Expanded Scale Voltmeter

[Pic_User]

Hi Alain,

Looks like the temperature measurement while reading Voltage idea has already been put to use. By you!

I was not allowed to view the PDF you listed on the other forum.
After joining the forum was still unable to look at it.
I am interested in the pbp code and the PDF.

Are the batteries in those RC models high amps?

-Adam-

[Acetronics2]

Hi, Adam

The batteries in the models are supposed ( LOL !!! ) to be High Amp ... for the voltage not to "swing" too much when servos draw current.

That's why AA High cap. NiMh cells are NOT to use ( too high internal resistance )

You're right, we must register to download files at Mr CAM's ... some kind of courtesy !!!

For the files ... I think you got the scheme, I do not know why happend, but the Hex file is no more downloadable ( Forum doesnot bear .bas and .hex anymore !!! ) so, ... find the source here !!!

This program has been designed for low amp use ( Tx batt survey ), and the current is quite constant.

For Rx side ... things are much more complicated as current drawn can reach 2 or 3 amps for short periods, and the "quiescent" current is around 50 - 100 mA.

A not too false approach, is to move all plane control surfaces ON THE GROUND ... and see if buzzer ... buzzes ! ( current is then 1 - 1.5 Amp - so voltage has to be fixed for such current )
If it buzzes ... it means it's a good thing to charge batts ...


You'll find the Current / Voltage curves in the thread I gave you the address ... but those curves are for the Batts used in Txs ... ( 2000 - 2500 mAh LiPos )
You have to take YOUR BATT dedicated curve ...

Don't hesitate to Ask for any help ... the batt world is a Wild world !!!

Alain

[Pic_User]

Hi Alain,

I have been reading some of the stuff on the rc-cam.com forum. It is really interesting.
At first they wouldn’t allow the PDF down load, even though it congratulated me for joining. Then today, I tried and had no problem. Sooo, got the schematic and now got your code. Seems I can read PBP written in French, but the comments are a little fuzzy. Thanks for the files.

Reading the Voltage under high Amperage variations is a bit of a problem. My case let’s me stop the current and measure the Voltage. I will check the curves on the other forum and apply the principles to this project.

Probably good to check the batteries, on the GROUND, on a helicopter. We can imagine how well they fly without power!

The battery world IS a Wild world. The PIC world is a Fun world! I will be reading your information tonight. Thanks for the help.

-Adam-