Cynic-al Posted June 14, 2016 Share Posted June 14, 2016 I bought one of these from ebay a few months ago to read rpm on the mill (I know I know). There's no wiring diagram for the display just a bit of Chinese writing (ok I know I know!). I did a bit of Internet searching and wired it up the most common way; Pin 1: +ve supply and +ve sensor Pin 2: -ve supply and -ve sensor Pin 3: Pin 4: Pin 5: signal from sensor. With pin 5 disconnected the display shows 0000 rpm and the sensor led flashes as the magnet passes. With pin 5 connected the display shows ---- and the sensor led is on permenantly. I have tried a 10k pull up resistor but it doesn't like that. I have uploaded a video here https://youtu.be/sHQyfbibadQ Any advice from electrical people? I have contacted the seller but I doubt I will get much back ad I've had it ages. Is it a dud or am I just doing something stupid. It shouldn't be this hard! Quote Link to comment Share on other sites More sharing options...
Cynic-al Posted June 14, 2016 Author Share Posted June 14, 2016 Well that was a waste of a night. Aparantly it didn't like my 12v dc bench power supply output. https://youtu.be/ccPvjga5bfM Now alive! https://youtu.be/sEsDMyqQjag Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 14, 2016 Share Posted June 14, 2016 Not really surprising looking at that trace! Quote Link to comment Share on other sites More sharing options...
Cynic-al Posted June 14, 2016 Author Share Posted June 14, 2016 I think it's nic-nakked! Annoting thing is I've wired that gauge every which way I could think of trying to get it to work, if I'd wired it straight into the mill it would've had a clean dc supply and worked first time. :/ Quote Link to comment Share on other sites More sharing options...
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