I had that problem once and it was due to a faulty capacitor on the high voltage power supply creating instability on the HV circuitry and affecting the PIR circuitry, which was odd as that itself had its own capacitors located close to the chip and the main power supply had plenty of stabilised power. Now I'm trying to stabilise a microwave motion sensor that I designed based on one of those commercially available. It's embedded in the pcb, works OK but I need to figure out how to calibrate it more easily. It depends on temperature and material of the pcb. I purchased a frequency receiver up to 6gHz and I can see the signal on the screen. So that's a good start! Sorry, got sidetracked, slightly off topic :-) -------- Original message --------From: newxito <[email protected]> Date: 21/11/2024 17:04 (GMT+00:00) To: neonixie-l <[email protected]> Subject: [neonixie-l] Re: PIR sensor got very sensitive Maybe you have to clean the trimmer resistors or there is a little bug inside, I had that problem but it was with an outside PIR :-)gregebert schrieb am Donnerstag, 21. November 2024 um 07:50:38 UTC+1:Here's a strange story....a few weeks ago, I noticed my 7971 clock was running a lot more than it was a few years ago. After some experimenting, I found out the PIR sensor is getting a lot of false triggers (no movement in room, even covering-up the sensor didn't keep it off). Turning-back the sensitivity 1/4 turn did nothing, so I put it at minimum sensitivity and it seems to stop the false triggering. It still detects motion.Anyone else see this happen ? The sensor has been in-use for about 6 years; it's one of those cheap 5V units that cost about 1 USD and worked fine for many years.
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