ESP8266 Requires RST Button Press on SMPS Power-Up

sdg123
Posts: 3
Joined: Tue Nov 02, 2021 4:58 pm

ESP8266 Requires RST Button Press on SMPS Power-Up

Postby sdg123 » Thu Dec 14, 2023 9:08 pm

I am facing an issue with my SMPS-powered ESP8266 (ESP-12F) where I need to manually press the RST button on power-up for the program to execute. GPIO0, EN, and RST are pulled up with 10K ohm resistors, and GPIO15 is pulled down. Seeking advice to address this behavior. Thanks!

ESP_Sprite
Posts: 9769
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP8266 Requires RST Button Press on SMPS Power-Up

Postby ESP_Sprite » Fri Dec 15, 2023 2:09 am

- Do you have a capacitor on GPIO0, perhaps to debounce a button attached to it? If so, remove it.
- Aside from the resistor to Vcc, do you also have a capacitor to ground on the EN line? If not, add one. Something like 1uF should work.

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