I had put in LEDs to confirm PWM signals were being sent (and being lazy about not adding resistors). I did not realize that could damage the board. I will remove them. Thank you!
I have tried it in mixed and non-mixed mode. When in mixed mode, the wheels turn in tandem with matched speed and direction – no variation to indicate a turn command has been received (I assume variable speed is the expected behavior if a turn command is given). When in non-mixed mode, only one side will turn (Ch1/Forward).
Is your code for an Arduino or for the Botboarduino? Here is the manual for Botboard: https://www.robotshop.com/media/files/pdf2/botboarduinomanual.pdf. I think that the pins 2-13 on the board correspond to the 2-13 pins on the processor (but not sure), and I see that the Atmega pins 9 and 10 can generate PWMs, which would match your code. However, the only documentation/code that I could find that uses the Sabertooth with the Botboard was a user showing a connection to pins 3 and 4 (at least in code, although the picture shows 2 and 3 I think) (BotBoarduino and Sabertooth). Which is even more confusing, because if the board pins do correspond to the processor, those pins do not generate PWM signals.
Can you post a picture of your setup so that I can see how you are connecting the Sabertooth and Botboarduino?
I have looked everywhere for documentation for connecting the Sabertooth to the Botboard, and for sample code. There is Lynxmotion code on Github (BotBoarduino/Examples at master · Lynxmotion/BotBoarduino · GitHub), but nothing relevant to the setup that you present for the kit I purchased. The Sabertooth documentation assumes an RC connection – not a microprocessor, so that is not helpful. Am I missing a site that has documentation?
I am obviously frustrated with not being able to get this setup after days of effort. I appreciate your help with this.