Archive

Archive for April, 2014

Two new Raspberry Pi add-on boards

April 29th, 2014 No comments

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.

RPi_MiniPiio_Thermocouple2_RFM12B_small

 

 

New Board – MiniPiio SimpleIO

April 14th, 2014 No comments

MiniPiio SimpleIO is just that, an 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.

RPi_MiniPiio_SimpleIO_top_small

You can find them at our store on Tindie.

Note: LED and Switches sharing the same GPIO so are not designed to used simultaneously.

Raspberry Pi RS485 Module

April 8th, 2014 No comments

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.


MiniPiio Thermocouple

April 6th, 2014 No comments

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

RPi_MiniPiio_Thermocouple_small

RPi_and_MiniPiio_Thermocouple_small