MicroSquirt.com read only forum (Jan.15,2018)

Can the IPS022G that controls the FIDLE on the MicroSquirt drive a PWM idle valve directly, or do I need to make an external board using a TIP122 or something similar.

Its a 3 wire Toyota 4AGE silvertop idle valve, it has 2 coils, one to open the valve, and another to close the valve. Each coil has between 17 and 28 Ohm according to the manual. I plan to ground the wire that goes to the coil that closes the valve, and connect FIDLE to the other coil.

Yes, you can. From the wiring section of the manual:

This is the output for controlling an ON/OFF style FIdle or a PWM style IAC.

Thanks!

However, it's only a single output, so you can't drive a Bosch or Denso three wire rotary solenoid valve without resorting to the "resistor on the closing coil" hack originally developed for MS1/Extra, or an external solution consisting of an inverting stage plus a high current driver for the other coil.

I have a board for MegaSquirt that implements this, but it would be difficult to put it into the MicroSquirt case. You would only need one high current driver, so this board is a bit of overkill.

It should be possible to repurpose one of the LED output drivers to be the inverse of the FIDLE output, but that would take a code change. The LED drivers use the same circuit as the FIDLE and fuel pump drivers, so they will handle the current.

--Glen