Tag Archives: LiPo

Zero Tiny BLE – low cost and low powered embeddable board


The Zero Tiny BLE is a small low cost and low powered embeddable board with an AVR ATTiny85 microcontroller and a Bluetooth 4.0 (Bluetooth Low Energy or BLE) radio.
AVR ATTiny85 microcontroller running at 8MHz internal clock and 3.3V. ATTiny85 Datasheet.

HM-10 Bluetooth 4.0 Low Energy module. HM-10 Datasheet.
Powered by single cell 3.7V Lithium Polymer battery (LiPo) or USB B mini port.
LiPo battery recharge capabilities via the USB B mini port.
Standard UART communication over Bluetooth 4.0.
Easy prototyping via breadboard.
Use either Arduino or AVR-GCC development environments.
Small form factor of 20mm x 47mm (0.79” x 1.85”)
You can purchase a complete board at zeroengineering.io
You can order unpopulated boards from OSH Park

Zero Tiny BLE – low cost and low powered embeddable board – [Link]

Cheap USB LiPo charger notes


by Jim @ jimlaurwilliams.org:

I got a couple of cheap ($1.29) 1A USB LiPo chargers since I’m doing more and more LiPo/LiIon powered stuff. I mostly discharged a recycled 18650 cell for a test load and it looks like it does charge at nearly 1A. Two LEDs – red charging, green (mine is blue) fully charged. Seems like a pretty ideal cheap device.

Cheap USB LiPo charger notes – [Link]

Battery fuel gauge with zero parts and zero pins on AVR

Josh Levine writes:

It can be nice to know how much battery power you have. It becomes critically important with LiPo batteries since you can permanently damage them by running the voltage down too low. Typically battery voltage detection requires adding a circuit with extra parts and their associated power requirements. Wouldn’t it be great to be able to do this using nothing but software? Read on for a no parts, no pins, no power solution…


Battery fuel gauge with zero parts and zero pins on AVR – [Link]

SnapPiCam, a DIY Digital Camera


by elektor.com:

When you think Raspberry Pi and camera you probably already know the score; a small camera board that plugs into the Pi’s CSI connector fitted with a fixed-focus wide-angle lens. This versatile setup has been the basis of all sorts of homebrew applications. The SnapPiCam takes the Pi down a different route and converts it into a 5 MP digital camera with interchangeable lens.

Gregory L Holloway is the brains behind this idea, he developed it as an entry into an Instructables competition (which he won) and the response he got encouraged him to launch it on Kickstarter. The design uses the lower spec RPi A without an Ethernet port and with 256 MB of RAM. The camera includes a LiPo battery and DC-DC converter to make it truly portable and different versions allow you to add a rear touchscreen and various interchangeable, magnetic-mount lens ranging from wide-angle to telephoto zoom.

SnapPiCam, a DIY Digital Camera – [Link]

LiPo Booster


LiPo Booster –

LiPo  Booster is a breadboard-friendly boost converter board based on the TPS61230 IC from Texas Instrument. It has an output voltage of 5V, and is designed to be used with a single cell LiPo battery.

For normal and half size breadboards, the LiPo Booster can be plugged into the power rails without blocking the vertical 5-pin strips. It can also be used with a tiny breadboard or breadboard of any sizes as shown below.

LiPo Booster – [Link]

yamppPod MP3 Player


by mictronics.de:

This page is related to the yamppPod (yPod) MP3 player project of Jesper Hansen at www.yampp.com  The hardware of this player is based around an Atmel ARM7, here AT90SAM7S128 and the VLSI VS1033 MPEG3 codec. Powered by a single LiIo/LiPo battery, the player also includes a color LCD, a 5-way switch for user inputs and a TWI EEPROM to store settings. A Micro SD card slot provides access to the music and system files stored a simple Micro SD card. Recharging the battery as well as data exchange with a PC is done by the USB interface available via mini-USB connector. A 3.5mm stereo jack provides the audio signal for headphones or any kind of amplifier. And everything located on a tiny 4-layer PCB.

yamppPod MP3 Player – [Link]

Arduino Weather station


Xose Perez of Tinkerman has written an article detailing the build of his weather station:

Arduino FIO based weather station with a DHT22 temperature & humidity sensor and a BMP085 barometric pressure sensor. The whole sensor will be powered by a solar panel (doubling as irradiance sensor) and backed by a LiPo cell.


Weather station – [Link]

Demiduino, another tiny Arduino compatible board

Wade made a tiny Arduino compatible board. It has 8 Digital I/O pins, 4 Analog pins, and an on-board lipo charger.  The ATmega32U4 microcontroller has more memory than the original Arduino. [via]

Digital pins 0-7, Analog 2-5, and a RST, V+, and GND pin are broken out to two rows of pins, maintaining about half the pins in a familiar shape and organization. A JST connector for LiPo batteries like the ones available through SparkFun and Adafruit and an MCP73811/2 charger circuit makes the Demiduino well suited for portable applications. On the back, I’ve also included CR1225 clips for ~3v3 power from easy to find coin cell batteries, and a power switch to save battery life.

Demiduino, another tiny Arduino compatible board – [Link]