Hello I badly need help, I need a code for esp32 to measure npk levels and a code for thingspeak cuz im trying the codes ive got but they dont show any value on the serial monitor and can I also know the proper circuit diagram (our prototype consist of esp32, rs485 transceiver module and a NPK sensor)
Without your code it is hard to tell just what you need. I have my NPK sensor working with an ESP32 and an SPI LCD display and an SD card reader/writer.
Things to look for are the wiring, the RS485 converter, and the coding itself.
The common RS485 that some tutorials use is a MAX485. You may have better luck using a MAX3485 as the MAX485 is reported to have voltage stability issues.
I'm not an expert by any means but if you post your code I can look through it.
@mewiztired1 as requested, post the code you are using.
Also tell us which RS485 module you are using. As already mentioned, you should be using a MAX3485 - or similar - 3.3V RS485 transceiver chip.
Please provide a diagram showing how you have connected the ESP32, RS485 module, NPK sensor and a power source together. Hand drawn and photographed is ok.
DO you have the user manual for your NPK sensor?
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