Firmware for our FieldMill project
- Clone or downlaod and extract this repo.
- Open the project
- Use the "esp32dev -> Platform -> Build Filesystem Image" and "esp32dev -> Platform -> Upload Filesystem Image" to write the website code to the ESP
- Upload the firmware using the "esp32dev -> General -> Upload" option
The ESP32 will open an unsecured network called Field Mill for configuration. Connect to it and go to 192.168.4.1 , which will show the current sensor reading.
To change settings like wifi and mqtt go to "Setup -> Settings". If you change the wifi settings the mill will reboot for them to take effect, if it fails to connect it will re-open its own network.
The mill comes with a default calibration that I created with my calibration setup. If you want the readings to be super accurate you'll need to calibrate it again yourself, which you can only do if you can create a known reference field. For this you must be connected to a wifi network that has internet access and go to "Setup -> Calibration".
Hit the Clear button underneath the graph to remove all exsisting calibration points and start from scratch.
Apply a field and write the strength you applied into the Applied field spinner and click "add" (make sure to wait 5-10sec for the value to settle!). Do this for as many points as you want to, I did 5 positive and 5 negative plus a zero.
Hit save to store the calibration to the ESP (THE NEW CALIBRATION WILL BE LOST IF YOU DON'T DO THIS)