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Thanks, MakersBox. I recently made one, but used a NodeMCU for the controller. In addition to the operations in your test code, the robot provides a WiFi access point and web server for sending it Logo commands. I had enough program memory to implement the FORWARD, BACKWARD, RIGHT, LEFT, and REPEAT commands along with defining functions (TO-END) with variable arguments. I still need to implement an expression parser and a way to store and retrieve functions in its internal SPIFFS file system similar to the way volab seems to be storing his alphabet on external SD card.