Examples : Controlling a servo using S01 - S12
This article shows a method of controlling a servo directly from an S01 - S12 switch, without using up any of the A-M controls.
Description
The method uses the FIXED VAL control. This is a virtual control, i.e. it is does not appear in the Assign Controls screen.
Simple 2-position switched output |
--------------- | | FIXED VAL (S01*) --> | ------> |--> servo | | --------------- |
- In the Assign Servo, assign the servo to FIXED VAL (appears after AUX 4 in the control menu).
- Go to the the Servo Travel screen and select the servo
- Adjust the curve. The "curve" is actually a horizontal line representing the fixed value. Set it to the required end-point.
- Assign switch S01 - S12 (instead of "ON").
- Go to the Servo Centre screen and select the servo.
- Set the other end point by adjusting the servo centre.
This method will only provide travel from centre to one end point. To obtain full travel, use a servomix to mix two opposite FIXED VAL's as follows:
Better Version (full travel) |
--------------- | | FIXED VAL (S01*)--> | ServoMix |--> servo FIXED VAL (SO1) --> | | | | --------------- |
S01 flips between the two inputs, by making one input active and the other inactive. If one input is +100 and the other -100, the mixer outputs (0+100)=100 or (-100+0) = -100. Therefore depending on the switch position, the mixer outputs -100/+100 i.e. full travel.
Servomix set up |
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Input | Control/Mixer | Switch | Curve | Remarks |
1 | FIXED VAL | S01* | +100 | Switch flips between inputs. Make sure only one input is active (*) at any time. |
2 | FIXED VAL | S01 | -100 |
- In the Assign Servo screen, assign a Servomix.
- In the Assign Mixers screen, goto the servomix and assign two FIXED VAL inputs.
- Goto to the Servo Travel screen
- Choose the first FIXED VAL input
- Assign any switch S01 - S12, and make it active (*)
- Set the travel for the first end point.
- Repeat 4-6 for the second input. In step (5), make the switch inactive (no *).
Note any switch S02 - S12 could be substituted for S01.