Hello,

Thanks for your response,
Here is the datasheet of the sensor: https://files.seeedstudio.com/wiki/Dissolved-Oxygen-Sensor/Datasheet-Dissolved_Oxygen_Sensor.pdf

Here is the circuit of the esp32 and the TTL converter MAX485
Noting that the converter needs 5V and the sensor 12V, I used Buck ...

Hello,
Thanks for your response,
Here is the datasheet of the sensor: https://files.seeedstudio.com/wiki/Dissolved-Oxygen-Sensor/Datasheet-Dissolved_Oxygen_Sensor.pdf

Here is a simulation of the circuit connection;
I am using a TTL converter MAX 485, noting that the converter needs 5V and the ...

Hello,

I want to work with a sensor that uses Modbus as a communication protocol, to be able to use ESP32, I am using a TTL MAX485 converter.
Unfortunately the sensor is not responsing, sometimes it responds with the same request I send, sometimes it displaying nothing in the serial monitor.
Please ...