Super Simple OSD Mods (4s + RSSI)

[HAWKS]

I try not to go below 3.2v per cell or 12.8v, but I have gone down to 12.0v a few times.

Cool! I hope to get out this afternoon and test....thanks

1/11/12 Tested on my Tri and all went O.K.

[turdsurfer]

I'm actually looking for a similar mod in order to use my SimpleOSD to measure the voltage of a 1S lipo (for my VTX+cam). The lowest voltage that it currently can measure is 4.09V. Can I simply replace the 1K resistor by a 2K resistor in order to measure the voltage of a 1S lipo as if it were a 2S lipo?

[Hmfpa]

Just to clarify, Simple OSD and Super Simple OSD are two different things.

Simple OSD: http://www.flytron.com/41-simpleosd-xl-edition.html
Super Simple OSD: http://www.hobbyking.com/hobbyking/s...dProduct=19369

I'm assuming that you're talking about Super Simple OSD (SSOSD)

SSOSD has 2 voltage inputs, BAT1, and BAT2.

The OSD gets its own power from BAT1. You need to supply 4-17v to BAT1. You cannot hook up a 1s to BAT1. Messing with the resistor values won't work here.

If you want to measure voltages lower than 4v, you first need to supply at least 4v to BAT1, and then connect the lower voltage to BAT2.

[turdsurfer]

Thanks! SSOSD was what I was talking about. I'll give that a try.

[elvenpure]

could anybody help me with the receiver end?
i dont quite get how this works.
where does the rssi come from?

[Hmfpa]

On the Corona 72mhz receivers, you can get RSSI from a solder point on the PCB, described here
http://www.team-blacksheep.com/article/page:20

[Danub]

Thanks for the tip Hmfpa. . . Just put one on my quad
4S works like a charm. . . gonna do the RSSI mod when I get a chance. . . I got a DL soo I am not too worried about that.
One question . . . . has anyone used a LC filter before the BATT1 to get a cleaner osd readout?
Does it cause issues??

[elvenpure]

what about 36mhz ones? they the same?
also what about the smaller ones like a six channel?

[Hmfpa]

Danub:

You could put an LC filter on the input, but it would have to be pretty big before it had an effect. I was experimenting putting a bigger capacitor on the regulator, but I accidentally fried it. It would be moderately complex to solder, and it would require you to buy parts online. Its easier just to live with it

Elven:
The 36mhz ones are the same. I don't know about the 6 channel ones, but you can probably find the solder points by googling it

[jendabek]

Hi,
I am not good at electronics - can someone explain me why we get only 2 steps resolution without the mod?
Thanks :-)