ESP8266 Community Forum

- Sat Jun 17, 2017 2:39 am #67261 Hi!
I make a PIR sensor for my HomeKit server,... when conect he circuit to my iPhone charger ( using a 3,3v regulator) te circuit works fine, but when i use a 3,3v switching power supply like this:
http://www.ebay.es/itm/AC-DC-fuente-de- ... SwzgBY030a
the PIR sensor fail, and send detection everytime...
I put a capacitor ni the power out, but dont work.
How can I solve this problem?
Thanks!

- Mon Jun 19, 2017 8:48 am #67344 Use one that is variable, set it to 5 V, and add a lineair regulator 5 V -> 3.3 V for best regulation.

- Tue Jun 20, 2017 10:38 am #67399 thanks,
I try it but don't work...

the same problem...

- Tue Jun 20, 2017 12:06 pm #67403 your problem most likely is the missing minimal load for good regulation.
Try adding a 100Ohm resistor from +3.3V to gnd, add a 100n capacitor between +3.3V and gnd at the pir sensor.
If there are still problems, it might be interference from converter to pir-sensor.
Then try shielding the converter.