- Thu Oct 18, 2018 12:08 pm
#29651
Hi all,
I'm very new to Speeduino, and was wandering through the schematics, and noticed the MOSFET drives for your Injector outputs are all inverting type buffers - switching the INJ*-CPU pin high turns on the MOSFET, and pulls the INJ-*-OUT line low (also illuminating the LED via the 680R).
Is this so the injector drives can be either PWM'd for Peak and Hold, or just on and off for Saturated (High Impedance) injectors?
Either way, just wondering about the rationale behind the inversion of logic levels between uC output and board output.
Highly tempted to build a very tiny board to suit Teensyduino 35, without requiring the adapter board...
W.
I'm very new to Speeduino, and was wandering through the schematics, and noticed the MOSFET drives for your Injector outputs are all inverting type buffers - switching the INJ*-CPU pin high turns on the MOSFET, and pulls the INJ-*-OUT line low (also illuminating the LED via the 680R).
Is this so the injector drives can be either PWM'd for Peak and Hold, or just on and off for Saturated (High Impedance) injectors?
Either way, just wondering about the rationale behind the inversion of logic levels between uC output and board output.
Highly tempted to build a very tiny board to suit Teensyduino 35, without requiring the adapter board...
W.
Last edited by w1g3y on Thu Oct 18, 2018 11:26 pm, edited 1 time in total.