Protect lithium polymer battery pack from over discharge.

Solar Powered LED Parking Sensor: Our garage does not have a lot of depth, and has cabinets at the end the further reduce the depth. My wife's car is just short enough to fit, but it is close. I made this sensor to simplify the process of parking, and to…

Proto - the 3D Printed BattleBot: BattleBots is one of my favorite TV shows. If you don't know what it is, in a nutshell it's a show where builders create robots to fight one another. As a fan, I have wanted to build my own for a long time. This is the 4th…

DIY Variable LED Panel (Dual Color): Improve your lighting by making an affordable DIY Rechargeable LED Panel! Equipped with Dual Color brightness adjustment, this project gives you the flexibility of adjusting your light source's white balance to match your…

Dub Siren Synth - 555 Project V2: My first dub siren build was a little over complicated. Although it worked well, you needed 3 x 9V batteries to power it which was overkill and I had to build the main circuit on a prototype board. The first video is a…

We're getting close to adding support for a new STM32F4 board to CircuitPython. This is the KittenBot Meowbit, its microbit-like at the bottom but has a display and d-pad for Microsoft Arcade games. And now it even works with CircuitPython! Stay tuned for…

Vintage Flash Clock: In my searches for interesting things, I sometimes come across vintage camera flashes and find myself always buying them. I have a draw full of old flashes and I have no idea why!I have made lamps out of them (check these ‘ibles here…

For HACKADAY PRIZE 2020 Project moved and enhanced with 2 new models.ARMACHAT, ARMAWATCH, ARMACARD:<a target="_blank" rel="noopener noreferrer" href="https://hackaday.io/project/171790-armawatch-armachat-long-range-radio-messengersAll">https://hackaday.i…

Make Your Own Oscilloscope(Mini DSO) With STC MCU Easily: This is a simple oscilloscope made with STC MCU. You can use this Mini DSO to observe waveform. Time Interval: 100us-500ms Voltage Range: 0-30V Draw Mode: Vector or Dots.

A self powered 18650 Lithium-Ion battery discharge board

The charging circuits that I design need discharged batteries. Power resistors alone are not enough because when you forget the time they will discharge to all the way to 0V and damage the batteries.…

Batteries were once heavy, awkward things, delivering only a limp amount of current for their size and weight. Thankfully, over time, technology has improved, and in 2020, we’re blessed with …

[Daniel Roibert] found a way to add cheap strain relief to JST-XH connectors, better known to hobby aircraft folks as the charging and balance connectors on lithium-polymer battery packs. His solut…

Super FAST RC Ground Effect Vehicle (Ekranoplan): You know how, during touch-down, planes hover a few feet above the ground for a while before their wheels actually hit the runway? This is not only to give the passengers a smooth landing but it is also the…

Turnigy 2200mAh 3S 20C Lipo Pack by Turnigy

The battery pack can be charged using an 18V solar panel with a maximum charging current of 5A. The charging module uses the Maximum Power Point Tracking (MPPT) method for charging the 3 cell Lithium battery pack. The output power of the battery is monitored…

International Space Station Tracker: This device will track the location of the International Space Station (ISS) in real time and continuously point to it as it orbits the Earth. It is battery powered by lithium-ion cells (recovered from an old laptop) so…