SteamyTea Posted January 24, 2017 Share Posted January 24, 2017 (edited) Does anyone know of a cheap way to do this with a Raspberry Pi. All I want to know is when a pump is on or off, I don't need to know the current or the voltage. I am thinking that I could use a contactor, wired in parallel with the pump, and just sense when it is closed with a GPIO ports/pin. It would be nicer to use a non-invasive method such as a CT clamp, but not too sure how to set that up as a simple detector. Thoughts anyone? Edited January 24, 2017 by SteamyTea Link to comment Share on other sites More sharing options...
Guest Alphonsox Posted January 24, 2017 Share Posted January 24, 2017 How about a neon or LED across the switched supply and a light sensor ? Link to comment Share on other sites More sharing options...
SteamyTea Posted January 24, 2017 Author Share Posted January 24, 2017 I had thought of that, but I can get a relay for a tenner, and it should be pretty easy to wire in (not actually seen the pump yet). An alternative is a small PSU that can drop down to 3VDC and sense that voltage. Not sure how to wire it into the Raspberry Pi as it will not be the same as the unit powering the Raspberry Pi. Maybe connect all the neutrals together. Link to comment Share on other sites More sharing options...
Onoff Posted January 24, 2017 Share Posted January 24, 2017 http://m.ebay.co.uk/itm/142228782611?_trksid=p2141725.m3641.l6368 Link to comment Share on other sites More sharing options...
SteamyTea Posted January 24, 2017 Author Share Posted January 24, 2017 Oh, that looks useful, thanks. Link to comment Share on other sites More sharing options...
Steptoe Posted January 24, 2017 Share Posted January 24, 2017 You could alternatively for a flow sensor on the pipework , ? Link to comment Share on other sites More sharing options...
Guest Alphonsox Posted January 24, 2017 Share Posted January 24, 2017 1 hour ago, Steptoe said: You could alternatively for a flow sensor on the pipework , ? Just pointed Terry at one of these on another thread http://www.ebay.co.uk/itm/Flowmeter-Switch-Pulsed-Water-Beer-Flow-Meter-Sensor-1-2-/400713718471?hash=item5d4c661ac7:g:WkUAAOSwNSxVRftI Should directly interface to the Pi GPIO Link to comment Share on other sites More sharing options...
Steptoe Posted January 24, 2017 Share Posted January 24, 2017 45 minutes ago, Alphonsox said: Just pointed Terry at one of these on another thread http://www.ebay.co.uk/itm/Flowmeter-Switch-Pulsed-Water-Beer-Flow-Meter-Sensor-1-2-/400713718471?hash=item5d4c661ac7:g:WkUAAOSwNSxVRftI Should directly interface to the Pi GPIO It would indeed, Good find, Link to comment Share on other sites More sharing options...
PeterW Posted January 24, 2017 Share Posted January 24, 2017 Just check its WRAS compliant as it may be food safe but that won't count ..! But as @JSHarris says, will they check ..?! Link to comment Share on other sites More sharing options...
TerryE Posted January 25, 2017 Share Posted January 25, 2017 Why not just an accelerometer to detect the vibration / hum whilst running. Then you don't need to touch the mains voltage. Link to comment Share on other sites More sharing options...
Steptoe Posted January 25, 2017 Share Posted January 25, 2017 Thought about this, The easiest way would simply be a relay wired I'm parallel to the pump, with the outputs going to the RPi GPIO That's the simpilest method, and no complicates code or anything else for the Pi Exactly as you said in the OP @SteamyTea Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now