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Old Dec 28, 2015, 07:01 PM
VF-Alpha is offline
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Quote:
Originally Posted by changosurf View Post
I see. I'd probably be able to help with some of it, but unfortunately, I don't own an i2c airspeed sensor, so I wouldn't really be able to test or do much without one. I'd be flying blind

Your best bet might be to find some example code for your sensor and try loading it up on an arduino.

Also, be aware that, if you're trying to set this up on something like a minimOSD, you'll have to solder directly to the MCU pins in order to access the i2c port on the ATMega.
No I bought a board from someone ( designed by dennis) I had designed my own but that one will be done later with imu and bmp soldered directly

I do have an airspeed sensor I could mail to you.( one used on a DOSD) I was thinking of using an eagle tree airspeed sensor since they already give sample code. which i could buy one of those and mail to you. Which would probably be easier to implement.
pseudo code airspeed address is 0xEAA
----------------------------------------------------


byte data[2];
signed short reading = 0xFFFF;
i2c_start();
// select sensor in write mode
if (!(i2c_write(SENSOR_ADDRESS | I2C_WRITE_BIT)))
{
// send "read data" command to sensor
if (!i2c_write(0x07)) {
i2c_restart(); // perform I2C restart
// select sensor in read mode
if (!i2c_write(| SENSOR_ADDRESS | I2C_READ_BIT)
) {
// read two bytes of sensor data
data[0] = i2c_read(1);
data[1] = i2c_read(0);
reading = *((signed short *)(&data[0]));
}
}
}
i2c_stop();
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Old Apr 05, 2016, 10:36 PM
RBeaubien is offline
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DronePlastics.com
United States, AZ, Glendale
Joined Mar 2007
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Question, is the MinimOSD schematic open source? I see all kinds of places that make them. Wondering because I want to create some custom parts with the OSD built in.
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Old Apr 05, 2016, 11:20 PM
irun4fundotca is online now
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its widely available, I think it is
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Old Apr 06, 2016, 12:24 AM
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yes the minim osd is open source, even the hardware, but keep in mind the maxim chip is end of life, and will be harder to get genuine chips. i think my supplier has a mere 17 chips left. non genuine chips require some code tinkering.
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Old Apr 06, 2016, 12:49 AM
RBeaubien is offline
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Ok, but where do I find the schematic from? To be clear, I'm looking to design something that would be compatible with MWOSD and/or KVOSD.

Edit: And you can buy the MAX7456s by the 1000s off of Alibaba.
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Last edited by RBeaubien; Apr 06, 2016 at 12:59 AM.
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Old Apr 06, 2016, 01:05 AM
irun4fundotca is online now
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those are clones for sure

its easy to find
https://www.google.ca/search?q=minim...w=1360&bih=651

heres a minimosd v3 that has naza inputs too
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Old Apr 06, 2016, 02:52 AM
VF-Alpha is offline
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Quote:
Originally Posted by RBeaubien View Post
Ok, but where do I find the schematic from? To be clear, I'm looking to design something that would be compatible with MWOSD and/or KVOSD.

Edit: And you can buy the MAX7456s by the 1000s off of Alibaba.
This is why I said Genuine chips. Clones are easy to find, but require some mods to the code to work sometimes, it really depends on the clone.
this is the schematic for the minim osd. it's easy to modify for more breakouts.
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Old Apr 06, 2016, 03:25 AM
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That is exactly what I was looking for, but I don't see where you found it in that google search. I have been searching (google, bing, etc) high and low for this. Thanx.
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Old Apr 06, 2016, 03:30 AM
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Quote:
Originally Posted by VF-Alpha View Post
This is why I said Genuine chips. Clones are easy to find, but require some mods to the code to work sometimes, it really depends on the clone.
this is the schematic for the minim osd. it's easy to modify for more breakouts.
Sorry, missed that. Half the world is producing these things so whatever modifications that are needed can't be too difficult. My board supplier has their own version and I'm sure they will look my design over and make recommendations like they usually do so I'm not too worried. Thanks for the help guys.
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