Eggtimer Rocketry Eggtimer User Manual page 22

G CHB Mode (0-Off, 1-Igniter, 2-Servo CCW, 3-Servo CW,
H CHB On-Time <1-9, 0-Cont.> {only if CHB Enable =1, 4, 5, or 6}
H Servo PWM <0-9> {only if CHB Enable = 2 or 3}
This setting controls the Channel B deployment channel. When set to "0", the channel is turned
off, so the other settings don't matter. When set to 1-3, the deployment channel turns on at nose-
over, 1 second after apogee. If this setting is 2 or 3, the deployment channel sends out pulses
that can control standard analog hobby servos. The amount of servo rotation is controlled by the
Servo Skew value, each tick changes the servo pulse width (nominally 1.5 ms) by plus-minus
100 microseconds, so the total possible range of servo pulse width is .5 to 2.5 ms. The servo
pulses are sent for 3 seconds after deployment, this value is not configurable but is more than
adequate for even the slowest servos.
If CHB Mode is set to 4 or 5, the channel is used for airstarts. Channel B will fire on the way UP
after LDA has been reached AND the Burn Timer AND Airstart Delay timers expire. If you set
CHB to 4, it also requires that the Breakwire must have been tripped as well. See Appendix D
for more information on airstarts. WE STRONGLY RECOMMEND THAT YOU RUN A
SOFTWARE SIMULATION ON ANY AIRSTART CONFIGURATION BEFORE SETTING
THE AIRSTART DELAY VALUE.
If CHB Mode is set to 6, CHB emulates the delay charge on a typical motor, i.e. it fires after a
pre-set delay time after motor burnout, regardless of other flight events. See the discussion of
the Airstart/Delay setting for more information.
The effect of the settings are:
CHB Enable
0
1
1
4
4
5
5
4-Airstart, 5-Airstart w/o Breakwire,6-Delay)
CHB On Time
n/a
1-9 secs
0
1-9 secs
0
1-9 secs
0
Deployment Channel OFF
Deployment channel activated at Nose-Over
for CHB-ON seconds
Deployment channel activated at Nose-Over
and held on continuously until Reset
Deployment channel activated after expiration
of Burn Timer/Airstart Delay for CHB-ON
seconds, IF the breakwire has been tripped
Deployment channel activated after expiration
of Burn Timer/Airstart Delay and held on
continuously until Reset, IF the breakwire has
been tripped
Deployment channel activated after expiration
of Burn Timer/Airstart Delay for CHB-ON
seconds (see Airstart discussion)
Deployment channel activated after expiration
of Burn Timer/Airstart Delay and held on
continuously until Reset (see Airstart discussion)
- 22 -