I bought the NPK sensor from Ali Express and try to test the sensor using a wiring connection and Arduino Code exactly on this website. But it is not working with my sensor.
https://lastminuteengineers.com/soil-npk-sensor-arduino-tutorial/
I think these 3 lines of code were wrong.
const byte nitro[] = {0x01,0x03, 0x00, 0x1e, 0x00, 0x01, 0xe4, 0x0c};
const byte phos[] = {0x01,0x03, 0x00, 0x1f, 0x00, 0x01, 0xb5, 0xcc};
const byte pota[] = {0x01,0x03, 0x00, 0x20, 0x00, 0x01, 0x85, 0xc0};
ต้องแก้โค้ดตรงไหนเหรอคะ ถ้าจะทำให้ Arduino อ่านค่าจาก Sensor ได้
