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audio fx sound board ACT pin
Moderators: adafruit_support_bill, adafruit

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audio fx sound board ACT pin

by zenSutherland on Wed Jun 12, 2019 9:53 pm

I have a dumb question. The ACT pin on the Audio FX Sound Board will go LOW during 'play' activity, so if I put an LED from it to +v I assume it will light up, but will it draw any current when it's not in use because there would be some voltage on both sides of the LED. I'm concerned about power usage because I'm powering the whole thing via AA Batteries, and I don't want to draw power while it's not making sound.

Thanks, I'll turn down my radio and listen for your answer. :)

zen

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Re: audio fx sound board ACT pin

by adafruit_support_mike on Mon Jun 17, 2019 12:38 am

The ACT pin is what's called an 'open drain' pin.

It doesn't change from 0V to 3.3V like a standard logic pin, it changes between a high-resistance and low-resistance connection to GND.. basically equivalent to an open or closed switch.

Open-drain outputs are good for the kind of application you want, because they don't let any current through when they're shut off.

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Re: audio fx sound board ACT pin

by zenSutherland on Thu Jun 20, 2019 9:44 pm

Thanks so much Mike! Exactly what i needed!
~zen

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Please be positive and constructive with your questions and comments.