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It's working perfectly now. Thanks for mentioning the sample code. It allowed me to start from scratch and build the rest of the code from there. I reorganized my project so the the audio Teensy is the master with all the inputs and the slave Teensy has all the outputs. That way I only have...

I read through the article and I think I understand. I think I have plenty of resistance according to the math. I may be doing it wrong though. I'm using 6V to power the Teensy. And just a reminder, these LED's are common anode. Red: 6V - 2.5V = 3.5V (left over) ==> 3.5V/.020A = 175 Ohms...

So you're saying make the button teensy the slave and the audio teensy the master and request rather than send? I'll try that. It doesn't seem like it's going to get past the initialization code though. When the audio teensy is the master it still fails right there. I'll play with it more...

Paul, I tried swapping the master/slave relationship and it behaves the same. So how do I do this?

I know. I'm using 2 Teensys. One w/ an audio board and one without. I want to use I2C to between the two Teensys.

I'm using a Teensy 3.2 w/ Audio Adapter as a slave to another Teensy 3.2. (The Teensy w/ audio board works on its own perfectly.) This is part of a much larger project but I've stripped the rest of it down to just the following. I want to press the button on the Master and Wire.write(1) and...

Ok, so I just noticed that I was using 5V instead of 3.3V. It's working now. I'm assuming that using 5V will eventually damage the LED. It's so much brighter at 5V. :) Thanks!

Thanks for the quick reply. I should have mentioned that I started out using pinMode("pin", OUTPUT) and setting the pins to HIGH. When I do that or set the pins to 256, the LED stays a dim red. It's strange because the Arduino Uno doesn't do that.

So I'm using a common anode RGB LED. I didn't intend on using anode but I ordered the wrong ones. Whatever.... So I've got it wired up correctly and I'm able to get the correct colors I want. I'm just trying to blink on and off through a series of different colors. The problem is when the...

OK, I'll use 18 and 19. Great article, thanks for the Nick Gammon link. It's a lot to take in but the code samples should help. I'm a programmer by trade. Still trying to navigate the hardware world. ;) Thanks again!

Thank you. The power supply issue is good now. So, the Teensy looks like it has 3 sets of SCL and SDA pins. Pins 18 and 19 are used by the audio adapter on the master. Am I supposed to use pins 16 and 17 or 18 and 19? I'm using pins and sockets to stack the master and audio boards so it...

So I'm using a Teensy 3.2 with Audio Adapter and I want to use another Teensy 3.2 as a slave using I2C. My first question is can I use the same power supply (4 AA's) to supply the master Teensy and then run power to the slave also? And if so which pins? My second question is for the I2C...

Ok, thanks. I think I'll use a breakout board for the LED's. Thanks for the promo reply.

So, I'm a newbie but I'm learning fast. I have a project I've put together using an Arduino Uno. It's working so now it's time to put it all together and start soldering. I chose the Teensy because it's super small and gives me extra PWM pins. And the audio board is a nice small size too. I...