In my previous post https://olimex.wordpress.com/2012/11/21/raspberry-pi-gpio-to-breadboard-and-uext-adapter/ I wrote about the Raspberry pi adapter we designed which allow Raspberry Pi to have access to the modules we have like Relay modules, Thermocouple sensor modules, 3-axis magnetometer and accelerometers, Zigbee, WiFi, GSM, GPS etc.
The RPI-UEXT adapter is already in stock and you can wire it to your Raspberry Pi with any 26-pin ribbon cable, we do offer 15 cm cable also which you can use with RPI-UEXT
On this video you can see how Raspberry PI is controlling MOD-IO 4 relays with the help of the RPI-UEXT adapter: http://www.youtube.com/watch?v=vuHU2SmLYBI
to make MOD-IO control as on above video with your RPi you should do as follows:
step 1:
sudo vi /etc/modprobe.d/raspi-blacklist.conf
The file should look like:
# blacklist spi and i2c by default (many users don’t need them)
blacklist spi-bcm2708
#blacklist i2c-bcm2708
step 2:
sudo vi /etc/modules
# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with “#” are ignored.
# Parameters can be specified after the module name.
i2c-dev
snd-bcm2835
step 3:
sudo apt-get install python-smbus
step 4:
sudo vi modio.py
import smbus
import time
bus = smbus.SMBus(0)
address = 0x58
while 1:
bus.write_byte_data(address, 0x10, 0x0F)
time.sleep(1)
bus.write_byte_data(address, 0x10, 0x00)
time.sleep(1)
step 5:
sudo python modio.py
and you will see how the relays go ON and OFF 🙂
have fun!
olimex 
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