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Hi, I just published a Teensy 3.2 / Audio Library / FastLED / ESP8266 project. Its a WiFi controlled, sound reactive LED lamp using 288 APA102 LEDs and the Audio Library for ADC input and FFT: http://www.instructables.com/id/DiscoJar-Sound-Reactive-Lamp-With-288-RGB-LEDs/ Source code is...

Thanks, I only need 22 khz so you are both right, latching is not needed. I was using an external MCP4822 via SPI with the Teensy 3.2 and latching was important there, but SPI was inbetween.

Hi, I was wondering if it is possible to write to both DAC outputs synchronized/latched? Otherwise the outputs will be delayed by the time it takes to call the writeAnalogOuput() method, right? I need fully synchronous outputs for x/y laser galvo control. Regards, Florian

That's why I upgraded from speakers to real galvos, the slow galvos (like the ones I used) are really cheap compared to what you get.

Here's a short video showing the project: https://youtu.be/QLwdwvleztA (It looks better to the human eye than to the camera)

I fixed this for my project by calculating the FFT on demand. See this commit: https://github.com/florianlink/Audio/commit/5d129eeff3291dd3d2ceef42ace539c81dc9990e

I tried spreading the FFT code to the 4 time slots instead of doing it in one, but most time (approx. 70 percent) is spent in the FFT arm_cfft_radix4_q15 arm function call (I measured 1.1 ms). I had a look at that function and it can't be easily split into multiple steps. Then I found the...

I created a pull request that adds the analogRef to the constructor of AudioAnalogInput: https://github.com/PaulStoffregen/Audio/pull/186

My current code writes to the DAC (for the laser, dual channel for x/y) via SPI and uses delayMicroseconds in the range of 20-40 between positions on a line and 400 microseconds for turning the laser on/off to account for the delay of the DAC and galvos to reach the specified position. So it is...

Thanks Paul, but I am a bit afraid of doing a state machine for all my drawing code, which I would need to draw stepwise in the interrupt... One simple thing I noticed is that the FFT is calculated even when the last calculation was not read by the users code. This has the advantage that the...

Thanks, the voltage devider works well! Is it better to use the INTERNAL 1.2 voltage reference instead of the DEFAULT 3.3v reference?

No, I didn't. But is it fast enough so that I can draw with the laser at the same time and play the mp3? The laser drawing is very time sensitive, like I wrote I can see the audio framework grabbing audio blocks as artifacts in the laser drawings, which is why I stop the interrupts while...

First of all, thanks for the great Audio Library and the Teensyduino experience! I upgraded my project from an Arduino Nano in a day... I'm working on a DIY Laser Projector (driving commercial laser galvos from ebay with the Teensy + DAC + some opamps for bipolar ILDA signals). Drawing text and...