“The Qduino Mini is Arduino-compatible & 100% open source, hardware and software meaning that making and programming your first circuit is a breeze. Hardware is hard, so we decided to make it a ...

The EnergyShield Arduino rechargeable battery has been created by Nightshade Electronics and has three main internal functions including a circuit to boost the battery’s nominal voltage of 3.7V ...

When the battery drops below the “fully discharged” threshold op-amp B output moves towards the positive rail, turning off T3, the LED, and the clock; and turning on NMOSFET T2 to bring R4 into ...

Learn how to create a reliable 12V battery backup circuit for routers, LED lights, or small electronics. This step-by-step ...

One of the great things about the Arduino is that it’s totally open source so you can make your own variations on it. Case in point, DIYer Johan Kanflo’s AAduino, which comes in at the size of ...

How long can you keep an Arduino circuit running on three AA batteries? With careful design, [educ8s] built a temperature sensor that lasts well over a year on a single charge of three 2250 mAH rec… ...

The circuit works by measuring the voltage across a fixed load every second until the voltage drops to less than 0.2V. ... Topics Arduino battery DIY Electronic Geek GeekDad. Read More.

What do you do if even the smallest Arduino boards (or their clones) are too big for your homebrew project? If you're Johan Kanflo, you find a way to make them even smaller. His AAduino project ...

Behind the delightfully punny name, you'll find an Arduino-compatible board the size of an AA battery. The hardware tinkerers and prototype mavens out there will invariably have stumbled across ...

The Casio SK-1 keyboard is fairly well-known in the “circuit bending” scene, where its simple internals lend themselves to modifications and tweaks to adjust the device’s output i… ...