Attached is a toy minimum parts buggy made using under-arm roll-on, x2 stepper motors, ULN2803, bar-graph LED, 9V battery, 5V Reg, PICAXE-18M2 and some few caps, resistors, wires and IC headers. The perfect PICAXE chip will be 20M2, as that will simplifies design and coding.

The buggy basically avoids left and right obstacles and keeps going forward. It can sometimes get in and out of a square or rectangular maze. Issues with the touch sensing includes:

  • If the sensing is made too sensitive, buggy gets confuse and detects randomly.
  • If made less sensitive, buggy takes long to avoid or move away for obstacle.
  • If made just about right, it senses intermittently due to the nature of capacitive touch sensing.
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