Cheapo OSD + FPV 200mW Transmitter V2

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adrianatkins
Posts: 11
Joined: Wed May 01, 2013 8:39 pm
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Cheapo OSD + FPV 200mW Transmitter V2

Post by adrianatkins » Mon May 20, 2013 7:24 pm

Hi again.

Here's Version 2.
It now has an I2C interface for an optional GY-65 Barometer module.
If present, the OSD will show Altitude, with Rising/Sinking indicators as well as accurate Temperature.

I tried the Buck/Boost ideas to eliminate the FPV battery, but a small 500mAh 1S FPV battery works out simpler and cheaper to do.
By reducing the voltage to the 3v3 regulator, nothing gets Hot.

OSD shows :-
1. Rising/Sinking
2. Altitude (m)
3. Temperature DegC
4. Flight battery voltage
5. FPV battery voltage
6. Elapsed Time

(Rise/Sink & Altitude only available with a GY-65 module attached)

The Battery voltages start flashing at 3.3v per cell. Time flashes after 15mins. Temperature flashes at -1 degree C.

My GY-26 compass simply did not work, and the sheer weight of the maths involved in deciphering the GY-65 meant that i ran out of variable space and program memory (16 bytes left !) on the PIC, so i stopped trying to add a compass.

The Fuses required to flash the pic are :-
INTOSC, pins as I/O
Watchdog on
PWRT off
MCLR as digital input
BOR off
CLKOUT disabled
LVP off
4x PLL enabled
version2.png
Cheapo OSD + FPV Transmitter V2
Attachments
FPV OSD + BATT.HEX
firmware
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adrianatkins
Posts: 11
Joined: Wed May 01, 2013 8:39 pm
Country: -

Re: Cheapo OSD + FPV 200mW Transmitter V2

Post by adrianatkins » Tue May 21, 2013 3:38 pm

2013-05-21_05-31-23-PM.jpg
screenshot

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