🌱💧 An open source DIY soil moisture sensor

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rbaron ea4bd872bc Simple PWM-based square wave works		2021-02-11 17:59:35 +01:00
code	Simple PWM-based square wave works	2021-02-11 17:59:35 +01:00
README.md	Simple PWM-based square wave works	2021-02-11 17:59:35 +01:00
resources.md	Simple PWM-based square wave works	2021-02-11 17:59:35 +01:00

parasite

A low power soil moisture sensor based on the nRF52840.

TODO

Implement ADC; check out air/water range (using protoboard)
Figure out how to calibrate the ADC when running from different voltages, as the battery discharges
Implement deep sleep
Implement BLE advertising with moisture, battery level
Measure current in deep sleep
Measure current in operation (ADC + BLE adversiting)
Test with a range of 2-5V input. Disconnect from USB and monitor using a serial post. Use the bench power supply to power Vcc with variable voltage. DO NOT CONNECT VCC FROM THE USB-TO-SERIAL BOARD!*
Test with a coin cell
Figure out a way for people to configure the device with a custom name. Idea: BLE service (this is what my hacked xiaomi temp sensor does)
Figure out how OTA works (if at all) over BLE
Design new board using the nrf52 instead of esp32