Originally Posted by martyp57
Hooked it all up and I get PWM readings of 2071, 1521 and 973 (forward, middle and back) with 3 position switch E which I have assigned to channel 7. I've been looking at the mixing programmmes but am hopelessly lost and don't understand even the basics such as master/slave, would the 3 position switch be the master with the 2 position switch being the slave, and how do I link the 2 position switch to the 3 position switch.
Sorry about the short post before - had to run
Master and slave have nothing to do with the switches. Master and slave refer to channels on the radio you want to control.
master is the primary channel you want to control and slave is a second chanel that is "slaved" to the master. For example, you might have a plane with 2 servos driving ailerons on two chanels. On Futaba, the aileron chanel is normally ch 1. To program the tx so both servos move in the proper directions, you would use a mix where the master was ch1 and the 'slave' was a different chanel - usually ch5 or 6. The programming mix would "slave" ch 5 to ch 1. In the programing mix you would set the direction the slave moved and how far it moved in relation to the 'master' ch1.
That mix could be turned ON or OFF or changed by turning a switch - which you cam also set in the same programing mix.
BUT thats not what you want to do
. For your task, you want the master to be OFFSET
On the slave setting, you want to set it to what ever chanel sends the signal to your auto pilot.
Offset is how far the servo will move left or right from center, when you put the selected switch in various positions.
You set the OFFSET amount under the "Rate" setting in the mix.
You need to do a seperate Program mix for each switch position.
See my first set of instructions above.
So, you need to do 3 seperate offset type mixes for the 3 position switch and 2 more for the 2 position switch. You will need to adjust the amount of offset to get the pulse width you want.
Remember that 1500 is center position on the servo or zero "offset" in the programing mix and -100 offset will be 1000 and plus 100 offset will be 2000 or I may have the plus minus reversed.
So, what you were getting above with your first try, one switch position was near 100, the middle was near 0 and the third was near -100.