Project: Convert an inexpensive kitchen timer to a camera "intervalometer"


Introduction

The Radio Shack LCD timer is an inexpensive item that might be suitable for hacking, to convert it into a camera intervalometer.


Taking apart the hardware

Remove the 6 screws from the back plate:


(OPTIONAL) Remove the 4 screws holding the circuit board to the front button assembly.


Connect 2 wire-wrap style wires (solder in place) to the pads shown. These are the pads that connect to the 'start' button on the keypad.


(more images, including full-size high-resolution images, at my flickr page )


Proposed logic state diagram for intervalometer conversion project


Time Diagram

Buzzer_allow   -----|___________|--------------------

Buzzer         __|--|_______________________________

2pulse_wire    _____|---|___|---|____________________

Expose_button  _____|-----------|____________________

labels:          A  B   C   D   E


Description