Hey Fred,
I have the minimum speed trim pot set to max and it is just out of the adjustment range.
I'm getting 7.87 Vdc from S0 to S2 when it should be 10 vdc to come to a stop. I'm thinking if I add additional resistance to the S2 to S1 line it would send more to the brake (S0). The side effect is that the top speed would decrease.
I'm wondering if I go to a higher resistance overall pot like a 50 ohm would overcome the lower end resistance. It may reduce my resolution but it should get the motor to stop. and if I use a 256 byte SPI digital pot it would get some of the resolution back for the useable range.
Anyone know of a digital pot that works on a 5V supply, 256 byte, 20-50ohm resistance, that has a 10 vdc voltage cutoff?