While researching Picaxe oscillator accuracy on different chips, I found that Microchip specs on the PIC16F886( Picaxe 28X1) states that the internal oscillator is factory calibrated to +/- 1%. The following shows that most resonators are around +/- 0.5% so would a crystal and caps improve on this? I want to drive a Model Railroad turntable for about 30 seconds with at least +/- 0.5% accuracy.
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1215234838/0
I plead guilty of almost asking why sertxd would not work on a Picaxe-08 until I read the manual.
PS - I checked a Picaxe-08 and a 20m with the following code and results:
Picaxe-08 29.86,29.72,29.77,29.71 and 29.67 seconds
Picaxe-20M - 29.91,29.93,29.96,29.96 and 29.99 seconds
It seems the accuracy is more than adequate.
Al
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1215234838/0
I plead guilty of almost asking why sertxd would not work on a Picaxe-08 until I read the manual.
PS - I checked a Picaxe-08 and a 20m with the following code and results:
Code:
pause 30000
high 1
Picaxe-20M - 29.91,29.93,29.96,29.96 and 29.99 seconds
It seems the accuracy is more than adequate.
Al
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