ESP8266 Community Forum

- Thu Mar 08, 2018 9:18 am #74467 I confirm the reply of m_elias #73027 with photo.
Just CH_PD --> +3.3v and Resistor 10k between Gpio0 and +3.3v
It run perfectly with my Arduino sketch.
Thanks a lot to m_elias for the solution.
Can be help many users.
Roberto
Italy

- Thu Mar 22, 2018 10:41 am #74813 As far as I know in these modules the ESP8266 doesn't drive the relay but there is another MCU, an 8051 in older modules, an STM8 in newer modules.
The ESP8266 act as a WiFitoSerial adapter only.

- Thu Mar 22, 2018 8:44 pm #74829

As far as I know in these modules the ESP8266 doesn't drive the relay but there is another MCU, an 8051 in older modules, an STM8 in newer modules.
The ESP8266 act as a WiFitoSerial adapter only.

Could you elaborate? The esp8266 in this case is an ESP-01 and it triggers a transistor which in turn powers the relay coil.

- Thu Mar 22, 2018 9:06 pm #74830 ESP-01 has 2 usuable GPIO, so it can shift one or the other to High or Low, which is normally enough to set a relay.
Or am I mistaken?