Computing stuff tied to the physical world

Better Mousetrap

In AVR on Dec 12, 2008 at 15:48

Now that RF transmissions work better, it was a small step to create a better house usage monitor. This one supports four sensors:


Only two sensors are being used so far (all sensor inputs are identical).

Sensor #1 watches the electricity meter rotations using the SY310 sensor:


Sensor #2 is a QRD1114 which tracks a little mirror mounted on the last digit “0” of the gas meter:


The sensors were described in a previous post. Proper positioning turned out to be crucial, so there’s a fair bit of scotch tape to hold everything in place!