On Mon, Aug 7, 2017 at 10:41 AM, <tu...@posteo.de> wrote: > Hi, > > > On 08/06 07:04, R0b0t1 wrote: >> 2) You can calibrate the oscillator using instructions in this >> application note: >> http://www.atmel.com/Images/Atmel-2555-Internal-RC-Oscillator-Calibration-for-tinyAVR-and-megaAVR-Devices_ApplicationNote_AVR053.pdf. >> This process still might not get you close enough. > > I have no oscilloscope nor a frequency counter. > That is above my financial possibilities... >
I forgot to mention, one (or more) of the timers can be used as a frequency counter (in multiple ways). My searching turned up a related application note, you might want to look at the code associated with http://www.atmel.com/Images/doc2563.pdf (application note AVR054) if you want to get your ATtiny85s working.
