Power pack, charger and timer

[gajjer]

Hi all,

just finished trying out my latest project. It comprises a sealed lead acid battery, a current limited charger and a camera timer.

The right hand side of the box contains the lead acid battery. The left hand side contains the charger.

The front panel has, from top left to bottom right.

The timer/charger display.

A jack socket for connecting to the camera.

LED to indicate the camera contacts are closed

A switch to start/stop the timer

A time select switch

4mm power connections to the battery

LED to indicate timer on and power to sockets

4mm power connections

Battery power to sockets switch

Charger power on switch

4mm power connections

Fuse between battery and sockets

The time is set by a PIC microcontroller. The rotary switch selects preset times - 30,45,60,75,90,120,150,180,210,240 seconds displayed as T. Tg is the timer to go to the end of the exposure.

The battery voltage is monitored continuously, as is the battery charging current. Both are displayed on the bottom line.

After the exposure time has elapsed, the number N is incremented.

[Flying Eye]

Very tidy indeed.

You've done this sort of thing before haven't you!?

[pete_l]

Excellent stuff!

Which PIC did you use?

[gajjer]

Thanks for the comments.

The PIC is a 16F877 - because I had some. Programmed in assembler - always a joy to see what errors I can make!!

cheers

gaj