This sketch is a lightweight easy to use way of deploying self-built MQTT enabled WiFi-Buttons to your smarthome! It is optimized for long-term battery usage so the ESP32 is almost 100% of the time in deepsleep, which uses only very little energy to keep the RTC hardware going.
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Hold down external button for 3 seconds. The lights should flash rapidly and after 3 seconds it should blink steadily.
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You have 2 options to flash the new firmware over the air:
- Arduino OTA (Arduino IDE and flash normally over network)
- OTA via a middle-man-webserver which provides the OTA binary
mosquitto_pub -h mosquitto -t "/ota" -m "<OTA_BINARY_URL>"mktemp -d && python3 -m http.server # Copy the OTA bin here…- <OTA_BINARY_URL> is the IP address of your notebook in your local WiFi network.
<HOSTNAME>/button sends pressed when external button got single pressed.
Status messages are sent every hour (configurable in creds.h) to <HOSTNAME>/status.
This includes the software version and battery percentage. Note that you need
to connect a voltage divider between VBAT and GND. Connect the voltage divider to a GPIO pin which
supports ADC. Please use 47k Ohm resistor or slightly more (I've tested 100k Ohm and it worked).
More resistence -> more unstable but longer battery life
- Use https://github.com/tzapu/WiFiManager for a more comfortable deployment.
- Can also ask for MQTT server settings.
- Should be triggered when holding button for 15 seconds. (This should factory reset the device)
- Add double click?
- Rename ino + build files
- Fix/Test OTA over external webserver?!
- Add documentation about integrating this into homeassistant
- Send battery level and software version over MQTT
- ESP32 internal temperature?