Lithium Ion 18650 Battery Capacity Checker

I created this fairly simple circuit and Arduino sketch to check the labeled capacity of Lithium Ion 18650 batteries. It could easily be adapted to other types of batteries and discharge more than one battery at a time. If you power your arduino from a computer and monitor the serial port you can obtain results as it goes along and create pretty graphs of the results. http://admw.uk/iB

The Code…
Continue Reading →

ATTiny85 PWM Solar Charge Controller

After receiving Julian’s comment on my first Arduino solar charge controller Youtube video I’ve been thinking of ways to reduce the power consumption, but after a fair bit of reading (and a bit of guessing) I’ve been able to come up with a working prototype. In the video below I look at the code, how to program ATTinys and the trade offs that come with reducing power consumption.

Continue Reading →