Capacitive Soil Moisture Sensor

[Capacitive Soil Moisture Sensor](https://github.com/RonMcKay/capacitive-soil-moisture-sensor)
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This is a capacitive soil moisture sensor which runs with a standalone ATmega328P and utilizes the [MySensors](https://www.mysensors.org) framework.
It can however be adapted to any other framework that uses 2.4 GHz radio communication with a NRF24L01 if you upload your own code.

A short summary of the features is:
* Runs on 2 AAA batteries
* Sleeping current of 8uA (approx. 10 years of battery life under optimal conditions)
* Uses a NRF24L01 radio module for communication
* Utilizes an ATSHA204A for secure message signing
* A sensor value range of approximately 400 (from air to water)
* External 8MHz resonator for better temperature stability than the internal oscillator
* All SMD components (except the NRF24L01 radio) on one side of the pcb
* FTDI and AVR ISP connector for programming and bootloader burning
* 3D printable case

**Note: Take care w