Widget running on the smell of a single AA

For the next version of the widget, I’m planning to have an on board boost regulator. This design will allows the widget to run from just about any voltage source as low as 0.7v (so NiMh will be fine) and up to 5.5v, this boost regulator in conjunction with a standard LDO regulator will give me a nice input voltage range of 0.7v – 12V. Before I finalise the design I wanted to test things to see how well it’ll work.
Continue reading “Widget running on the smell of a single AA”

Simple Low Pass Noise Filter

The other day while playing around with the ADC on the widget I had some problems with noise causing the reading to bounce around, It needed some form filtering to remove the noise. Normally almost everyone seems to take a number of readings and then average the result, unfortunately this takes time.
Continue reading “Simple Low Pass Noise Filter”

Widget Sensor Housings

I want to deploy widgets around the home, both inside and out, so I needed to find something that would allow some protection from the environment to the electronics, cheaply and easily.

On the weekend while doing some shopping I found the solution in the kitchen area of the local discount store, at $1.50 a piece it was the right fit for the job. They probably won’t like U/V in the long run, but will see how they go, at that price I can replace cheaply.
Continue reading “Widget Sensor Housings”

Reading Widget Battery Voltage

In my previous blog entry I described adding a solar cell to the widget and how I could measure the voltage produced by the Solar Cell, however I still need to monitor actual battery voltage easily, and preferably with not a lot of additional hardware.
Continue reading “Reading Widget Battery Voltage”

Solar Powered Widget

 Solar Powered Widget board

One of the tasks I want to use the widget boards for is a Wireless Sensor Network around the house for measuring environmental values. The sensors that I want to live outdoors will need to be self sufficient in terms of power, so I wanted to see if I could charge the batteries via solar, of course this can be done, but again I want to do it as cheaply and as simply as possible, I also want the widget board to monitor the solar voltage and report it back.

Continue reading “Solar Powered Widget”