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You are right about the timer2, sorry. Ok, I made some tests and found a workaround. It seems if using the servo library somehow disables the ISR of the DigitShield library and so the display is not updated. If i don’t use any delay() and call regularly DigitShield.isr() in my loop() the display is working. Right now I have no idea why the workaround is necessary but I can live with that. Thanks for your assistance 🙂
Unfortunately I permanently move the servo, so disabling the display is not an option. As far as i know the servo library uses only timer 1 on arduino uno, right? since the digit shield uses also timer 1 this seems to be the cause of the problem. There is some code (currently commented out) within the digit shield library for using timer 2 would that be an option? I tried to use this code path, but didn’t get it to work. Since this project is especially aimed at beginners i don’t want to use a non standard method to control the servo, but i would be glad to be able to use the digit shield also.
