thijsiez/techival-iot-examples

Code samples for the Capgemini Techival IoT workshop using a WEMOS S2 Mini, LOLIN RGB LED Shield, and DFRobot Capacitive Soil Moisture Sensor

Capgemini Techival IoT Workshop Examples

This repository contains some code examples showcasing a few light effects for the LOLIN RGB LED Shield based on measurements from the Capacitive Soil Moisture Sensor.
Since the sensor is capacitive, it'll detect/measure more than just wet soil. You should be able to use your finger on the sensor to test the code instead of needing a glass of water :)

• SimpleFade changes color from red to blue on all LEDs
• SimpleCircle fills the outer LED circle with green
• RgbLoop cycles through colors and changes the brightness

Arduino IDE Settings

To upload code to the WEMOS S2 Mini, the Arduino IDE should be set to the following settings under the Tools menu.

• Board: "LOLIN S2 Mini"
  • Can be found under ESP32 Arduino
• Port: "COMx (LOLIN S2 Mini)"
  • Where COMx is probably the only available option
  • If your S2 Mini doesn't show up in the list or issues arise when uploading code to the board, hold down the 0 button, press the RST button, then release the 0 button

Tips & Tricks

Calibration

Opening the Arduino IDE's Serial Monitor will show you the unitless measured values coming straight from the sensor in all these examples. You can use these values to specify the range from dry to wet. These are defined in the examples as DRY_VAL and WET_VAL, respectively.
The default values worked for me when I was writing these examples, but depending on the sensor you're using, they might not be optimal, so change them according to the Serial Monitor output.