Virus

iTrader: (3)

Anyone connect an A/F meter to their Hydra ECU? Is it as simple as connecting power, ground and signal?

y8s

iTrader: (8)

not nearly that easy. maybe not even possible. you need a signal from the wideband controller (which is internal to the hydra) to send to the gauge/meter.

you'd have to set up a PWM output to provide that signal based on AFR and then convert it to a straight voltage to match the input of your meter.

Matt

airbrush1

plus the sensor that the hydra uses (for some reason) is way different than the other available sensors......

Virus

iTrader: (3)

I read this on mdac.com:

"A user defined PWM signal can also be used as a data and power source for the MDAC GP-meter 1.0. The display data is 0.256 times the duty cycle percentage. For example, to show AFR, a programmable ECU user defined PWM output would be programmed to output a 57% duty cycle at AFR = 14.7. The MDAC GP-meter 1.0 would output '14.7' based on the above equation."

I'm such a dumb-*** that I can't think of how I would take an Autometer gauge that has a range of 0~5V and make that conversion.

Al Hounos

could someone enlighten me on the actual purpose of a A/F gauge? i dont mean widebands, i mean the gauge itself.

Pitlab77

iTrader: (3)

well it its a NB o2 to make pretty lights

y8s

iTrader: (8)

RC filter. it'll filter out the frequency component and leave you with avg voltage. for example. 50% duty cycle means you're at 5V half the time. the average of that would be 2.5V.

it works because the C (capacitor) is essentially a little battery with a fast discharge rate. as the duty cycle increases, there's more on-time to charge up the cap and give it a higher charge voltage.

http://controls.ame.nd.edu/microcont...in/node40.html shows you how to build it. simple. probably can power the +12 off Vbatt depending on how tolerant the opamp is.

Matt