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Can't eliminate false positives on my PIR sensor.
Posted:
Fri Jun 28, 2019 2:38 amby sblantipodi
Guys is there a way to reduce false positive on a sr501 pir? I tried by adding a 1000uf capacitor on the +5vcc and ground but it doesn't helped. Using a D1 mini board here. I tried with a 100ohm pull up resistor between gpio and 3.3V but with this pull up the pir is always on. Any suggestions?
Re: Can't eliminate false positives on my PIR sensor.
Posted:
Fri Jun 28, 2019 2:56 amby Pablo2048
Maybe the false positives are not because LF noise but HF - try to connect 10nF/68nF/100nF ceramic capacitor in parallel, or try to use some EMI filter in SR power path.
Re: Can't eliminate false positives on my PIR sensor.
Posted:
Fri Jun 28, 2019 3:07 amby sblantipodi
Pablo2048 wrote:Maybe the false positives are not because LF noise but HF - try to connect 10nF/68nF/100nF ceramic capacitor in parallel, or try to use some EMI filter in SR power path.
As I wrote I have a capacitor on the +5V/GND line but it doesn't solved the problem
do you mean something else?
Re: Can't eliminate false positives on my PIR sensor.
Posted:
Fri Jun 28, 2019 3:21 amby Pablo2048
As I wrote - maybe it's not LF noise problem - your 1G capacitor didn't work as an filter in HF noise, but only in LF...