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AW: AW: [Paparazzi-devel] Commercial boards

From: nisma
Subject: AW: AW: [Paparazzi-devel] Commercial boards
Date: Tue, 01 Aug 2006 05:00:31 +0200

-------- Original-Nachricht --------
Datum: Mon, 31 Jul 2006 23:57:40 +0200
Von: "Ethan Arnold" <address@hidden>
An: address@hidden
Betreff: AW: AW: [Paparazzi-devel] Commercial boards

> Is the board Paparazzi compatible?
some minor sw changes are needed, i have made it on a older paparazzi
branch times ago in two hours. Basically the servos, ppm in and
the modem rs232 is handled trought a single physical link with a coprocessor 
utilizing encapsulation and logical endpoints.
Further, no audio channel for the video link is implemented.
It´s possible to export the dac with a isolated amplifier to the
5V section, this will add 2-3 Euro. I use a rf-modem, so i don´t
have implemented it.
And there are 6 servo channels available. Servo extension boards
are always possible. 
The board have no sensor for the battery voltage, because i use a low
cost smb battery management chip (1.5 Euro) for battery balancing and
status control that provides all this information on the battery pack.
I have opted to totally isolate the battery (motor), servo and
electronic power sections in order that for some reason there is a short
on the motor power electronic or the servo, the costly sensors and cpu
remain intact. This means that i don´t have the same gnd level on the
different power sections and as such i can´t measure the battery
level with the 3V/5V cpu.

> How big is it (dimensions?)
With the analog sensors, 6x4x1 cm.
I have a version without the sensors and external gps module,
this is 2x4 cm.

> You mention a coprocessor, but what about a main processor?
lcp2148 arm, the same as your use actually on your arm paparazzi board.

> Is the IR board comparable to the Paparazzi design? I can hardly imagine
> how
> the board+sensors can be only 10 EUR, normally the sensors alone are at
> least 25-30$!

I source the sensor at 2 Euro in single quantity, 1.80 for quantity 10.
For the pcb, i have payed 30Euro for 40 ir-sensor pcb´s including shipping 

> Ethan
> -----Ursprüngliche Nachricht-----
> Von: address@hidden
> [mailto:address@hidden Im Auftrag
> von
> address@hidden
> Gesendet: Montag, 31. Juli 2006 23:50
> An: address@hidden
> Betreff: Re: AW: [Paparazzi-devel] Commercial boards
> 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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