It s easy and it ll cost you a little money.
Sonoff door lock.
The principle of the project is i use a wifi smart switch sonoff th to connect a temperature sensor when the sensor detects the temperature in your target place is higher or lower than a value sonoff th will launch the associated smart switch sonoff sv which will control the connected door lock to open automatically.
In this video i explain how to turn a sonoff basic into a garage door opener and use it in ewelink.
Sonoff sv is a wifi 2g 3g 4g wireless smart switch that supports 5 24v power supply.
No custom firmware but some hardware modification to the.
Remote control automate monitor home devices like lights temperature and more.
Sonoff wireless wifi smart home products turn your home into a smart home at low price.
All you need is a cheap electromagnetic lock a low cost sonoff sv and a power plug.