View Full Version : How to remotely monitor low-battery and heartbeart

05-17-2006, 07:03 PM
I'm trying to monitor certain events outside the house with 2 MCUs, one inside the house and the other outside. The latter will be powered by battery only, will process the inputs from three sensors, and through a Parallax-RF transmiter will alert the MCU inside the house about any anomalities.

What is the best approach monitoring from inside the house:

1. Low batteries at the remote MCU.

2. The continious presence of the remote MCU in the event that someone steals it, for example, with or without triggering the alarms.


05-17-2006, 11:12 PM
I would have the remote tell the house MCU when it's battery is low and have the remote send a signal on a schedule and if three are missed in a row consider it time to check the remote.

- Stephen

05-17-2006, 11:50 PM

The idea is correct but I'd like to have more details. Does the MCU have a command for low-battery or a signal that acts as a watchdog?