Timer3i INSTALLATION
If using the internal battery, install a 12V 23A type battery, OBSERVING CORRECT
POLARITY (the positive (+) battery clip is indicated on the board), and wire
the unit with a power switch accordingly as shown above.
If using an external battery, wire the unit as shown above , OBSERVING CORRECT POLARITY.
Mount the unit in your rocket WITH THE CORRECT ORIENTATION as shown above.
If you have a unit without the on-board Acceleration Switch, wire an external one accordingly.
The unit, on powerup, will evaluate the normal state of the input, and thusly determine if your configuration
is Normally Closed (pull pin, or burn wire), or Normally Open (like the on-board Acceleration Switch).
Wire the outputs. Switches in series with each pyrotechnic output is HIGHLY
RECOMMENDED. MAKE SURE THAT TIMER CHANNEL #3 IS NOT CONNECTED TO ANY PYRO (ejection charge,
Ematch for motor starting, etc)!!!!!!!!!!!! Output #3 is to be used
as an "open collector" type output; sinking current to ground upon
activation.
If you have a unit without the on-board Acceleration Switch, wire an external one accordingly. The
unit, on powerup, will evaluate the normal state of the input, and thusly determine if your configuration
is Normally Closed (pull pin, or burn wire), or Normally Open (like the on-board Acceleration Switch).
Timer3i PROGRAMMING
When power is applied to the Timer3 while the Programming Push Button is pressed, the unit is in the Program Mode.
Upon releasing the Programming Push Button, the single beeps that the unit emits indicates that Timer Channel
#1 is ready to be programmed. Momentarily pressing the Programming Push Button (<200mS) will then cause double
beeps indicates that Timer Channel #2 is ready to be programmed. Again, momentarily pressing the
Programming Push Button (<200mS) will then cause triple beeps to indicate that Timer Channel #3 is ready to be
programmed. This can be cycled through all 3 timers.
Upon selection of the timer to be programmed, press the Programming Push Button for the interval
(>=200mS) you
wish to program for that particular Timer Channel. Upon releasing the Programming
Push Button, the interval will be "beeped" out for that particular Channel.
At any time, while the unit is beeping out the Timer Channel that is ready to be programmed, the (normally
open) on-board Acceleration Switch can be momentarily shorted (or opened if configured with an external
Normally Closed Acceleration Switch) to have the unit beep out the programmed interval for all 4 Timer
Intervals, starting with #1.
Timer Channel #3's output will first be activated 200mS after initial liftoff,
and remain on for 200mS. After that, it's output will be continuously/cyclically activated after it's
programmed time interval elapses (200mS ON time).
There is no way to "disable" a Timer Channel, other than not connecting it's output.
Timer3i USAGE
When power is applied to the Timer3 while the Programming Push Button is NOT pressed, the unit is in the Operational
Mode. Upon detection of 2.1Gs of continuous acceleration for 200 mSeconds, the unit will be armed, and Timer
Channel outputs #1 and #2 will be activated after their programmed interval
elapses, measured from first detection of the 2.1G.
Channels 1 and 2's outputs will be activated for 300mS, and they can, if desired, be programmed to overlap. As
stated above, Channel 3's output is on for 200mS, and its operation is
independent of Channels 1 and 2.