INTEGRATED CIRCUIT
Finally insert the IC itself.
Make sure that all the legs
go into the holder and that
the notch is facing
downwards.
OPERATION
Insert a 20mm 3v button
cell into the battery
holder with the positive
(metal case) facing
upwards. Try not to push
it too far in as it can be
stiff to remove.
The Timer should play a quick tune and chase the LED's. It will then go to sleep (shut down
to stand-by mode). In this mode it uses very little power and extends the battery life
considerably.
To set the time, press the button once for every 30 seconds required. During timing, every
30 seconds the LED's will count down (if less than 2 minutes) and the timer will beep.
When timing has finished, it will play a brief tune, flash the LED's and then go to sleep..
To cancel timing, pause until the LED's stop flashing, then press the button again. This will
cancel the timer and send it back to sleep.
The maximum length of time that can be set is 5 minutes - 10 presses.
If the unit fails to work, try the following.
•
Check LED's are in the correct way round.
•
Check IC and battery are in the correct way round.
•
Look for short circuits between pads and remove any excess solder
For further details please go to www.edutek.ltd.uk/projects
