April 29, 2014
A new batch of PCB’s arrived today.
There were two new Raspberry Pi add-on boards in the box.
The first board is a 2-channel Type-K Thermocouple converter based on the MAX31855 chip.
The second board is RF Transceiver based of HopeRF popular RFM12B module.
I’ll plan to build them up in the next few days and if all goes well I’ll list them in our Tindie store.
April 28, 2014
This years Maker Faire UK 2014 is over, phewww.
Just had two great days at Maker Faire helping to man our Makerspace stand. We had lots of great stuff on show again this year. Jay was there with his ginormous 3D printer. Chris had his hypnotic LED cubes. Jon’s flying duck looked on on us. Dan had parked his quad copter. Ed had his reflex game. Myself I had brought out R-Kade (my Raspberry Pi powered Arcade cab) for its yearly outing.
As always, Maker Faires are a great way to bump into old maker friends and these year I met up with Aaron Nielsen (Oomlout), Mike Cook (aka Grumpy Mike) and Mitch Altman of Noisebridge fame.
April 14, 2014
MiniPiio SimpleIO is just that, a add-on board with simple inputs and outputs. It features 8x LED’s and 8x tactile switches. The Pi’s GPIO4/17/18/22/23/24/25/27 are each connected to an LED and switch.
You have 8x signals you can mix and match with whatever combination of LED’s or switches your design needs. So if you need more indicators you could have say 6x LED’s and 2x switch inputs and like wise, if you need more inputs than outputs you could have 5x switch inputs and 3x LED outputs.
You can find them at our store on Tindie.
Note: LED and Switches sharing the same GPIO so are not designed to used simultaneously.
April 14, 2014
Eh? Why another prototyping board? Isn’t the CM I/O a prototyping board already?
Yes, it is. And the CMIO ProtoBoard is a prototyping board for you to build circuits directly on with can be used with the CM I/O board and Compute Module.
Same as blinking an LED is the first code you write for a new embedded system, designing a prototyping board is often the first thing I do with every new system I work with.
Why, I hear you ask?
- I want some thing I can quickly build permanent circuits with, so the days of loose wires spoiling my days are far behind.
- I want some thing that is cheap and cost effective. I want to experiment with different circuit designs, without worrying if I’ve wasting money every time I start a something new.
- I want some thing that when its built looks decent and not a heap of wire
Some of the dimensions and connector positions I’ve had to guess at but here’s a quick layout of what I’ve done so far:
April 8, 2014
The MiniPiio RS485 is a RS485 to TTL 3.3V converter board specifically designed to work with the Raspberry Pi.
It uses 3.3V components and is completely voltage compatible with the Raspberry Pi.
The board connects directly to the Raspberry Pi’s UART Rx and Tx to provide RS485 half-duplex communications.
The board uses the industry standard MAX3485* for signal conversion.
An industry standard 9-Way D Connector (Male) and a 3-W screw provides provides the serial connection to the outside world.
Pin-out (9W D):
Pin-5 = 0V Pin-8 = B (Data +) Pin-9 = A (Data -)
In addition, the GPIO signals can be used to control the MAX3485* DE and !RE as needed.
PIIO and MiniPIIO are modular electronic building block for the Raspberry Pi and may be used with our RPi Expander2.
*or Equivalent IC
You can find them on our Tindie store.
April 6, 2014
MiniPiio Thermocouple is a single channel temperature measurement add-on board using Type-K thermocouples.
The MAX31855 is a sophisticated thermocouple-to-digital converter. It features a built-in 14-bit analog-to-digital converter (ADC) for thermocouple measurement. In addition it also contains a cold-junction sensor for compensation temperature sensing and correction.
The MAX31855 resolves temperatures to 0.25°C. It allows readings as high as +1800°C and as low as -270°C and exhibits thermocouple accuracy of ±2°C for temperatures ranging from -200°C to +700°C for K-type thermocouples.
– Works with any K type thermocouple
– Temperature range = -200°C to +1350°C output
– Resolution 0.25 degree
– Accuracy is ±2°C
– Internal cold junction temperature reading
– SPI bus interface
– Two SPi Chips Selects (!CE0 and !CE1)
You can find it at our Tindie store