Seeed Energy Shield

Energy Shield is a LiPo battery based power shield that keeps your project alive. It keeps its battery charged whenever an available power source exists.

Hello World

Import programTemplate_HelloWorld

this is a repository for those components which do not need hello world test code or libraries.

Last commit 18 Feb 2014 by wei zou

Library

Import programTemplate_HelloWorld

this is a repository for those components which do not need hello world test code or libraries.

Last commit 18 Feb 2014 by wei zou

Notes

Energy Shield is a LiPo battery based power shield that keeps your project alive. It keeps its battery charged whenever an available power source exists. It accepts a wide range of power sources, from common solar cells via JST connector and USB via USB port on microcontroller, to 9V and 12V DC adapters via DC Jack on your Arduino. Meanwhile it can not only provide power for your mbed project, with a standard USB port populated on the shield, it’s also capable of rescuing your mobile electric devices from dying batteries, such as mobile phone, mp3 and tablet. Energy Shield.jpg

Features

  • Accept wide range of power inputs
  • Overvoltage protection
  • 85%+ high power conversion efficiency
  • Comprehensive LEDs indicators for charging and working status

Interface

Energy Shield Interface

Hardware Config

  1. U1: ISL97516 IC, boost chip;
  2. U3: CN3065 IC, charge management chip;
  3. U4,U8: LM293D IC, dual differential comparators;
  4. Charge Indicator: it lights in charging status;
  5. Capacity Indicator: indicate the remaining life of battery;
  6. SW2 Button: check the capacity of battery;

Pins Used

  1. Vin pin: convey power from DC jack to charge battery;
  2. 5V pin: convey power from USB port to charge battery;

Other Interfaces

  1. JST socket：provided for external power sources that requires JST connector, like solar panel;
  2. Battery socket: used to hook up LiPo battery;
  3. USB port: output 5V for other devices;

Usage

1. Charge Example

You can charge the Lipo battery with massive external power sources.

9V Adaptor

If you are using a DC adaptor to supply power to your project, then 9V adaptor won't be unfamiliar to you. By connecting a 9V adapter to DC Jack of your mbed platform, you can run your project as well as charge the battery simultaneously.

Charge Using 9V Jack

Now, press down SW2. You will find the "Charge" indicator LED lights up. The other indicator "Capacity" indicates remaining power of battery. When the remaining power is below 30%, it turns red. When remaining power is between 30% - 80%, it turns yellow. Otherwise it's green. Remaining Power Indicator

2. Shield power for device

  • Supply Power For Mbed

Charge

Switch the working mode select switch to "ON". Check on the power indicator LED on mbed to see if it works appropriately.

  • Supply Power For Mobile Devices

Charge for Phone

Use the standard USB port on the shield to supply power to mobile devices.

3. Conversion Efficiency

Convert Effect

The graph above describes the conversion efficiency of boost circuit of Energy Shield. Boost circuit boosts the voltage of Lipo battery, which is typically 4.2V or 3.7V with the drop of remaining power, to 5V and supplies outward. You can find this conversion efficiency peaks when output current is around 200mA.

Resources

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