RBBB Trouble

Forum 2005-2010 (read only) Hardware Troubleshooting
1

If anyone has any experience with the RBBB (Really Bare Bones Board), I could use your help.

I have created some code which basically runs RGB leds through various color combinations using PWM and utilizes the input from a potentiometer to vary the speed of this color change. My issue is that when I run the code through my Arduino Duemilonova, everything works fine include the potentiometer input to vary the speed. However, when I put the Atmel 168 chip into the RBBB and wire everything up, the potentiometer input seems to not work. I have tried using various analog inputs on the RBBB, and have checked my soldering (everything seems all right). Is there something different about the RBBB setup that I am simply not aware of? Or any other reason the pot may not be working with the RBBB?

2

You are taking the chip from the working arduino and putting it into the RBBB, or are you inserting a new chip? If its a new chip it might need to be flashed with the arduino bootloader. If you are moving the chip from one board to another, did you insert it the right way into the RBBB?

I have a RBBB and have never had any issues with it.

3

The Atmel168 that came with the RBBB kit came with the bootloader already flashed to it. It runs the code fine except for the pot input.

4

i checked the schematic, and they seems the same in regards of the analog input.
i got a bunch of RBBB, send me the code i will try it

5

Should work the same. Do a wiring check or better yet a continuity check with an ohm meter.

Lefty

6

Thanks for the input so far. I ordered another RBBB to put into another project I'm working on, and assembled it last night. I uploaded the RGB LED code to it, and it seems to work with the pot on this RBBB. So I guess there might be something wrong with the first RBBB I assembled.

Another issue came up though, when I run the code from my Arduino board, the shifting between colors is very smooth. When I run the same code from the RBBB board, the shifting of color seems to stall a lot (it is not smooth at all). Any ideas on this issue?

7

it could be a floating ground?
is this on your new RBBB?

8

Floating ground? As in a ground pin that is not connected to anything? One of the ground pins on the RBBB is not being used, as I only am currently using 1 to run the ground row into from the breadboard. I'll try grounding the other pin when I get home to try it out. (This might not be what you're referring to at all)

And yes, this is the new RBBB. I haven't tested the other one yet, but I imagine there could have been some problem in my assembly (though everything looks similar to the new board that I assembled).