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by buzzle
Thu May 30, 2019 12:26 pm
Forum: Automation, sensing and robotics
Topic: Detecting 250VAC voltage/current of deep well pump motor
Replies: 45
Views: 17212

Re: Detecting 250VAC voltage/current of deep well pump motor

The wall wart's output is rated for 3v3 at 2 amps. It does seem like a lot of juice to dissipate for what I'm trying to do.
by buzzle
Wed May 29, 2019 11:10 pm
Forum: Automation, sensing and robotics
Topic: Detecting 250VAC voltage/current of deep well pump motor
Replies: 45
Views: 17212

Re: Detecting 250VAC voltage/current of deep well pump motor

Thank you for the replies. I found that when I used a 110VAC to 3v3 wall wart, I would not get a LOW condition on the GPIO, even having waited several minutes after unplugging the wall wart. I'm guessing that's because there's too little load to pull the voltage down to give the GPIO LOW condition. ...
by buzzle
Tue May 28, 2019 1:44 am
Forum: Automation, sensing and robotics
Topic: Detecting 250VAC voltage/current of deep well pump motor
Replies: 45
Views: 17212

Re: Detecting 250VAC voltage/current of deep well pump motor

ericabg,

I found that I can get to 3v3 with R1: 1700 and R2: 3300.

How would I integrate the 10K pulldown resistor to ensure the RPi GPIO doesn't float when the wall wart is not powered?

Thanks!

buzz
by buzzle
Sat May 18, 2019 7:46 pm
Forum: Automation, sensing and robotics
Topic: Detecting 250VAC voltage/current of deep well pump motor
Replies: 45
Views: 17212

Re: Detecting 250VAC voltage/current of deep well pump motor

omegaman477, For my situation, just knowing that juice is flowing from the control box to my deep well pump is good enough. If the pump's not working, I'll know very quickly when I open a faucet. This happened to me a bit over a year ago. For my project, I assume that my pump is good. I just need to...
by buzzle
Sat May 18, 2019 7:42 pm
Forum: Automation, sensing and robotics
Topic: Detecting 250VAC voltage/current of deep well pump motor
Replies: 45
Views: 17212

Re: Detecting 250VAC voltage/current of deep well pump motor

Bud,

Thank you for your quick reply!

Time to order parts!

buzz
by buzzle
Fri May 17, 2019 7:33 pm
Forum: Automation, sensing and robotics
Topic: Detecting 250VAC voltage/current of deep well pump motor
Replies: 45
Views: 17212

Re: Detecting 250VAC voltage/current of deep well pump motor

post to rpi forum Hi, Bud, Thank you for this post! I have a simpler use case: I just need to know when my deep well pump cycles on and off. While my well pump runs on 220VAC, I'd prefer to source this with just one of the hot leads and the neutral, so I'm only bringing 110VAC to your invention. To ...

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