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

A quick tutorial to using MiniPiio AIN4 4-ch Analog Board

March 28th, 2014 No comments

The latest version of raspi-config allows you to enable the SPI drivers without having to edit raspi-blacklist.conf file yourself.

In LXTerminal start raspi-config by type:

raspi-config

Select the advance menu option and chose enable SPI devices. Exit the menu and reboot your Pi.

We’ll program our example in Python, so we’ll start by downloading the SPIdev driver library.

We can use Python Installer to get install it:

sudo pip install spidev

A quick python example is shown below:

[code language=”python”]
#!/usr/bin/python

import spidev
import time

# ADC Channel
ADCCHAN = 1

# Open SPI, use Chip Select 0
spi = spidev.SpiDev()
spi.open(0,0)

while True:

adc = spi.xfer2([1,(8+ADCCHAN)<<4,0]) data = ((adc[1]&3) << 8) + adc[2] print ('ADC CH1 =', data) [/code] The MiniPIIO Uses a Microchip MCP3004 (or MCP3204) which are from the same ADC familily as the MCP3008 You can find the MiniPIIO AIN4 at our Tindie store:

MiniPiio_Expander2_DIO16_AIN4_small

 

New board – MiniPIIO Breakout!

March 21st, 2014 No comments

MiniPIIO Breakout! is our newest add-on board for the Raspberry Pi.

It breaks out (hence its name) all the Pi’s expansion I/O into four neat little groups.

UART is broken out into a 6-Way and 4-way pin header. The 6-Way is FTDI USB Cable compatable.

SPI is broken out into two 6-way headers, each with it’s own SPI chip select.

I2C is borken out into two 4-way headers.

GPIO is broken out into two 10-way headers. GPIO4/17/18/22/23/24/25/27 and 3.3V and 0V.

RPi-_MiniPiio_Breakout!_top_small

You can buy it at our Tindie store here

RPi-X SensoRPi – more photos & update

March 9th, 2014 No comments

We’ve got a couple of more photos to show you. This time the RPi-X SesnoRPi is mounted into a case.

RPi-X_SensoRPi+PiBow2 RPi-X_SensoRPi+PiBow1

Mounted into a case the SensoRpi is extremely ridged.

We’ve continued testing and the electronics are all confirmed working. So far we’ve tested it using Python and RPi.GPIO, next we’ll be testing it using Scratch with the GPIO extensions from Simon at Cymplecy.

Once we completed our Scratch software testing will be looking to extend our testing to Gordon’s wiringPi and RPIO

RPi-X ELab101 – mini electronics lab

March 7th, 2014 No comments

RPi-X ELab101 is the second of our RPi-eXperimeter boards.

RPi-X_Elab101_small
RPi-X ELab101 is a mini electronics lab for the Pi.

It is dominated by a 170-pin bread boarding area for prototyping and construction your circuits on. Next to this, there are 3x tactile switches, 3x LED’s, 2x potentiometers and a buzzer circuit which make up the input and output devices. These are connected to female headers allowing them to be quickly interfaced with the Pi’s GPIO’s using simple male-male jumper wires.

For analogue measurements, a 4-channel 0V to 10V, 10-bit ADC is included and it’s inputs are also available via a female header connector.

Finally, all the signals from the Pi’s expansion header are brought out to female headers, giving access to all the Pi’s expansion signals, including the GPIO’s, SPI, I2C, UART and PWM.

RPi_and_RPi-X_Elab101_small
More to come….

RPi-X SensoRPi – first photos

March 3rd, 2014 No comments

Here’s some photos of the first partially built boards:

 

RPi_X-SensoRPi_small

MiniPiio RS232 set-up

November 26th, 2013 No comments

By default the Raspbian uses the serial UART to access the shell console. To change this we need to make a few small changes to the cmdline.txt and inittab files

Make a backup of the two files we’ll be changing.

sudo cp /boot/cmdline.txt /boot/cmdline.bak
sudo cp /etc/inittab /etc/inittab.bak

In the LXterminal shell type the command:

sudo leafpad /boot/cmdline.txt

Find and remove “console=ttyAMA0,115200” and “kgdboc=ttyAMA0,115200” parameters.

The cmdline.txt will probably contain the default configuration line:

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200
console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

Find and remove “console=ttyAMA0,115200” and “kgdboc=ttyAMA0,115200” configuration parameters so it looks something like this:

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

Make sure to save the file and quit the editor.

Finally edit the “/etc/inittab” file to disable the use of the “ttyAMA0” serial port. In LXterminal type this command:

sudo leafpad /etc/inittab

Near the bottom of the file, look for a configuration line that includes the “ttyAMA0” port address.

Type a hash (or pound) sign (“#”) in front of the line “ttyAMA0”.

Save the file and exit the editor. Once done to reboot your Pi.

Once the Pi is rebooted, you can use “ttyAMA0” to access the serial port.

Piio’s and MiniPiio’s boards are now for sale on Tindie

November 9th, 2013 No comments

Pii and MiniPiio Boards are now for sale on Tindie

Details are here:

https://www.tindie.com/stores/DTronixs/

Categories: MiniPiio, PCB, Raspberry Pi Tags: