Spektrum Sequencer Example 1:
Example 1: Clamshell Thrust Reverser
The following is an example of a se- quencer that could be used with mixes for an aircraft model with thrust reversing. Once the model has landed the pilot would toggle a desired switch. During this time the throt- tle stick control is inhibited and throttle set zero, the clamshell reversers come into posi- tion in a scale manner and then full throttle is applied effectively slowing down the mod- el and stopping it. Once the model has reached the pilot’s desired speed or the mod- el has stopped rolling forward the pilot tog- gles the switch back to its original position causing the throttle to return to zero and the clamshell reversers to their stowed position and after a short delay throttle control is re- turned to the throttle stick.
Normally sequencers make use of the Gear channel and all other Aux and X-Plus channels but in this case because we want the sequencer to control a primary channel (throttle) mixes will be needed.
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First steps to creating a sequencer (First Screen) • From the Function List select the Se- quencer Menu and select any available se- quencer. For this example case we’re going to select Sequencer #3. • Select an activating switch: for this ex-
ample we’re going to use Switch H (users can select any switch) located on the right rear corner of the radio. • The Forward “1” and the Reverse “0”
switch positions should be darkened. These se- lect the desired motion through the sequence. • Next, select the desired speed. For this example use 3 seconds for Forward and 5 for Reverse. These can be fine-tuned later. • It helps to assign unique names to both
output functions. For the thrust reverser demo, A will be for our clamshell reversers so we’ll name them “Clamshell” and “CLM” (use uppercase for best display on the 3- character name) and B will be for our throt- tle control, so a name like “Thro.Ctrl” and “CTR” would be appropriate.
• Select an available Aux or X-Plus chan-
nel for Chan A that will be the clamshell ser- vo channel. Aux5 is used here but you can use any desired channel. • In this particular sequencer we want to
use Propo as the type for both A: and B: channels. “Propo” (short for proportional) means that the servo output will move smoothly from one position to the other. “Step” means it will jump immediately to a new position.
The next screen (click on NEXT) is where we will program how and when the channels move. Since in the previous screen we set forward to switch Pos.1, I like to toggle the switch to Pos.1 causing the time marker to move along. Most importantly I know the graph I’m looking at shows what the chan- nels have done. With the switch in the “1” position and the sequencer done moving, the servo is positioned to its end state. You need to envision what you want the channels to do to arrive at that end state. Sometimes it helps to draw a picture show-
MARCH 2013
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