- Mon Sep 06, 2021 6:24 am
#92212
You need a 10K pullup to Vcc on GPIO0. Also, I tied GPIO2 and CH_EN to Vcc.
- Sat Feb 12, 2022 4:00 pm
#93637
resistors R1 and R2 were swapped on my relay board, quality issue, I soldered resistors to their correct position, It works
- Sat Feb 12, 2022 4:09 pm
#93638
The resistors R1 and R2 are on wrong possition on my board, I had 10k on mosfet gate and 2k2 on ground. I solder them on their correct position, it works fine
cool wrote:Hi
This is an older post, however I started with ESP8266 day's ago and - of course - struggled with my freshly received ESP-01S relay boards.
The suggestion to add a 10k resistor between GPIO0 and 3.3v does not work for two reasons:
- first, a 2k resistor is connected between GPIO0 and a NPN transistor base with emitter to ground
- second, a 10k resistor is connected between GPIO0 and ground
thus, a 10k resistor is not small enough to reach a "high input" level.
What worked for me was to remove R2 by simply desoldering it. On my PCB it was marked R2,
This will leave GPIO open during boot, and inspite of the remainig base connection it works.
Only disadvantage: the relay will switch on during boot until the ESP8266 programm set it low.
The resistors R1 and R2 are on wrong possition on my board, I had 10k on mosfet gate and 2k2 on ground. I solder them on their correct position, it works fine
