EMS General Purpose Input for Contacts

mmarien

Murray M.
Joined
Dec 26, 2009
Messages
1,206
Location
Saskatoon SK CAN
Page 6-23 of the Skyview installation manual describes contacts which seems easy enough. The way I understand it is that you connect the pin to a switch and the other side of the switch to ground. As long as the switch is open (0-2 volts in the sensor settings) it is considered open. When the switch is closed and grounded (2-5 volts in the sensor settings) it will read closed.

To confuse things, the manual cautions that the voltage must not exceed 15 volts and in the standard sensor file they have PHEAT that I suspect is pitot heat. How do I connect the pitot heat to a general purpose pin to show that it is on or off and what would the sensor setting file look like? In my plane the pitot heat is 12V with a 15AMP breaker and 14GA wire.
 

dynonsupport

Dynon Technical Support
Staff member
Joined
Mar 23, 2005
Messages
13,226
For pitot heat, the assumption is that you are using our pitot probe. We have a specific wire output that tells you if we are heating (not just that we have power). This hooks to ground when heating, and to nothing when not.

Technically, in SkyView, contacts are no longer true digital inputs. It's still a 0-5V analog input, and you can choose to display all values below X in a certain color and all above X in a different color. You can actually do up to 5 ranges if you want.

We can't measure above 5V, but it won't hurt us to put in 12V. Put 12V in and you read 5. Put in 3V, and we read 3V.

So if you hook to the wire that goes to your pitot heater (or fuel pump, or baggage light) to the GP pin on the SkyView EMS module, just set the voltage for something like 4. When the switch is off, your voltage will be near 0. When the switch is on, it will be 12, which will read as 5. Set the threshold at 4 and it should work fine.
 

mmarien

Murray M.
Joined
Dec 26, 2009
Messages
1,206
Location
Saskatoon SK CAN
Ok - now it makes sense. The connection and the logic is opposite as to the sample settings file.

Also from the answer to my other question, on something like this I suspect I should protect the GP input wire with a 1A fuse.
 
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