Overview
Description
The Smart Moisture Sensor reference design uses the RL78/G11 MCU's moisture sensor to measure the conditions of soil and transfer the data to a smartphone app via an RL78/G1D Bluetooth Low Energy (LE) module which can be graphically shown. For example, the app can provide a moisture vs. temperature graph. Additionally, the Smart Moisture Sensor can control a water valve by outputting a motor signal. The system also includes a buzzer to warn users if the soil becomes too dry.
Features
- Includes an oscillator that facilitates the low-power capabilities of the Bluetooth module
- A blue LED indicates Bluetooth LE operation
- Smartphone app available to communicate with the Smart Moisture Sensor via its built-in Bluetooth module
- UART and I2C connections allow alternative communication methods with the RL78/G11 MCU
- Debugger connections to program the device
- Power to the device is controlled by the RL78/G11
- 6-pin header allows for different types of motors to be controlled
- Moisture sensor consists of two contacts (one on each side of the prong) that measure the resistance of the surrounding soil
- Specify and configure automatic watering mode
- SMS hardware is powered by a single AA battery
Applications
Design & Development
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