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Project #009 - DakarOSD/Lynx RC Plane OSD - Page 2 - DakarOSD Pcb

DakarOSD PCB

This first pic is actually Ver 1.0 and has since been revised to Ver 1.1. Also, please note that I haven't actually built a Ver 1.1 board yet, but the changes were really only around the voltage Regulator and adding a bit of filtering on the RSSI amp.

You can download the Eagle Pcb layout, parts list, component layout & schematic diagram here.

Note:- I suggest you do NOT get the silkscreen layer printed as I never really optimized it on the layout.

Here's the final PCB (Ver 1.1) as per Eagle PCB. Double sided Through Hole Plated (THP).
The graphic below is not to scale, the actual size of the pcb = 2.6" x 1.5"

This is the pinout of the board, and as you can see utilizes the same 3-way headers making wiring easy because for the most part uses standard RC servo extension lead type wiring. Please take care when hooking up your other hardware to these headers. It is always worth double checking voltages/polarity etc before you plug in.

DakarOSD - The GPS module I use is the LS20033. My DakarOSD pcb is set up mailny to suit this GPS module only, whilst the firmware (V2.7b) is actually capable of interface to a few different types of modules. See Cristóbal's Spanish pages for more info.

 



GPS Module
The DakarOSD board can interface to two or three different types of GPS module, however, I favour the LS20033 module. Note: Below is the LS20033 cable I have been using as purchased from these guys here.
Please note that it's not quite pin compatible with the 4-way header on the DakarOSD V1.1 pcb (sorry, my fault!).
I have marked on the colours on the pin-out of the DakarOSD pin-out above. You will need to re-wire the 4-way on the cable below (or cut & link some of the tracks on the back of the pcb).

 

The PDF datasheet for the LS20033 GPS can be found here.

Here is the assignment of the colours on the cable.

Black = 0vdc
Red/Purple = +3.8vdc
White = Tx sig out of GPS
Green = Rx sig into GPS

 



Current Sensor
Allegro Hall Effect Current Sensor (P/N ACS756SCA-050B). This sensor is capable of measuring up to 50amps of in-line current and with an in-line resistance is only 130uOhms.

There are a few additional components on the output side that are necessary and which I have incorporated onto the DakarOSD, thus making hook-up dead easy.

The 3 interface pins of the sensor are wired up directly to the 3-pin header on the DakarOSD pcb.

The PDF data sheet for the sensor is available here.