- Fri Jun 28, 2019 2:38 am
#82938
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?
Moderator: igrr
- Fri Jun 28, 2019 2:56 am
#82939
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.
- Fri Jun 28, 2019 3:07 am
#82940
As I wrote I have a capacitor on the +5V/GND line but it doesn't solved the problem
do you mean something else?
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?
- Fri Jun 28, 2019 3:21 am
#82941
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...
