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 Arduino 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.
- Accept wide range of power inputs
- Overvoltage protection
- 85%+ high power conversion efficiency
- Comprehensive LEDs indicators for charging and working status
Power Output Specifications
Power Input Specifications via JST Connector
Working Mode Explanation
Energy shield can draw current from three different ports to charge the battery, including JST connector, USB port @ Arduino and DC jack. The voltage ranges vary as below:
When input voltage is under 6.6V, you can switch the working mode of Energy Shield between “Charge” and “ON” via the working mode select switch. In “Charge” condition, Lipo battery doesn’t output but only pull current from any existing power source. In “ON” condition, the battery gets charged as well as supplies power to the whole system.
However when input voltage exceeds 6.6V, Energy Shield is forced to enter the “Charge” mode regardless of the switch status.
U1: ISL97516 IC, boost chip;
U3: CN3065 IC, charge management chip;
U4,U8: LM293D IC, dual differential comparators;
Charge Indicator: it lights in charging status;
Capacity Indicator: indicate the remaining life of battery;
SW2 Button: check the capacity of battery;
Pins Used on Arduino
Vin pin: convey power from DC jack to charge battery;
5V pin: convey power from USB port to charge battery;
JST socket：provided for external power sources that requires JST connector, like solar panel;
Battery socket: used to hook up LiPo battery;
USB port: output 5V for other devices;
1. Charge Examples
You can charge the Lipo battery with massive external power sources. Here we show you usages of two common powersources.
1) Solar Panel
Solar panel is one of the most common green power sources we use. The typical output of one unit is around 5V. We provide lots of solar panels at our store. They are all pre-assembled with JST connencors which can seamlessly match up with Energy Shield.
Plug solar panel into JST socket on the shield as below.
NoteMake sure there is sufficient light to provide considerable current.
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.
2) 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 Arduino, you can run your project as well as charge the battery simultaneously.
2. Shield power for device
1) Supply Power For Arduino
Switch the working mode select switch to “ON”. Check on the power indicator LED on Arduino to see if it works appropriately.
2) Supply Power For Mobile Devices
Use the standard USB port on the shield to supply power to mobile devices.
3. Conversion Efficiency
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.
Help us make it better
Thank you for choosing Seeed. A couple of months ago we initiated a project to improve our documentation system. What you are looking at now is the first edition of the new documentation system. Comparing to the old one, here is the progresses that we made:
- Replaced the old documentation system with a new one that was developed from Mkdocs, a more widely used and cooler tool to develop documentation system.
- Integrated the documentation system with our official website, now you can go to Bazaar and other section like Forum and Community more conveniently.
- Reviewed and rewrote documents for hundreds of products for the system’s first edition, and will continue migrate documents from old wiki to the new one.
An easy-to-use instruction is as important as the product itself. We are expecting this new system will improve your experience when using Seeed’s products. However since this is the first edition, there are still many things need to improve, if you have any suggestions or findings, you are most welcome to submit the amended version as our contributor or give us suggestions in the survey below, Please don’t forget to leave your email address so that we can reply.