Re: AW: [Paparazzi-devel] Commercial boards

[nisma]

-------- Original-Nachricht --------
Datum: Mon, 31 Jul 2006 23:19:28 +0000
Von: "Yves Touchette" <address@hidden>
An: address@hidden
Betreff: Re: AW: [Paparazzi-devel] Commercial boards

> 
> We would have to write servo code for the PIC, something that isn't 
> currently in Paparazzi.
The pic will come preprogrammed and i can make the source code open source.
The reason for the pic was a pure economical in order to get a 0.5 uS 
resolution.
Utilizing the avr MCU (mega48), the price was triple compared to the 
pic because of the needed external osc and increased pcb space.

> 
> Which GPS are you using?
Personally, i use a fastrack oem module (kalman filtering,
3d mode with only 3 satellites in view using external altitude information, 2 
for 2d mode, update frequency up to 50 HZ without
kalman filtering), however it´s no problem to use a Ublox or it´s cheaper
second source (only 1Hz update rate, but better power saving mode).
> Are the sensor all on the same board?
With the exception of the gps , yes.
In the case of utilizing the Ubox gps, this will be added to the board
incresing the size for 2cm.
> 
> Do you have any pictures? Can you provide an approximate cost of a board 
> with the components?
Sure, i can export the BOM and write it down the actual cost.

> 
> If you can get you boards manifactured for these price, couldn't you get
> the 
> paparazzi board manifactured for similar prices?
It´s possible to review the paparazzi board and make a new layout.
As example, jtag bondary scan must be added in addition to some test 
points. A new test fixture must be made for testing this board.
Even with layout changes, it´s possible to reuse the same test fixture
as i have used. The library must be exchanged and i must use the one
from the assembler for the correct solder paste and adding some pcb
marks for the placement machine. Test SW must be adapted.
The fixture have a cost of 20-30 Euro, so it´s not that cost.

As you can see, there is necessare some work and i don´t want to have
2-3 different layouts. Maybe i want have a layout with optional components,
that are populated as needed.


> 
> thanks for the precisons!
> 
> -yvest
> 
> >I have a own design, with rtos, usb bootloader, usb hd.
> >I can sell the board, but the layout and schematic can not be
> >released under any gpl licence.
> >A short description below.
> >
> >15W 8-14V to 5V isolated step-down converter (oem)          optional
> >1W 5V to 3.3V isolated step-down converter   (oem)          optional
> >5V ldo psu 1/3A                                             optional
> >voltage doubler + 5V ldo for 5V yaw gyro + 5V to 12Volt flash vpp
> generator
> >(maxim/LT) for analog sensors (pressure, pyro) supply.      optional
> >lpc2148 cpu
> >serial spi flash (8Mbit)
> >vcc monitoring with i2c memory (cat)
> >8x 24bit adc for magnetometer, pressure sensor             optional
> >8x 24bit adc for 3x gyro + rel pressure sensor + 3d accell sensor.  
> >optional
> >isolated rs232 tranceiver, 1Mbit max
> >optional 2x isolated rs232 available on request
> >pic coprocessor (5V) for servo output and ppm input (0.5 uS resolution)
> >and servo mixing.
> >3.3V gps
> >
> >Excepts the component costs, the pcb and assembling costs 15$ / board,
> >special configuration requires a minimum order of 12 boards (1 panel).
> >
> >The IR board is sold separatly and costs ~10Euro including
> >4x IR sensors, (optional coating and housing available on request).
> >
> >For a new design modification, the pcb overhead is 5$ (film costs).
> >Because the automatic smd placing is extracted from the eagle files,
> >there is no extra setup costs.
> >
> >Regards
> >Chris
> >
> >--
> >
> >
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> 
> 
> 
> 
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