Check telemetry values on battery connection only (eg old pack plugged in)

[xoexoe]

Inspired by this post ( https://www.helifreak.com/showthread...=3#post8143467), I wanted to create a logical switch that checked for flight pack battery voltage automatically when plugging in the battery. This would get triggered only when plugging in the battery and only if the battery voltage is below some threshold value. It should not get triggered during flight.

Think of it as making sure you didn’t just plug in an old pack. Maybe this was obvious to everyone, but I had to think a bit in how to do it, so I thought it’d be useful to post how I did it here. I did it in 2 logical switches, not 1 unfortunately. But here it is..

First create a regular “less than” logical switch using your flight pack telemetry voltage and whatever critical value you want. This is L08 in the image below from my Horus. It will be used in a different LS, not directly.




Next, create an Edge logical switch [L09 above] that is (1) triggered by your voltage telemetry, which will act as a True Boolean in this context if there is data being received; (2) only true momentarily after 1.0 second of telemetry reception**; (3) is only triggered if the original voltage comparison [L08] is also true.

** I chose 1.0 sec instead of 0.0 sec because the system I tested this on (uSpirit v3.1.0, YGE LVT, Horus X10S, OpenTX 2.3.9) momentarily sent a 0.0 volt value upon telemetry acquisition. The 1.0 sec is to filter out that noise. Adjust to your liking.

If you’re unfamiliar with Edge, they are fantastic. The “1.0” means only ever consider the LS if the triggering switch is true for at least 1.0 sec, and the “<<“ means immediately after 1.0 sec without delay.

Finally, create a Special Function to alert you. I did something basic below:

[Rabid121]

cool solution you found... great to see how good some systems are working with telemetry nowadays.

Ciao
Michael

nb: ... and as a pos. side effect this will put some pressure on the 'later starters' in the Tx business

[Ivan]

To expand a bit on this, the same set of logical switches can be set for 75%, 50%, etc based on lipo voltage curves so they only trigger once at each point.

However, no specific way to play a number is available, so I set a GV as the appropriate number for each one and use "play value" of that GV then "percent" when the logical switch triggers.

This works well if you don't have current sensing, or in constant load configs where the voltage may be critical due to draw as opposed to total consumption (EDFs).