Tag Archives: cr2032

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Moteino Door Monitor

Some days ago I posted about the RFM69 to MQTT gateway based on the ESP8266 I am working on. Over these days I’ve been fine tuning the gateway at the same time I was migrating one of my home sensors to Moteino: the Door Monitor. The previous version was based on an XBee radio and has been on duty for almost 3 years and a half. Real life battery time has been around 3 months for a CR2032 coin cell, which is not bad at all, but still…

Aside from using a Moteino and a RFM69 868MHz radio instead of the XBee, I have reduced the components list by moving hardware logic to software logic. This means using sleeping capabilities of both the ATMega328 and the RFM69 and coding in a clever way to reduce awake time.

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Door sensor

UPDATE: check my post about my new Moteino based door monitor.

In the past I’ve been monitoring my home door with an IP camera and the motion software in my server. Whenever something was moving in the camera range the server saves a little footage, takes a snapshot and calls a couple of scripts I use to send notifications via NMA and email.

The problem with this set up was that it had lots of false positives. Mainly due to shadows or changes in the luminosity when someone opened or closed a door in the corridor that leads to the front door. Playing with the software configuration (sensitivity, zone patterns, trying to remove luminosity bursts,…) made no significant difference. Some days 80% of the alerts were due to this type of events, and then the whole system becomes useless because you stop checking the notifications…

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