3 Wire PWM Idle Valve Support?

[shauer]

How is MS3 going to support the 3 wire PWM idle valves? Is the expansion board going to have a circuit similar to the one offered by Glenn's Garage that actively drives both sides of the valve, or is it still going to require an external fixed resistor to supply a constant load to one side?

I'm really hoping for a 3 wire driver circuit as part of the expansion board.

- Steve

Edit -

Looks like I posted to the wrong area, feel free to tow to General...

[muythaibxr]

How is MS3 going to support the 3 wire PWM idle valves? Is the expansion board going to have a circuit similar to the one offered by Glenn's Garage that actively drives both sides of the valve, or is it still going to require an external fixed resistor to supply a constant load to one side?

I'm really hoping for a 3 wire driver circuit as part of the expansion board.

There's no special circuit for 3-wire, we'll just use 2 of the medium current outputs, and drive them opposite to each other in software (using 2 PWM outputs).

Ken

[shauer]

There's no special circuit for 3-wire, we'll just use 2 of the medium current outputs, and drive them opposite to each other in software (using 2 PWM outputs).

Ken

Sounds great! A software solution to a hardware problem, I like it. Never thought of just driving two PWM outputs opposite each other.

I guess this was posted in the correct section after all.

Thanks
- Steve

[muythaibxr]

Yep, if there's no need for special hardware, then we will avoid having special hardware. That circuit would've been a special circuit specific to idle too. Now we can just use general purpose hardware for the same purpose.

Ken

[slyrye]

Sir:
I'd like to know what compiler s being use for S3 development?

[muythaibxr]

gcc.

[jsmcortina]

I added the software support for 3 wire a couple of weeks back. I have yet to try it with hardware though!

James