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Faisal Shah
  • Male
  • Houston, TX
  • United States
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Faisal Shah's Discussions

Ardupilot Shield V2 schematics?

Is there any specific reason? The eagle files for the Ardupilot are posted, for which this is a shield board. Anywhoo, thanks for replying - I've been lazy, I'll just take out the half hour and make…

Replied Nov 15

Ardupilot Shield V2 schematics?

Can I get the eagle files for this. I've asked a few times in a couple of different places ... Is there any issue in posting the eagle schematic and layout? How about the footprint for the pressure s…

Replied Nov 15

SCXL004DN Differential pressure sensor (0 to 4in H20)
2 Replies

This is super expensive on DigiKey ($85), but it is being sold on electronic goldmine for cheap! $8.95!!) http://www.goldmine-elec-products.com/pro was thinking of using this for speed measurement in…

Started this discussion. Last reply by Doug Weibel Nov 21.

Eagle files for ArduPilot Shield

Are the eagle schematic and layout files available for the shield board? I wanted to get the footprint for the MPXV5004DP differential pressure sensor, amongst other things I would like to take a loo…

Started Nov 11

 

Faisal Shah's Page

Latest Activity

Faisal Shah commented on Chris Anderson's blog post 'Booz: New Paparazzi project for quadcopters'
Hey Jordi, short of using the adxl gyros - which of the cheaper ones are least effected by vibration? ST Micro, Invensense?
on Monday
Mueller replied to Faisal Shah's discussion 'Gyro Vibration Immunity: Differential gyro's'
Hello, the problems with the ST-MEMS gyros is the low resonator frequency oft 4 kHz. Iit is just the frequency of the vibration generated by the propellers. So ST sensors have problems with vibrations. The ADXRS work over 20kHz and do not have this…
on Monday
Faisal Shah commented on Curt Olson's blog post 'MicroGear hardware in the loop demonstration with FlightGear'
Curt: No problem. I noticed there wasn't any code posted, so I referenced my post in which there is some bare-bones .C code which someone could use to go down this path :) . I must say, the tree structure thru which various simulation parameters are…
December 3
Faisal Shah commented on Curt Olson's blog post 'MicroGear hardware in the loop demonstration with FlightGear'
Thanks Curt for this wonderful tool. For those of you who are curious on how to get data in and out of flightgear, I wrote a blog post which details it here: http://www.diydrones.com/profiles/blogs/closed-loop-autopilot-1 . Included is also a C prog…
December 2
jstoezel replied to Faisal Shah's discussion 'Interfacing 5V sensor with 3.3V uC'
Well there's your approach, and the approach that thousands of other people take. To start with 5V MUCs are not a viable solution. 5V MCUs also do consume more power at the same frequency than 3.3V MCUs. And this should be considered when developin…
November 25
Faisal Shah commented on Lorentz's blog post 'New ST evaluation board'
dang, that's almost *exactly* what i was making (with the exception of adding a differential pressure sensor, remote mounting the magnetic sensor, including a failsafe, and more pwm in/outputs). Parts alone (excluding PCB) are over 100 bucks.
November 23
Doug Weibel replied to Faisal Shah's discussion 'SCXL004DN Differential pressure sensor (0 to 4in H20)'
@Ken, thanks for the heads up. I'd have probably tried it otherwise.
November 20
Faisal Shah commented on automatik's photo 'Razor 6DOF - gyros - 1x and 4x HawkSky - motor bench test-annotated'
How is the Razor board mounted? Have you taken any measures to dampen the vibration? Can you post a picture of your setup please. Are the low and high pass filters installed on each of the gyro outputs?
November 15
Vincent replied to Faisal Shah's discussion 'How many switches/pushbuttons/LEDs to use, and for what'
I've seen some really nice surface mount LEDs that have three colors on the one LED.
November 15
Faisal Shah replied to Rik Vlaming's discussion 'Ardupilot Shield V2 schematics?'
Is there any specific reason? The eagle files for the Ardupilot are posted, for which this is a shield board. Anywhoo, thanks for replying - I've been lazy, I'll just take out the half hour and make the library parts I need :)
November 14
Faisal Shah replied to Rik Vlaming's discussion 'Ardupilot Shield V2 schematics?'
Can I get the eagle files for this. I've asked a few times in a couple of different places ... Is there any issue in posting the eagle schematic and layout? How about the footprint for the pressure sensor?
November 14
Ken replied to Faisal Shah's discussion 'SCXL004DN Differential pressure sensor (0 to 4in H20)'
Thanks for the lead on the low cost purchase. However I wonder if these are really suitable. About 15 years ago, when I worked for the avionics industry, a SenSym rep paid me a visit and gave me a couple of their pressure sensor devices to sample, i…
November 13
Faisal Shah added a discussion
SCXL004DN Differential pressure sensor (0 to 4in H20)
This is super expensive on DigiKey ($85), but it is being sold on electronic goldmine for cheap! $8.95!!) http://www.goldmine-elec-products.com/prodinfo.asp?number=G17180 I was thinking of using this for speed measurement instead of the MPXV5004DP,…
November 13
Faisal Shah commented on Jose Julio's video 'Vibrations/aliasing problems with arduIMU code'
Please post your gyro and accelerometer part numbers.
November 13
Caleb Chamberlain commented on Faisal Shah's blog post 'CHR-6d Inertial Measurement Unit (6DOF) - with'
Robin - You are right, the group delay for the FIR filter is fairly long, especially considering that the internal sample rate of the IMU is only 350 Hz, and considering that the filters are linear-phase. I set it up so that you can change the numbe…
November 12
Andrus Kangro replied to Faisal Shah's discussion 'Interfacing 5V sensor with 3.3V uC'
you are correct, Krzyztof, mpxv5004dp offset is 1v. I did mean by saying that its close to zero that its, well, closer to zero than to vcc:-)
November 11

Faisal Shah's Blog

Faisal Shah

CHR-6d Inertial Measurement Unit (6DOF) - with




http://www.chrobotics.com/CHR6d.php

FEATURES

* IMU weighs less than 1.5 grams
* .8" x .7" footprint
* Customizable FIR digital filter
* TTL UART communication interface
* 16-bit ADC resolution
* +/- 400 deg/s gyro dynamic range
* +/- 3 g accelerometer… Continue

Posted on October 28, 2009 at 11:02am — 4 Comments

Faisal Shah

Closed loop autopilot simulation with FlightGear - Part 2

Figured out how to close the loop!

Programs can interface with FlightGear through FlightGear's property tree. Very powerful.
http://wiki.flightgear.org/index.php/Property_Tree

If you run FlightGear with the --httpd= option, it will run a webserver on http://localhost: where you can browse the property tree and refresh the current values. Alternatively, in FlightGear you can type "/", and the property tree viewer will pop up and y… Continue

Posted on October 25, 2009 at 11:02pm — 2 Comments

Faisal Shah

Closed loop autopilot simulation with FlightGear - Part 1

I don't have the cash right now to buy a plane, ArduIMU, an auto pilot, and associated hardware. So, while I'm saving for the hardware, I want to play with the various algorithms out there in a simulation environment - to gain a deeper understanding and feel for it. I want to be able to code in C, so I can use the code directly in the hardware autopilot when I reach that point.

I want to use a flight dynamics model to generate sensor inputs to the autopilot (3 axis gyro, 3 axis accelerometer, G… Continue

Posted on October 19, 2009 at 10:30pm — 2 Comments

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