This robot uses two DC motors instead of modified servos. The ADC Distance Sensor detects objects and the autonomous mode has many random delays for a jerky spider movement.
This robot was built out of a remote control spider shell. Instead of using servos for mobility, I used the spider's DC motor mechanism so the legs would still move.
The C# application has an autonomous mode. Between responses, there are random timers that give the spider a twitchy realistic attack movement.
1 x Remote Control Spider Toy
1 x EZ-Robot Complete Kit
1 x sharp gp2d05 distance sensor
Dremel or Equivalent Tool
Hot Glue Gun