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Thank you @Paul. That did the trick. Thank you for all you do for this community. For those who end up here with a similar question, here's how I implemented Paul's suggestion... #define EXPOSURE_TIME 100000 // duration in microseconds for LEDs to be on #define HOLE_FREQ 500000 //...

Summary My use-case is a film scanner. Film is constantly moving and, upon detecting one of the holes at the edges, I need to flash LEDs and take a picture to capture the film frame. In this use-case, the timing of each exposure should be as precise as possible. Checking elapsed micros in the...

Hi all! Love this community. I'm using a Teensy2 (old project revived) to send keystrokes from a TI-99A keyboard to my computer (Mac OSX10.10). It works fine when hooked up to Mac OSX, but when I plug the device into a Linux machine, I get repeated keystrokes. Any idea what this problem is...

HI all, Just a follow-up to describe how I solved this. It was entirely me being an idiot. 1. I had cut the power/data trace on the back of the Teensy because I thought it was important to power the Teensy with the same 5V I was powering my display with. As soon as I bridged the pads and had...

Commenting code didn't seem to help. Sorry!

Thanks, Paul! I'll definitely try the code trick. As for power, the Teensys are running off the USB power provided to them. The matrix is powered by 4x 5V @ 10A power supplies (all with common ground, and a ground connection to the Teensys) . Are you recommending that I hook up the 5V @ 10A to...

Hi all, I am using more than one Teensy 3.1 to run the VideoDisplay sketch. I'm sending video from Processing using the included movie2serial sketch. My wiring seems fine but I'm getting a weird reaction when I run more than one Teensy at a time. I've provided video below. Anybody know what...

Problem solved - it's all in the numbers I was able to get it working and in so doing realized my fault - that the wiring and number of pins are affected by one another. In my case, I had 24 rows and used all 8 pins in the end. That meant each pin was responsible for 3 rows. That meant I had...

One addition - the wiring. I have a pin connection every 4 rows, for a total of 6 pins used. That's 100 leds per strip (4 rows of 25).

Hi all, I'm using the OctoWS2811 library to send video to an LED panel (image here). I have my settings set as instructed in both the Arduino and Processing code. I have three issues, however: 1. The image is squished horizontally. 2. The image is not centered and some of it does not appear at...

Also happy to send my two "hot potato" boards.

I'm having the same problem. Went through two in two days. I cut the pads on both and everything worked fine for 3 hours or so. Then...nothing. I checked the Teensy and it was too hot to touch. Swapped it with a new one. Fine for 2 days. Then dead. In my case, I'm using the Teensy 3.1 hooked...