🌱💧 An open source DIY soil moisture sensor

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rbaron 1fbd971c4f Merge pull request #91 from rbaron/zigbee-double-reset [zb] Implement a double-reset factory resetting method		2022-12-27 19:35:36 +01:00
.devcontainer	Update github action & workflow to build nrf-connect samples	2022-11-28 19:44:41 +01:00
.github	Default PRST_ZB_SLEEP_DURATION_SEC to 60s	2022-12-24 18:37:00 +01:00
bridge	Defaults to BLE protocol version 1	2022-03-15 08:52:37 +01:00
case	high airflow case design stl and 3mf files	2022-10-10 13:16:10 -07:00
code	[zb] Implement double-reset factory resetting method	2022-12-27 19:22:01 +01:00
data/adc-moisture-estimation	Sets transmitting power to +8dB	2021-03-31 18:37:50 +02:00
experimental/rotisserie	Adds missing base.stl to experimental/rotisserie	2022-11-08 19:19:08 +01:00
flashing/pyocd	Fixed typo in readme and changed meaning of the sentence to better reflect the actual situation.	2022-10-23 19:00:57 +02:00
img	Adds img/wiki/swdpins.jpg	2021-08-08 15:31:03 +02:00
kicad	Revert "Uses a single PNP BJT in the fast discharge circuit"	2022-11-14 08:48:02 +01:00
.gitignore	Adds a simple battery monitoring circuit and analog to digital measuring.	2021-02-14 10:59:18 +01:00
README.md	Better docs	2022-12-24 10:06:35 +01:00

b-parasite

PCB front and back photo

b-parasite is an open source soil moisture and ambient temperature/humidity/light sensor.

Features

Capacitive Soil moisture sensor - see this blog post, this Twitter thread, and this post for nice resources on how they work
Air temperature and humidity sensor using a Sensirion's SHTC3
Light sensor using an ALS-PT19 phototransistor
Powered by a common CR2032 coin cell, potentially for over two years
Support for nRF52840 and nRF52833 modules
Open hardware and open source design

This repository also hosts a few different firmware samples for b-parasite.

Sample	Description	Extra Documentation
samples/ble	This is the most battle-tested and useful firmware. It periodically reads all sensors and broadcast them via Bluetooth Low Energy (BLE). It works with Home Assistant out of the box.	Docs
samples/zigbee	An experimental/educational/exploratory basic Zigbee sample built on nRF Connect + ZBOSS. It integrates with Home Assistant via ZHA or Zigbee2MQTT.	Docs
samples/blinky	The classic "Hello, world"	-
samples/soil_read_loop	Read the soil moisture sensor on a loop. Useful for experimenting and calibrating the sensor.	-

Information about how to order, assemble, build the samples, protect the sensor and flash the firmware is on the Wiki.

code/nrf-connect/ - Common library and samples, built with Nordic's nRF Connect SDK.
kicad/ - KiCad schematic, layout and fabrication files for the printed circuit board (PCB)
data/ - data for testing and sensor calibration
bridge/ - an ESPHome-based BLE-MQTT bridge
case/ - a 3D printable case

b-parasite stuck into a small plant vase

A 3D printable case model can be found in case/.

The hardware and associated design files are released under the Creative Commons CC BY-SA 4.0 license. The code is released under the MIT license.