ESP 8266 and I2C between 2 ESP8266 as Maser and Slave,
Posted: Sat Oct 30, 2021 11:01 amHello,
i try the last time to connect 2x 8266 with I2C.
One as Master and one as slave.
But without result. I read so many in Web and try a lot of variations, but nothing work.
The I2C bus works fine, because i have an I2C OLED TFT or a I2C Sensor on same bus for testing.
Then I disable the TFT and the Sensor and tried only the Master and slave.
I use the ESP 8266 12F Modules on an Test PCB from Web.
So i only can see over a LED or serial print that the master Slave connection is working.
The 2 Wires SCL and SDA was correct and only 7 cm long.
Has anybody any idea what i´am doing wrong ?
I have so may tries , but Ithing i set here the link what i also tried.
There you see what I do exactly like descriped.
https://www.electronicwings.com/nodemcu ... rduino-ide
And this do not works, but on both 12F I can access a Oled TFT or a I2C Sensor.
best regards
Rainer
i try the last time to connect 2x 8266 with I2C.
One as Master and one as slave.
But without result. I read so many in Web and try a lot of variations, but nothing work.
The I2C bus works fine, because i have an I2C OLED TFT or a I2C Sensor on same bus for testing.
Then I disable the TFT and the Sensor and tried only the Master and slave.
I use the ESP 8266 12F Modules on an Test PCB from Web.
So i only can see over a LED or serial print that the master Slave connection is working.
The 2 Wires SCL and SDA was correct and only 7 cm long.
Has anybody any idea what i´am doing wrong ?
I have so may tries , but Ithing i set here the link what i also tried.
There you see what I do exactly like descriped.
https://www.electronicwings.com/nodemcu ... rduino-ide
And this do not works, but on both 12F I can access a Oled TFT or a I2C Sensor.
best regards
Rainer