0

‘Starburst One’: Single Alphanumeric LED Display with ATtiny461A Embedded on the Back, Powered by USB

Wow this thing looks amazing! That’s a single ATtiny461A (in SOP20 package) mounted on a custom PCB that mounts to the rear of a single alphanumeric display. The text displayed – in this case, ‘I LOVE YOU’ – scrolls through one letter at a time, and is powered by USB for 5V standard. The board files and code are provided here – and this prototype was built on an Othermill with hand soldering, making this a fairly accessible – if medium difficulty – project (and it looks great!).

This is a little weekend project I made with parts I had lying around: an Atmel ATtiny461A drives an LTP-587G alphanumeric LED display. The only additional part needed is a 68 ohm current limiting resistor. Power is +5V from a USB wall adapter.

AVR-GCC source and KiCad design files are included. This is my first KiCad project: I’ve used gEDA for everything in the past, but development seems to be stagnating and it’s a pain to use on a Mac.

The PCB is the same size as the display itself. It is single-sided and requires one jumper wire to be placed. (indicated by the single trace on the back copper layer in the PCB layout.) I made one with an Othermill, using 1/32″ and 1/64″ flat endmills. Hand soldering is straightforward, but the ATtiny’s large SOP-20 package is just a bit too big for my footprint, so I had to squeeze the legs in a little bit beforehand.

The firmware displays a hard-coded message one character at a time, with short blanking periods between each so that consecutive identical characters can be distinguished. All segments are multiplexed: only one is ever lit at a time. However, because the ATtiny461A only has 15 usable I/Os (PB7 must be used for /RESET in order to use in-system programming) I tied the top two segments together. There is no apparent effect on brightness.

The code is pretty much the simplest thing that could work. No interrupts, no fancy animations, no user input. I will most likely leave this project in its current state and build a second version using an MCU capable of driving all segments, as well a brighter/larger LED module.

Read more.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 9,200+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython – Python on Microcontrollers is here!

Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Japanese word working and more in December’s issue of HackSpace magazine!

Wearables — Solder-less magic

Electronics — = != ==.

Biohacking — Finding Bliss with Anandamide

Python for Microcontrollers — sysfs is dead! long live libgpiod! libgpiod for linux & Python running hardware @circuitpython @micropython @ThePSF #Python @Adafruit #Adafruit

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.