by ProLine » Thu Mar 10, 2011 3:52 pm
Since you asked,
(Should I connect the Flytron board to AN2 then? I have only connected the + on the board to the live cable on the Lipo as they both share the same ground as the receiver.)
Long explanation but it should hit the facts.
From what I can find on the V1 RX it seems that both AN 1&2 ports can be used for analog voltage measurements. My V2 has AN1 tied to the RX power rail full time so it measures what ever the RX sees for power, BEC or battery. My Flytron Display shows the RX, AN1 voltage on top, the big numbers, and AN2 in the middle, and the RSSI (Receiver Signal Strength Indication(I think it's called that) at the bottom shown in %.
My V2 RX only allows me to send one extra voltage back on AN2 and I use that to read my main Lipo using a single red wire from the Lipo pack to the Flytron resistor pack into AN2. I read my BEC on the top larger display numbers, and the Lipo on the middle smaller display. The RSSI is at the bottom.
(You say that AN1 is for the receiver voltage. How is that achieved? What do I connect to AN1? When you say receiver voltage is that the voltage it gets from the BEC?)
As explained above for my V2 RX AN1 is tied into the RX voltage full time. In your case If I'm correct, you will use a Flytron resistor pack into AN1 and only the red wire from it tied into any unused RX servo channel + or with a Y cable if all the channels are in use. Others have done this I'm sure and hopefully will comment on this being the correct way to wire it, or suggest how to do it. I have no first hand knowledge as my order came with a newer V2 RX and I had no options there.
(What is the difference in the two voltage readings on the display? What does the big and the small reading tell me?)
Answered above I think but in my setup,
AN1 is the top larger display, (RX voltage) in your case you can make it anything.
AN2 is the middle smaller display (can be anything, I use it for onboard LIPO voltage.
Bottom RSSI in % is RX signal strength. I find this to rest at 57% while flying and goes lower at times. I get a warning beep when it hits 5% but never loose control and only a single beep. I've flown up and out to where the plane is a small dot and never have lost control, only an occasional beep. I hope more readers will comment on what, if anything, I should be concerned about? I'll never fly that far out in normal flying.
I strongly suggest that if the voltage alarms are important to you, then you should make or buy a variable power supply 3-12 volts let's say. It's a great tool for checking the auto Lipo cut off on the BEC's(Some cut off much lower than you think!) as well as setting the threshold alarms in your Frsky TX module. There are some simple DIY circuits on the internet. Also a Digital Volt Meter that you can trust the reading is the best tool for all electrical circuits.
Maybe Bruce or others will elaborate more on these "tools". If I have time in the future I may give it a try. Bruce's DIY on Utube is the best for this sort of thing.
OK then,
Get all this going and do some flying and let me/us know how it all works for you. It's a flying hobby first, right? Feel free to ask more questions.
ProLine
I may not always be correct, but it's never stopped me from giving free advice. Remember what you paid for it!