Category Archives: Battery

M’Day: Low Power Motion Sensor Arduino Night Light…

Posted on May 13, 2012 by krazatchu

A few years back I made a motion sensitive night light as a Mother’s day gift and while it worked pretty well it really chewed out the batteries.  And as with all devices that eat batteries it eventually fell out … Continue reading →

Posted in Arduino, AVR, Battery, DIY, Electronics, Embedded, LEDs, Low power, Sensors | 1 Comment

Supply Droop: Internal Resistance is Futile…

Posted on January 28, 2012 by krazatchu

What causes a battery supply voltage to drop when the load increases? Internal resistance does, and while it’s normally around 0.2 ohms per alkaline cell, here is a bit of procedure if your keen to figuring it out yourself: Measure … Continue reading →

Posted in Battery, Electronics, How to | Leave a comment

ADC Battery Voltage: Divide, Match and Measure…

Posted on January 28, 2012 by krazatchu

While the stock Arduino isn’t particularly well geared to running from a battery source, there are times it will be useful to know the status of our battery voltage. Using the circuit on the left as well as a bit … Continue reading →

Posted in Arduino, AVR, Battery, Electronics, Embedded, Low power, Sensors | 6 Comments

Catching some ZZZs, Part 1: Interrupted Sleep

Posted on December 15, 2011 by Socialhardware

So you finished your lastest Arduino project, hooked up a 9volt battery to the VIN and stuck the whole thing into a project box. You come back a few hours later and the Arduino is not working and the battery … Continue reading →

Posted in Arduino, AVR, Battery, Electronics, Embedded, How to, Low power | 5 Comments