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First robot. Hacking up examples from everywhere and putting them together. Have discovered some neat things to share with other trying to do this. Working on the sonar obstical avoidance solution now. Throttle controlled by software or governed thru Hall sensor rpm vs what you are asking for speed. Reverse was strange to get working as it needs to get a 15ms bump forward then it goes backwards. It is from a Mad R/C 1/5 scale truck that is now discontinued. All the screws are so soft the hex heads ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/gps-guided-r-c-truck