Frank saw a lot of forum posts from people asking how to revive a keyboard from an old, broken laptop. Many of the answers were to the tune of “it can’t be done” or “it’s too hard”, so he set out to come up with a solution. The final result is clever controller board that works with almost all keyboards. One side of the board uses a Teensy-LC for FPC cables with up to 26 pins. The other side uses a Teensy-32 for FPC cables with up to 34 pins.
Adam Haile and Dan Ternes of Maniacal labs created Bixel, an incredible interactive LED panel.
This incredible 16×16 display features SK9822 LEDs, each with a pushbutton, and 595 shift registers soldered to a massive 500x500mm PCB. A Teensy 3.6 scans the buttons and sends the data to a Raspberry Pi 3 that drives the LEDs over a USB serial connection.
Matt Bradshaw designed and built PolyMod, a very cool, open source, polyphonic, modular digital synthesizer.
The PolyMod can operate in polyphonic (poly) mode making each module able to play multiple sounds, generating chords and harmonies.
This synth is entirely digital using a Teensy 3.6 with a Teensy Audio Shield to replicate traditional analog functions in software. This approach allows users to easily create polyphonic patches, something that can be more challenging in analog systems. This project also has the advantage of being a fairly low cost way to get into modular synthesis.
When the synth is powered up, the Teensy scans each of the module sockets and for each one detected, creates a virtual equivalent in software. When a key on the keyboard is pressed, the Teensy coverts the data to a control voltage (CV) signal, which can be connected to any of the modules to generate sound.
Current modules include an oscillator, filter, envelope, low frequency oscillator (LFO), amplifier, and noise generator.
Chris Miller made the Teensy Beats Shield, an open source, hand held, highly portable, step sequencer.
The inspiration for the project came from Chris’s desire to fill a void in open source handheld musical instruments after finding that most portable audio sequencers are expensive and completely closed sourced. Someone recommended using Teensy with its digital signal processing (DSP) capabilities – and the Teensy Beats Shield was born.This handheld synth uses a Teensy 3.6 and the SGTL5000 audio codec chip and features a 2.4″ TFT display. It
Detailed information on the project including information on how to build your own can be found on this HackaDay project page.
Code for the project is available in the teensy-beats GitHub respository.
In this project Frank uses a Teensy ++ to handle the VAIO keyboard, buttons, and LED I/O. It also replaced the control pad for the M.NT68676 video card. The Teensy also monitors the battery voltage and returns the result over the I2C bus.
The Teensy is mounted to a circiut board that Frank designed to bring out the pins. 24 of the Teensy digital I/O pins routed to the FPC connector pads and the remaining I/O pins are routed to through hole pads for connecting other devices – touch pad, video card, LEDs, and the Raspberry Pi.
This video shows the Pi-Teensy laptop in action
The code for the project, as well as a great detailed write up on the project is available in this Github repository.
Luke is a model tank enthusiast and wanted to come up with an inexpensive, open source, high quality sound source project for RC models. After going through the audio tutorial workshop he got started on the project.
The project uses a Teensy 3.2 plugged in to a carrier board. The Teensy does the processing the carrier board provides an amplifier, low-dropout regulator (LDO), SD card socket, and connections for a speaker, volume and other things needed for RC models. There are 5 RC inputs on the board that allow for control of the engine and some other auxiliary sounds.Luke detailed much of the development process on the Open Panzer forum.
Curtis Olson has developed a low cost DIY autopilot system that supports the AuraUAS autopilot flight code and firmware.
This version of the hardware is the latest in his continuing evolution of a DIY autopilot system. Each version has had improvements in both performance and features. In the latest version Curtis switched to using KiCad for the PCB layout to gain more flexibility in ordering PCBs.
The basic design of the system uses a “little” (Teensy 3.2) and “big” (PocketBeagle) working together as a distributed system. The Teensy handles all the hard real time sensor I/O tasks while the PocketBeagle does the heavy lifting – control, navigation, logging, etc.
Be sure to check out the Github page for the project for more details as well as code, PCBs files, and build instructions.