I have 2 systems that needs to be "synchronous" as possible, but, without wires or wireless - system must be cheap.
The user press one switch on each system at same time at begin of the time.
We are using a 11.0592MHz crystal of 20ppm and capacitors of 5%. I made some measures and after some time we get undesirable values of deviation from each system time.
Can anyone tell me if the oscillator on ATmega8 can be calibrated (we did that before on other systems with internal RC oscillator)? Does anyone have some good ideas for we get the best "synchronous" as possible systems?
Thanks in advance.