Trim and flap sensors for EMS

[ColombiaJohn]

I recently bought a new Ultralight high-wing plane with a Rotax 912 engine (100hp). I also bought the Dynon EFIS 100 and EMS 120 combo. Between the two is a Garmin 327 transponder, Icom 210 radio, and Garmin 495 GPS (we don't have XM in South America). I also got 2.25" Uma guages for RPM and airspeed. See attached photo.

I see in the product photos and manuals that the Dynon EMS can display trim and flap position. I asked the salesrep at Aircraft Spruce (where I bought my avionics) how the Dynon knows the position of my flap and trim, and he mentioned something about buying sensors but he didn't have any details.

I have a RAC trim servo with an indicator on my dashboard and trim switch on my stick. There is also a servo that runs the flaps.

Does anyone know what kind of sensors I need to be able to display my trim and flap position on the Dynon EMS, just like in the glossy brochure? And where can I buy these sensors?

Thanks

 

[DBRV10]

Gooday John

The Ray allen trim servo's have a built in trim indicator potentiometer, this can be used for the analogue inputs on the D120/180.

You take from memory the 5v supplyand feed it to the potentiometer on the trim sensor (read the manuals or test it) and the other side to GND and the sweeper back to the GP input on say pin 22 or 23 for trim and flap on pin 4.

The flap indication is best measured with a liner pot from Ray Allen POS-12 which is P/No 11-01321 from Spruce.

You should be able to work it out from there!

Ours works well! ANd I have not flown it yet!

 

[dynonsupport]

You can use any potentiometer that varies in resistance as the position moves. The EMS calibrates the sensor, so it doesn't require a specific setup or sender. Lots of people just grab a potentiometer from Radio Shack and hook it up to the flaps with some bits.

The Ray Allen devices will work, but you cannot run the EMS and the Ray Allen display at the same time, since we are 5V and their display is 12V. If you want to use just the EMS, instructions on how to hook it up are in the EMS install manual.