I can use the internal osc?  This app will normally
be used at a temp of 10C to 30C.  I don't want to re-invent the wheel
so if anybody has any ideas where to start I'd appreciate it.

I've come up with two ways to attack this.  First would be to setup
the timer and actually time the pulses and second would be to just
sample the input and the midpoint of the pulses and gaps to verify
that they occurred.  Since there will only be these 3 pulses with
these timings this should simplfy matters.

What do you think?

Thanks,

Richard Cooke
Lake Forest, CA