The Automatic Windshield Wiper system senses the amount of rain on the windshield and sets the wiper speed accordingly. Manual controls are also available using DIP switches (see demo in flash version).

Servo Motor: Used to move the wiper
      Controlled using Test Point 31

HD44780-Based LCD: Displays mode, voltage across metal-tape switch, wiper-speed setting, and a weather condition animation (a sun or rain drops)
     Controlled using Test Points 30-28 and Bi-directional Test Points 27-20

Metal-tape Switch: In the shape of a spiral to allow more surface area for water drops to close the circuit
     Connected through the ACD in series

1) Correct timing for LCD writes

2) Correct ordering of LCD data bus connection

3) Servo pulse control (software vs. hardware pulse generation)

• Video of the wiper in action (2.77MB)
• Video of the LCD in action (1.05MB)
• For demos visit flash version (1.78MB)