ESP32 power led start blinking at 2.2v at input Pin when 220V AC bulb on

mm_ashraf
Posts: 2
Joined: Tue Aug 06, 2019 4:16 am

ESP32 power led start blinking at 2.2v at input Pin when 220V AC bulb on

Postby mm_ashraf » Tue Aug 06, 2019 11:55 am

I have circuit connectivity for 220v status check. 220v is connected to relay module Com Pin. then this 220v is applied to power supply module AC pins, now this power supply convert 220v to 3.3v. I have connected 3.3v supply pin to ESP32 Pin25. This pin will show power level high when there is bulb or fan ON via relay module and visa versa. All system is working ok when ESP32 is power on from USB cable. When ESP32 is power off and some one ON the button of 220v bulb/fan, There is voltage level of 2.2-2.5 volts is coming on Pin 25 when I check the multi meter. and ESP32 remain off but power LED of relay module is becoming ON and ESP32 is also blinking, I also check that power levels on 3.3v ESP pin is also high or 2.2v. I have unable to identify the issue , I have changed ESP32 Pin 25 to 26 and also change power supply module . but still this strange behavior is happening with ESP32. if I disconnect pin25 from ESP , all become Normal. it means that there is issue with ESP32, as 2.2v is at pin 25 is main cause of problem. this Pin25 is input mode and I can not avoid as in normal I have to decide light status at remote side with this input. only my issue is that 25/26 PIN input voltage is creating problem in ESP32 it self.
please advise so I can get out of this issue
Attachments
ESP32-AC220v.jpg
220v AC and power supply module pic
ESP32-AC220v.jpg (80.17 KiB) Viewed 223 times

mikemoy
Posts: 345
Joined: Fri Jan 12, 2018 9:10 pm

Re: ESP32 power led start blinking at 2.2v at input Pin when 220V AC bulb on

Postby mikemoy » Sun Aug 11, 2019 1:27 pm

Can you provide a schematic of all your connections. Or at least a drawing. There is probably something back feeding power somewhere.

mm_ashraf
Posts: 2
Joined: Tue Aug 06, 2019 4:16 am

Re: ESP32 power led start blinking at 2.2v at input Pin when 220V AC bulb on

Postby mm_ashraf » Sat Aug 17, 2019 6:16 am

I have attached, diagram and code as well for further analysis and support. I will appropriate your support in this regards
Attachments
hw_timer.h
(1.14 KiB) Downloaded 3 times
Web_server_with_timeout-AC-New5-3button00.zip
(3.14 KiB) Downloaded 3 times
DrawingIOT-First-Porject-update2-source-5v2.pdf
(219.5 KiB) Downloaded 7 times

lucx325
Posts: 5
Joined: Mon Aug 12, 2019 2:29 am

Re: ESP32 power led start blinking at 2.2v at input Pin when 220V AC bulb on

Postby lucx325 » Wed Aug 21, 2019 11:36 pm

the 3.3v pin can also be used as power input, so you should check, when the bulb is on, the voltage on the ve+ of the relay., why do you use the NC(normal close) port ?

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