Motors out of sequence?
Mar 13, 2019
Problem solved! After close examination of some pictures of the wiring of the motor drivers to the Arduino shield, it appeared that my wiring was 2 positions displaced. After further checking I rewired so that instead of using MARKED pins 2 to 13 I used MARKED pins 0 to 11. After that all motors responded correctly. So I assume that the shield I purchased had incorrect marking. Buyer beware!