Tag Archives: door bell

Gate Opening Triggered Door Bell

Background dad’s bike which has happy sat out the frount of our house for the past 6 years was stolen a couple nights ago. managed to take the bike not wake up the dog or anything.

So I starting thinking how can I set of a alarm when people open the front gate or any gate which leads to our stuff.

So pretty simple hard hack


  • Door bell
  • Magnetic Reed Switch NO (normally open)


  1. Pull apart door bell switch, the part with the button on it.
  2. locate the button
  3. solder the Magnetic Reed Switch across the button so that if the switch is ON it shorts out the button.
  4. put back together.

Pictures will follow.

For those who don’t know magnetic reed switches are things you see on doors and windows where they actually installed a real security system

Install the door bell / switch tomorrow see how it goes.


  • With the HPM door bell it only rings once and doesn’t ring again until you’ve closed the gate and reopened it.
  • Yes I know it would be much easier to secure the bike eg. not full view of the street or not locked up.
  • Need to look at adding a override device so when you come home at 3 am in the morning you don’t wake the whole house.