eduCCate Global Learning Portal

Lesson 1: Soil moisture sensor

Lesson 2: Authors

2.1: Applications

2.2: How the Soil moisture sensor works

2.2.1: Components

2.2.2: Power supply voltage (Vcc)

2.2.3: Analog pins

2.2.4: States

2.2.5: Schematic

2.2.6: Excitation and and measuring (states applied)

2.2.6.1: Forward current flow

2.2.6.2: No current flow

2.2.6.3: Reverse current flow

2.2.7: Sensor resistance calculation

2.3: Interpreting Soil Moisture sensor values

2.4: Software installation requirements

2.5: Parts list

2.6: Circuit schematic

2.7: Photos of completed circuit board

2.8: Electronic circuit construction for LoPy4

2.8.1: Pycom LoPy4

2.8.2: Voltage divider circuit

2.8.3: Power supply

2.8.4: DHT22 temperature and humidity sensor

2.8.5: Pololu 5V Step-Up Voltage Regulator U1V11F5

2.8.6: DS18B20 external temperature sensor

2.8.7: UART connector

2.8.8: Underboard connector pins for LoPy4 board

2.9: Electronic circuit construction for Arduino MKR Zero

2.9.1: Arduino MKR Zero

2.9.2: Soil moisture sensor

2.9.3: Underboard connector pins for Arduino board

2.10: MicroPython code for Pycom LoPy4 microcontroller

2.10.1: boot.py

2.10.2: main.py

2.10.3: pymakr.conf

2.10.4: config.py

2.10.5: dth.py

2.10.6: lora.py

2.10.7: onewire.py

2.11: Arduino code for MKR Zero

2.11.1: MKR_soil_1.ino

2.11.2: chameleon.h

2.11.3: DS18B20.h

2.12: Trouble shooting

2.12.1: Indicative circuit voltages

2.13: Housing construction

2.14: Registering a Device on The Things Network

2.15: Video tutorials