Wooden it matter?

There is a bunch of peripherals popping out since the first release of Pi, cases are the most flourishing business at the moment. Despite of some doomsday designs here and there, some virtually free self-made cases really shows something.

While most people didn’t recognise the inability of heat radiation under plastic structures even the official one, thank god, you can still found some common sense active cooling design.

Some would argue the low-power consumption and hence low heat generation within the Pi, I always think of longevity and the headlessness of this little thing. Automation means you mind nothing while your creation works as a charm, and the Pi is hot like a pie after 30 mins of video processing from a USB webcam. (will add some benchmarks later)

With some daily tools like drills and cutters, one could only work on light materials that is good to pierce screws in, that is easy to cut, and at least provides a degree of heat penetration.

And this is the best choice I could have found without a laser cutter myself. (OK I admit this is personal, I love natural materials.)

(image links to product page)

This is not GPIO friendly and the size restricts it from plugging any development boards or expansion boards directly in, but I can easily mod it for sure. 😉

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RasPiComm v3

Nicely done, now take my money. 😛

Daniel Amesberger

I want to give you a short update about the RasPiComm progress. You’ll find the schematics of v3 below.

I reworked the whole board and rerouted it all. I tried to implement as much feature requests as I could while preserving the footprint.

I also decided to start working on a RasPiComm Plus board. It will be bigger and better! But it will not play in the same league pricewise.

But first things first, here are the changes I made:

  • Moved the backup battery out of the way. Now it does not collide with the DSI (S2) plug on the Raspberry Pi.
  • 5V tolerant inputs
  • pluggable terminals for power, RS232 and RS485
  • supressor diodes for the outputs. You can now directly connect relays to the outputs
  • output is now a pinheader. The RasPiComm focus is on serial communication. Sacrifice I had to made to get the pluggable terminal headers in.

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Good News! The all-in-one RasPiComm is getting closer

Daniel Amesberger

Thank you for all the views and responses on my original RasPiComm blogpost!

Here I want to explain the RasPiComm hardware. The software part will follow next week.
At the end of the post you will find the schematics of the RasPiComm version 1 and version 2.

If you are not interested in the RasPiComm hardware, take a look at the original RasPiComm blogpost!

Now, let’s start!

Version 1 vs. Version 2

As I mentioned in the first blogpost about the RasPiComm, I did two versions of the board. The first version had either one serial port OR an RS-232 port. I used the /dev/ttyAMA0 (TX on GPIO header pin 8 and RX on pin 10. You could either solder the MAX3232 for RS-232 or the MAX3483 for the RS-485 port. But there was another disadvantage: I used the GPIO1 (pin 12 on the GPIO header) for switching between…

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More peripherals

After the first week staying with the little raspi, I guess it is not designed to stay powered for more than 3 hours. Don’t have a termometer in hand, but with touching it suggest a 50-70 degree on both chips.

If I wanna carries it around working headless, there must be some kind of heat radiation. Let’s go for more hunting!

Image

  1. VGA ram heat sinks
  2. 20mm VGA fans x 2

Bluetooth be a boot up device?

After some Googling and studies, finally I can pair my ProMini with raspi. It seems the shift key is not working, don’t know what’s wrong. But while it works normally with my Mac and PC, I moved to the next step and stucked there — auto connection.

Seems the bluez library isn’t well documented in this, or it just leaving this for developers. If it is the case then I’ll have to write my own service for detecting the keyboard. (awe… headache)

Google suggest bluetooth over linux CLI is kinda poorly supported, developed and documented… well let’s keep studying.

Bluetooth being a boot up choice.

While aiming to make this little thing fully mobile, I kept searching for USB-compatible li-lon batteries and a palm-sized usb keyboard.

Tried setting up the bluetooth keyboard as a boot-up device, it seems I picked something not too suitable. Had difficulties setting up auto connection between the ProMini and Raspi… bluez library didn’t seem well documented, maybe it doesn’t even provide auto-pairing?

Don’t mind writing my own service for this, but first let’s make sure the bluez really meant to leave it to developers. 😐

Peripherals hunting

Bluetooth Keyboard, MAGIC-PRO ProMimi, soldering, solder

Sometimes it’s a headache when you walk into a electronics shop and have no idea on every single thing, especially when you got something lies between two categories. After a full day of shopping, asking and chit chats with those shop keepers, I decided to start with some basic equipments.

Here is what I got,

  1. MAGIC-PRO ProMini bluetooth keyboard (with trackball)
  2. 30W Soldering gun
  3. Solder

I guess I have to spend another whole day in the books…