interValometer

The interValometer

 

Capture pictures at set intervals

 

An intervalometer is a fancy device which enables a camera to take pictures at a set interval, creating a time lapse. In fact, it is so fancy, that many popular Canon cameras do not have this basic tool built-in. There is, however, a (cheap!) remote control which can trigger the shutter release on Canon DSLRs.

Unmodified remote control
Unmodified remote control

 

Pushing the button simply connects 2 pins together, which triggers the camera. By modifying the remote, the external electronics effectively ‘push the button’.

Modified RC
Modified RC

 

Basic schematic

 

The resistors and capacitors determine all the timing: time on, time off, and the interval in between. And not too fast – both remote and camera need time to ‘see’ a change, then react.

The interval is adjusted by changing the resistor value between pin 7 and the 9V battery.

At minimum, there is a 330 ohm resistor which has an interval of 1.6 seconds. At maximum – 500k ohms – the interval is around 170 seconds.

 

Circuitry
Circuitry

 

Before assembly

 

It all fits!
It all fits!

 

This enclosure – a slightly modified transistor radio – houses and protects the electronics.

The Stardust
The Stardust

 

An added LED serves two purposes: it indicates the power is on, and also indicates the interval by blinking when a pic is taken.

Power switch and remote connector
Power switch and remote connector

 

Adjusting the tuning dial – which is now the resistor between pin 7 and 9V – selects the desired interval.

 

This time lapse demonstrates its potential.