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You have to write you own code using the library, you have to INCLUDE the library in the source code 1) follow this:...
Have you set the current on the grblShield (3x trimmers)?
This board never will be capable of implementing the 4th [independent] axis !!! Because the pin 19 & 22 on the tqfp package are input only, reserved...
Google : " windows xp sp3 standalone install "
remember: the pwm after the optocoupler is inverted
why not using an NE555 instead fof the attiny for this (and continuing to use the trimmer to regulate the speed)??...
GRBL don't support PWM natively
http://forum.arduino.cc/index.php?topic=51838.0 pin change interrupt for attiny85
Fortunately someone have already made some code to generate the PWM on the ATtiny85 for the arduino...
If the max freq is 4 Khz (as tweakie said) the pc817 can be used, but R2 have to be a 1K
:p it's the same chip (only the amount of memory change ) and in the cad one symbol is enough to make the design
I think the circuit could be something like this [ATTACH]
The ATtiny85 dont have the Input Capture feature ^^ The solution is to use the pin change interrupt + a timer to measure the lengthof the UP...
It's better to use an optoisolator, the voltage divider is not so useful But i think to make the siplest (and cheaper) circuit it's better to not...
Even the 85 it's OK (the 13 is cheaper) Yes, for this project is enough Yes for a little more code complexity it's possible to directly analyze the...
