MinimOSD in DIYDrones Store!
Hello guys!
I'm very happy to tell you that the MinimOSD is now in stock in the DIY Drones store!
And more: It goes with a nice customized CharSet and an open source OSD firmware already flashed! ;)
The firmware is Arduino compatible and it uses the original APM MAVLink messages to bring out with some nice features.
Here you can see the Artificial Horizon being tested on HIL side by side with the XPlane AH gauge.
Let me talk a bit more about the firmware that goes flashed on the board:
The current open sourced OSD implementation is part of the ArduCAM OSD project which has support from all the DIYD Dev Team.
The requested APM MAVLink messages are grabbed, translated and it's displayed pretty fast.
But... why it supposed to be fast?
Firstly, the OSD class descends from BetterStream from Mike Smith, which turns it able to format and print better than the Arduino's avr-libc variant does.
Second, the CharSet was rearranged to match the ASCII table. It eliminates the need for a "translation" layer.
There is also a smart way to write individual panels with less SPI transactions (that is conventionally used only to write the full screen at once).
The MAVLink parsing uses a reduced number of buffers, which fits better m328p's resources.
Those things above improves considerably the OSD job.
Our friend Jani already wrote the EEPROM routines to make it configurable. So, it has the base for an external configuration tool.
There is much more work to be done for adding functions and improve it.
We're pretty sure that it will be improved a lot in the hands of the awesome DIYD comunity.
Well, let's talk about features:
MinimOSD is able to work attached to the ArduPilot telemetry port in two modes:
1 - as master i.e. requesting rates of all required messages from APM (both TX and RX from OSD board are connected);
2 - as "sniffer" i.e. just listening to all the messages requested from the GCS (only TX from OSD board is connected).
The firmware auto-detects PAL or NTSC and adjusts the panels.
Until now it has this panels:
- MAVBeats pulse
- Altitude
- Speed
- Battery voltage
- Battery Remaining
- Throttle
- Number of Visible Satellites
- GPS Fix data
- Latitude
- Longitude
- Artificial Horizon
- Heading (0-360)
- Compass (N,E,S,W)
- Pitch
- Roll
- Distance to home*
- Direction to home*
*Based on spherical coords with geographic distortion corrected;
The hard work continues... but, the fun is already granted, of course!
Grab yours right now and happy flights! ;)
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Developer Comment by Sandro Benigno on March 1, 2012 at 5:45am -
@Chris Kreuzer: To read RSSI on APM2 you'll need a receiver that exposes the RSSI as an analog output signal from 0 up to +5V. Spektrum telemetry has no RSSI exposed.
You will find analog RSSI output signal on virtually all Long Range System as an important resource for safe FPV flights.
Here goes a picture of my ChainLink receiver with RSSI output:
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Comment by Chris Kreuzer on March 1, 2012 at 5:53am -
I just recived my minimOSD... I connect it to a 4wired FTDI cable.
I open OSD Config and...... FAILED TO TALK TO BOOTLOADER aahhhhhh why?!?
The Red LED on the minimOSD is on. Teh yellow one flashs a little bit.
COM Port 16 ist correctly installed.
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Comment by Andke on March 1, 2012 at 6:08am -
Chris Kreuzer - because you use 4 wire cable, as good as three.. no reset signal
- just apply power to minimOSD in the moment you try to communicate.
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Developer Comment by Sandro Benigno on March 1, 2012 at 6:08am -
@Chris Kreuzer: What do you mean with 4wired? Is it the brand? Sorry if I'm misunderstanding it, but you need a all the six pins attached there. I t was tested using DIYDrone's FTDI Cable 3.3V and also FTDI basic adapter from SparkFun.
Are you using the latest ArduCam OSD Config?
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Comment by Andke on March 1, 2012 at 6:11am
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I do not know what he means with 4 - but it's only RX,TX and GND that are useful of those - and will work if he does like my previous post says.
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Comment by Chris Kreuzer on March 1, 2012 at 6:12am
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OK... i have the wrong cable :-(
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Comment by Chris Kreuzer on March 1, 2012 at 6:14am
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how i apply power? @Andke
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Developer Comment by Sandro Benigno on March 1, 2012 at 6:24am -
@Chris Kreuzer: Now that I understood. Yes... isn't the best cable. But, probably all you need to do is press the reset on the board every time you click on a button that needs to communicate with bootloader.
E.g.: If you click on "Save to EEPROM" so you quickly follow pressing the reset switch on the board. It should work.
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Comment by Chris Kreuzer on March 1, 2012 at 6:32am
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Thanks Sandro... pressing the RESET helps... But i orderd the other cable too.
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Comment by Chris Kreuzer on March 1, 2012 at 7:09am
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Can i display the speed in km/h instead of m/s?
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