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https://github.com/chrisb2/water-system

This project uses weather API's to determine if significant rain has fallen in the last day, or is forecast today, and if so disables the garden watering system to conserve water.
https://github.com/chrisb2/water-system

esp32 micropython thingspeak

Last synced: 2 months ago
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This project uses weather API's to determine if significant rain has fallen in the last day, or is forecast today, and if so disables the garden watering system to conserve water.

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README 

        
# Garden Watering System Controller



This [MicroPython](http://micropython.org/) project on an [ESP32-C3](https://en.wikipedia.org/wiki/ESP32) ([SeeedStudio Xiao](https://www.seeedstudio.com/Seeed-XIAO-ESP32C3-p-5431.html)) uses weather API's to determine if significant rain has fallen in the last day, or is forecast today, and if so disables the garden watering system to conserve water. It reports the rainfall and system status to [ThingSpeak](https://thingspeak.com).



The project is run off a single 3.3V 1600mAh LiFePO4 battery (18650) and uses the

deep sleep mode of the ESP32-C3 to extend the battery life.



This controller is suitable for use with automatic watering systems which expose

the ability to disable the system by making a connection open circuit.



## MicroPython



The current release of firmware for the ESP32-C3; v1.9.1, does not support deep sleep.

I built my own firmware using v4.4.3 of the ESP-IDF and the v1.9.1 tag of the Micropython

with patch [esp32c3_wakeup_ext.patch](esp32c3_wakeup_ext.patch) (from [modmachine: Implemented GPIO wake-up for ESP32-C3](https://github.com/micropython/micropython/pull/9583)) applied.



## Schematic



If the schematic appears to be missing details, download it and view it locally,

or zoom the web page.



![Circuit Schematic](./schematic-garden-watering-controller.svg)



## Container



I used a polycarbonate box with a build-in O-ring seal. A

[PTFE breathable vent](https://www.aliexpress.com/store/1823522)

was fitted to allow air, but not water vapor in and out. The electrical

connections exiting the container to the watering system must be completely

sealed.



## Weather API's



All weather API calls and rain calculations are in _weather.py_, you will need

to update the services called and the code used to extract data from the

responses.



## Usage



Configure a ThingSpeak channel something like:



![ThingSpeak channel](https://github.com/chrisb2/water-system/raw/master/thingspeak-settings.png "ThingSpeak Channel Settings")



Download the library:

* [urtc](https://raw.githubusercontent.com/chrisb2/Adafruit-uRTC/master/urtc.py) real time clock (RTC) library.



Create a file called _secrets.py_ and fill in appropriate values:

```python

"""Secret values required to connect to services."""

WIFI_SSID = 'XXXXXX'

WIFI_PASSPHRASE = 'XXXXXX'

THINGSPEAK_API_KEY = 'XXXXXX'



HEADER = {'User-Agent': 'XXXX'}

LOCATION = 'lat=-XX.XXX&lon=YYY.YYY'

```

By default the RTC will wake the ESP32-C3 from deep sleep at 5am GMT every day, if

you want a different time edit the value of the _RTC_ALARM_ constant in

_config.py_.



Copy all the python files to the ESP32-C3.



Set the 'No Sleep' DIP switch to 'on', press the RST button to reset the ESP32-C3,

then connect using Putty or similar serial client and initialize the RTC by executing the following:

```python

import wifi

import clock



wifi.connect()

clock.initialize_rtc_from_ntp()



# Get date time, to verify setting.

clock.timestamp()

```

Set the 'No Sleep' DIP switch to 'off', press the RST button to reset the ESP32-C3 and connect to your water system.



## Retrieve System Log

Connect using Putty or similar serial client:

```

import water_system as w

w.init_ftp()

```

Then retrieve the log file using the ip address from above:

```

curl -v -O "ftp:///system.log"

```