Pololu TReX DMC01 Only Flashes Red Light

[Oliver]

Hi Grant,

Apologies for late reply.

Attached are some pictures of the current set up.

When I give power to both the Arduino and TReX, the blue power light comes on, and the red light flashes five times and then goes to a solid red.

I have the SI on the TReX going to pin 5 on the Arduino (Uno), and SO going to pin 4. I have ground connected to ground.

I have 6x AA batteries (9V) powering the TReX, and motors connected.

I have uploaded the sketch from the link below, but get the attached response from the serial monitor (I think the person replying to the other thread was having the same unresolved issues).

Sample Arduino Code for TReX Dual Controller

I recently purchased a TReX Dual controller and I spent this evening writing some code to figure out how to interact with it via serial from my Arduino Uno. I figured that the example might be useful to others. It just sends commands to the TReX to check signature and modes. It can be used as a springboard to other commands. enjoy, -Mark /* This is code the demonstrates interaction with the TReX Dual Motor Controller from Pololu: https://www.pololu.com/product/777 Command Ref…

I am powering the Arduino with a single 9V battery.

Jumpers should be shown, but I have the BEC jumper on, learning mode/firmware upgrade off, serial/RC/Analog jumper off, and the channel mix jumper off.

If I have the channel mix jumper on, then when everything is powered up the red light will flash once per second until powered off again (ie. wont then go to a solid red).

Are there some steps I am missing in the process? Or should I be able to wire everything up, write my code and get a response? I want to make sure everything is connected and reading/writing properly before I start writing code for motor movement.

Regards,

Oliver.