Automatic mouse button clicker with screen change detector
By Tim Salazar

This circuit automatically presses the left mouse button on and off until photoresistor sees part of the screen change to a lighter color, it restarts clicking when the screen changes back to a darker color.  It is adjustable through VR1.

schematic

diag.jpg (29354 bytes)

Parts
Vcc Power 5v DC computer power supply

photor.jpg (3415 bytes)PR1-Photoresistor

connect.jpg (2879 bytes)
Out- Quick connect
R1 Resistor 4.7K Ù found in misc. electronics
R2 Resistor 33K Ù found in misc. electronics
C1 Capacitor 100 µF found in misc. electronics
IC1 Chip 555 Timer see: alternative
VR1 Variable resistor 10K Ù found in old TV

relay.jpg (4848 bytes)
RL1 - Relay
Q1 PNP Transistor 2N2907  
PR1 Photoresistor   found in night light
RL1 Electronic Relay   found in modem
Out Quick connect Home made computer jumpers

Mouse wiring

Photoresistor Set up
mouse.jpg (34478 bytes)

sensor.jpg (6789 bytes)

Mask off around sensor, so it sees only one part of the screen.

Photos

Test board
test.jpg (35913 bytes)

 LED circuit for testing

 

test.gif (1294 bytes)

 
Completed
done1.jpg (41010 bytes)

In use
working.jpg (53534 bytes)

Alternative circuit design
not useing a 555 timer IC.

mclick2.gif (4491 bytes)

See: Led flasher circuit for parts

 

Tim Salazar 2005
InsectPhotos.net