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RPi Cases/DINpi

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This is a step by step manual on how to assemble an RPi A 2.0 with the DINpi housing.

You need a philips type screwdriver, a soldering iron and some solder to assemble the kit.

Abstract

The heart of the DINpi is a solder-in carrier board for the RPi 2.0 credit card sized computers.

DINpi carrier board with USB B socket

The DINpi carrier board is an electrically connecting adapter and it also supports the RPi mechanically.

DINpi carrier board with RPi A and USB B socket

It is realised as a prototyping board and allows for custom peripherals to be added directly adjacent to the RPi.

After mounting the RPi onto the carrier board this now unified hybrid board is then slid into the DIN rail mounting frame.

DINpi carrier board mounted onto DIN rail frame

There is also a modular shielding kit which can be used to effectively protect the RPi in harsh electromagnetic environments, as they often exist in industrial electrical installations.

DINpi assembled with the EMC shielding kit

The shielding kit follows the standard DIN rail module profile. The MCB on the right is provided as a reference to this form factor only and is not needed for the DINpi to work.

1. Mounting an RPi A into the DINpi carrier board with an USB B power socket

The USB B socket needs to be soldered into the board with a slight angle so the DIN rail mounting frame does not to obstruct the USB plug.

Angled USB B socket

1.1 Put the USB B socket with the pins upwards onto your workbench

USB B socket upside down on workbench

1.2 Plug the board into the socket (sounds wrong, I know)

USB B socket with DINpi board "plugged in"

Make sure the USB B socket remains flat on the desktop and the DINpi board rests on the far edge.

USB B socket with DINpi board - side view

This ensures the correct angle for the USB B socket.

1.3 Now, it's time to solder the socket pins into the board. Don't forget the housing latches as they carry the mechanical stress during plugging in and out.

1.4 Next step is to bridge the pi power filter circuit with a drop of solder. It is located between the USB B socket and the RPi. In case you got very harsh (or sensitive) EMC environment you can add a Pi filter circuit here.

Pi filter for Pi power shortcut with drop of solder

1.5 This step requires some experience and you may damage your RPi if you are not careful. If in doubt, carry on with the next step and return here after all the other solder points are sorted.

After inserting the RPi board into the DINpi carrier board you need to locate the bottom side of the RPi where the Micro USB power socket is mounted (on the top side) right next to the SD card socket. If you see LEDs you got the wrong corner, its the one opposite to the LEDs.

Unsoldered DINpi Power Pins and RPi Fuse and Diode

There you see a green fuse device and a black diode, and two tinned half-circles integrated into the DINpi board. These two are the two power supply "pins" of the DINpi board and you need to solder them now. Don't fuzz about with a lukewarm soldering iron now or you end up unsoldering the fuse or diode accidentally. I set my iron to full steam and start heating up the half-circles and after a few seconds I add solder until this drop of solder becomes bigger and bigger and reaches the part. One or two seconds later I get a smooth surface of the drop. This is the time to remove the iron without causing any mechanical movement to any of the boards until the solder has gone solid again (takes a few seconds, especially for the ground terminal). All this I do while I push the RPi and the DINpi boards together with the fingers of my other hand.

Soldered DINpi Power Pins and RPi Fuse and Diode

Ahh, well. Looks like I need to exercise a bit more myself! I'm sure you can do a better job than what you see in the photo.

1.6 I recommend at least two other solder points to improve the mechanical stability of the whole setup, again with respect to plugging in and out and the mechanical stresses involved during such events.

1.6.1 The sound socket central pin

Soldered sound port central pin

1.6.2 The network socket outer shielding pin

Soldered network port outer shielding pin

Et voila!

From here on its plug an play again: Insert an SD card, connect a serial adapter to the GPIO pins (if you want) and plug in USB power.

Soldered network port outer shielding pin

Any comments? Contact me at elinux at sign dinpi dot charlie oscar mike

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