Building the AirPi Circuit Board

RaspberryPaul_0117 - CopyI received my AirPi a few months ago but it took me a few weeks to build up the courage to build it.  I wouldn't say it was a complicated build but did take me about 3 hours.

One thing that confused me with the build was that the UV sensor had been replaced with a microphone.  Also worth noting that the kit doesn't come with a GPS module - this was known when ordering.

Tools used

Header

RaspberryPaul-seubdzsThe first step is to solder on the 26 pin header that attaches the airpi to the Raspberry Pi.  I found the best way ro solder it on is to solder one pin first, then the pin in the opposite corner, and to make sure the header is flat against the circuit board.

There's nothing worse than soldering all pins and find the header isn't straight.

You do not need to trim the header pins.

Resisters and humidity Sensors

RaspberryPaul-ki40mshRaspberryPaul-bisysfzNext step is to solder in the DHT22 humidity sensor and also the resistors.  Be carefull to check the resister values.  The documentation isn't that clear so I used a multimeter to test each resister.  The resisters can be put on the circuit board any way round.

I find it best to pull the resisters through the holes and bend them slightly so they don't fall out again.  Only cut the wires when there solder in and you are happy they're in the right place.

Capacitors

RaspberryPaul-iqfsnfeThere are 2 capacitors that need to be solder on.  The red one can be solder either way around.  The large black one has to be inserted the correct way round.  On one side there's minus signs and this should be aligned with the same markings on the circuit board.

LED's (Light Emitting Diodes)

RaspberryPaul-pl3wifbNext up are the 2 LED's.  The green one signifies a successful upload, red an unsuccessful.

The LED's have to be solder the correct way round.  The shorter leg on the LED is the negative leg.  The longer leg should be placed in the hole marked with a positive sign.  Again only cut the wires when you're happy.

BMP085 Pressure Sensor

RaspberryPaul-pl3wifbThe pressure sensor is the separate circuit board.  You may or may not have to solder the small legs on to the pressure circuit board.  Then solder the complete assembly on to the main board.  I used a bit of bluetack to keep the boards attached when I turned them over to solder them.

 Microphone, Light Dependant Resistor (LDR) , Mics 7210 and Mics 5525

RaspberryPaul-qkerqz4The LDR can be solder either way around.

The microphone should be placed so that it matches the outline on the circuit board.

With the Mics 7210 and Mics 5525 alight the tab with the markings on the circuit board.  Each should only fit in one place.

8 Pin Header and IC Sockets

The 8 pin header is next (it's green).  The shorter pins should be soldered to the board.

The IC sockets are next.  They should be soldered the correct way round to match the white outline on the circuit board.  It doesn't really mater which way they are around - but it does mater which way the chips go in.

Then insert the IC's in to the sockets.

The finished board

RaspberryPaul-0fimcdvRaspberryPaul-fdaen2vThe finished AirPi.  Total time for building it was about 3 hours.  Nothing really difficult apart from the header that attaches the AirPi to the Raspberry Pi.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>