ESP32 Forum

Posted: **Sun Jan 12, 2020 10:46 am**

Code: [Select all] [Expand/Collapse]

[Codebox=text file=Untitled.txt]

GeSHi © Codebox Plus Extension

[/Codebox]
Good morning everybody i am looking for help.
I have esp32 + MCP 23017 IO connected to 8 + 8 relays modules 5 v. After few hours i lose relays.
I am powering everything with a 5 v 10 amp supply. Esp32 powered on the usb plug or from vcc and gnd pins do not make any difference because in both options I lose relays. When I lose relays, IO led is on.
Thanks
A

Posted: **Mon Jan 13, 2020 5:52 pm**

What do you mean by lose relays? Do you see smoke or just its state is not kept?

Posted: **Tue Jan 14, 2020 2:57 pm**

Do you have some MOSFETs or any kind of drivers, such as ULN2803, between MCP23017 and the relays ?
Because MCP23017 output can't provide enough current (max 25mA) to drive relay's coils directly ...

ESP32 Forum

16 relays controlled by esp32 and mcp23017

16 relays controlled by esp32 and mcp23017

Re: 16 relays controlled by esp32 and mcp23017

Re: 16 relays controlled by esp32 and mcp23017