Led Pendant Follow-up

Wray Mills, 2016-05-16, Notes

arduino, coding, computer science, gemma, led

Thank you!

I want to pass on my enthusiastic thanks for letting us provide Technology Enrichment to you and your kids!

LED Pendant Information

Here is some more information about the LED pendants your kids coded as the final project for their Elementary Computer Science class. And, if your kid did not get to complete her/his code, please send us an email so that we can setup a time you all can come by our studio at Shady Grove and Nuckols to complete the coding.

The pendant consists of three main parts: the 8x8 LED matrix display; a microcontroller (it's actually a "Gemma" microcontroller from Adafruit); and the lithium polymar (lipo) rechargeable battery. There is an "on/off" switch on the Gemma or you simply plug the battery in to start the display and unplug to stop. The battery plugs into the bottom of the microcontroller in the off-white or black receptacle. The socket for the battery is quite tight, so it may take some fingernails and pulling the white connector back and forth to ease it out of the socket. Please don't pull by the wires -- the wires will come out of the connector if they are yanked.

Gemma battery socket

On the top of the microcontroller is a micro USB receptacle which is used to transfer the code to the microcontroller (any USB connector will work to connect a laptop/desktop to the microcontroller). However, this plug does not charge the battery. See the section below if you and your kid would like to get the software necessary to refine their code or re-code their LED.

Gemma mini usb socket

You should also have a very small charger for the battery. This charger plugs into a USB port and will charge the lipo battery. There is a red light when charging and a green light that indicates the battery is fully charged.

LED Coding information

There are detailed tutorials available at adafruit if you would like to know how we constructed the pendant and all the component specifications. However, this is a quick overview to get you (re)coding the LED frame designs:

And, feel free to comment here or shoot us an email if you have ANY questions or issues.