ESP8266/32 (Home Assistant 120dB Siren Switch) connected to GPIO5

Home Assistant Switch for 120dB Siren on GPIO5

• Code can compile on ESP8266/32
• Uses WiFiManager to get WiFi/MQTT info from users
• Gets auto-discovered by Home Assistant as a MQTT switch
• Web-Server/WebSockets to control alarm
• REST-API to control alarm
• 120dB Siren is connected to D1/GPIO5
• GPIO0/FLASH_BUTTON acts as "test"

Libraries Needed

platformio.ini is included, use PlatformIO and it will take care of installing the following libraries.

Library	Link
MQTT	https://github.com/256dpi/arduino-mqtt
Bounce 2	https://github.com/thomasfredericks/Bounce2
ArduinoJson	https://github.com/bblanchon/ArduinoJson
WiFiManager Develop	https://github.com/tzapu/WiFiManager/archive/development.zip
Arduino WebSockets	https://github.com/Links2004/arduinoWebSockets
UpdateUploadServer (ESP8266)	https://github.com/debsahu/DDUpdateUploadServer

Hardware

Items

1. ESP8266 (aliexpress) / ESP32 (aliexpress)
2. 120dB 12V Siren (amazon)
3. IRLB8721 N-channel MOSFET (adafruit)
4. 3S Battery (amazon)
5. B3 Charger (aliexpress)
6. Project Box (amazon)

Instructions

• Use N-channel MOSFET, exact one used here is IRLB8721: works with 12V, gate can be controlled by 3.3V signal
• Connect the gate of MOSFET to D1/GPIO5, source to GND, drain to -ve of siren, +ve of battery to +ve of siren
• Use 300k and 100k voltage divider for checking battery voltage of 3S battery