Using a $1 TOSLINK connector, or just a red LED, you can get optical S/PDIF digital audio output.
Optical output is useful for projects where Teensy connects to grounded equipment. There are lots of ways to simply play sounds, but the Teensy Audio Library gives you Arduino-sketch controlled synthesis, mixing, effects & filters, analysis and much more. Sketch controlled sound is most useful when you connect more hardware to Teensy & use other Arduino libraries for inputs. But often that other hardware comes with ground connections that cause audio-corrupting ground loop problems with analog audio, like the DAC pin or the audio shield. Optical S/PDIF give you perfect digital audio output for those projects!
Click "Read more" for much more detail about the S/PDIF development....
Spent a good portion of the weekend fiddling with insanely bright 10 watt RGB LEDs.
Trying to make very low-cost DMX protocol control, of course for a Burning Man project that's planning to use 150 of them!
Often I've been asked how to get synth control voltage (CV) into an analog input pin. Teensy 3.1 has 13 bits effective analog resolution, good enough for many CV applications, but the stable internal reference is only 1.2V with analogReference(INTERNAL).
This simple circuit converts the -5V to +5V CV signal range to the 0 to 1.2V ADC input range.
Edit: here's a discussion about this circuit's details and limitations (fancy opamp-based circuits can be better).
Learn how to:
Sunday, April 26th, 1-5pm
We are also looking for a couple of helpers, please contact email@example.com if interested.
I have 4 12v strands of 50 WS2801s for sale (200 Adressible RGB LEDs total). If someone is willing to swap a $100 bill for them, they're yours.
Have you ever wanted to design your own PCB from scratch? Are you curious about the design process and the tools and techniques used by pros and hackers alike? Maybe you have some experience with Eagle PCB and want to try out a free and open source design suite...
Now's the chance to learn KiCad!
"KiCad is an EDA software suite for the creation of professional schematics and printed circuit boards up to 32 copper layers with additional technical layers. KiCad runs on Windows, Linux and Apple OS X and is released under the open-source GNU GPL v2 free of charge."
Here's a few pictures of my latest project: "Power Playground." It's a PMOS/NMOS H-Bridge with FETs that can handle 3 amps or so, plus a SPI current sensor, some switches & a rotary encoder (not stuffed yet), and a 7-segment display, all controlled by a Teensy-3.1 running FreeRTOS.
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