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[Paparazzi-devel] ADXRS300 Gyro basics

From: VCordes
Subject: [Paparazzi-devel] ADXRS300 Gyro basics
Date: Sun, 20 Jul 2008 12:36:22 +0200


I am about to use an AD XRS300 Gyro in my airframe.  Former IDG300 Gyro had a significant impact on GPS performance even after implementing a separate 3V3 power supply .

Is it advisable to supply it via tiny´s 5V rail ? which pins have to be connected apart from GND, 5V, Rateout ?

Can someone please comment calibration, means setting neutrals especially temperature and 2V5 reference?

Can someone also please comment the marked lines from the airframe file:

<section name="GYRO" prefix="GYRO_">
    <define name="ADC_ROLL_NEUTRAL" value="520"/>
    <define name="ADC_TEMP_NEUTRAL" value="476"/>  
->    <define name="ADC_TEMP_SLOPE" value="0"/> 
    <define name="DYNAMIC_RANGE" value="300" unit="deg/s"/>

->    <define name="ADXRS300_RESISTOR_BRIDGE" value="(3.3/(3.3+1.8))"/>
    <define name="ADXRS300_SENSITIVITY" value="5" unit="mV/(deg/s)"/>
->    <define name="ROLL_SCALE" value="3.3*1000./1024./(GYRO_ADXRS300_SENSITIVITY*GYRO_ADXRS300_RESISTOR_BRIDGE)" unit="deg/s/adc_unit"/>

    <define name="ROLL_DIRECTION" value="-1."/>

Anything else to setup and care for?

Thanks a lot


-------- Original-Nachricht --------
Datum: Sat, 19 Jul 2008 19:03:02 GMT
Von: "address@hidden" <address@hidden>
An: address@hidden
Betreff: Re: [Paparazzi-devel] recommendations and advices for my first paparaz zi-project


Avoid brushed motors - they are weak, produce significant electrical interference, and change performance with age, making altitude tuning difficult.

Also avoid nicad batteries for most of the same reasons.

Twinstar is a great airframe to start with but Minimag and Funjet are much more manageable alternatives (and cheaper to upgrade to Lipo/brushless)

Aerocomm modem will not really go 15km but it is of little consequence since the 200mW video is limited to a few km. You can connect the aerocomm directly to a FTDI cable and put it in any common electronics box (plastic or metal) for your ground modem.

-- Tim Hansen <address@hidden> wrote:

I want to build my first paparazzi aircraft. It would be nice if you
could look over the following list and tell me if you have any
suggestions or recommendations.
I took two frequencies for data and video (868 MHz and 2,4Ghz) to avoid

What I already have:
* R/C Controller with 8 Channels (40 MHz) and a 3 state switch
* 8 Cell Ni/Cd battery pack
* R/C receiver with 8 Channels (40 MHz) (I looked into it and found
the 4017 IC so I think it should be fine)
* Equipment for measuring, soldering and so on

Although I have the RC Controller I'm a total beginner.
What I'm planning to buy is:

Multiplex Twinstar II
including 4 servos and controller
for 157 Euro at

Tiny with LEA-5H GPS
including IR-Sensors
fully assembled
for ~240 Euro at

Gyros / IMU
-> Are they necessary for a good performance of the autopilot ?

Aerocom AC4868-250
250mW @ 868MHz
80$ = ~ 50 Euro @
-> I'm interested in the 15 km line of sight communication

Ground Based Modem
again the Aerocom AC4868-250 as above,
-> I haven't found any module with a metal case (stand alone module
for 868 MHz)
-> If you know where I can get the stand alone module please tell me

Video Transmitter and Receiver
200mW @ 2,4 Ghz
150$ = ~ 95 Euro @

12mm x 12mm x 12mm
Color, 370 Lines
80$ = ~ 50 Euro @

Alternatively I have another video solution but with a bigger camera:
470 Lines with night mode
32mm x 32mm
MTV-53X10HP-K @

FM2350TSIMP + external Control Chip
200mW @ 2,4 GHz
66 Euro @

Video Receiver
90 Euro @
50 Euro @

Do you have any experiences with the different systems and dealers?.
I'm open for ANY recommendations.

I live in Germany so I can't use the 900Mhz modems.

Thank you VERY much

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