Installation Guide (part 2): BeagleBone Black + Osso I/O cape board + Wiegand Reader

Describe the additional installation process required with such hardware. You should have first followed Installation Guide (part 1): Raspbian.

Installation guide

Additional Hardware

1. A BeagleBone Black
2. An Osso I/O cape board (see here)

Adding modules

We need a few modules to make thing works:

• Relays and digital inputs from Ossoe board can be accessed through the system GPIOs, we then need Leosac's SysFS GPIO module.

Configuring the SysFS GPIOS module

You can find the documentation of the module here. It focus on how to configure the module for any use case. We will instead explain why we need a given configuration.

We are using a Wiegand card reader. Therefore we need 2 INPUTs GPIO. We also have 1 OUTPUT gpio for the door.

BeagleBoard Black pinmap

We add this to our config file:

<module>
    <name>SYSFS-GPIO</name>
    <file>libsysfsgpio.so</file>
    <level>2</level>
    <module_config>
       <aliases>
            <default>gpio__NO__</default>
        </aliases>
        <export_path>/sys/class/gpio/export</export_path>
        <unexport_path>/sys/class/gpio/unexport</unexport_path>
        <edge_path>/sys/class/gpio/__PLACEHOLDER__/edge</edge_path>
        <value_path>/sys/class/gpio/__PLACEHOLDER__/value</value_path>
        <direction_path>/sys/class/gpio/__PLACEHOLDER__/direction</direction_path>                
        <gpios>
            <gpio>
                <name>wiegand_data_high</name>
                <no>47</no>
                <direction>in</direction>
                <interrupt_mode>falling</interrupt_mode>
            </gpio>
            <gpio>
                <name>wiegand_data_low</name>
                <no>45</no>
                <direction>in</direction>
                <interrupt_mode>falling</interrupt_mode>
            </gpio>
            <gpio>
                <name>my_door_gpio</name>
                <no>60</no>
                <direction>out</direction>
                <value>0</value>
            </gpio>
        </gpios>
    </module_config>
</module>

As you can see, we are defining GPIO using the gpio port <no> we wired our reader and door.

Note that we use <level>2</level> to make sure this module is one of the first to start. We are assigning meaningful name to our GPIO. Keep them in mind because we will reuse them later.

Wiring everything

This is the BBB with the Osso board plug onto it.

BeagleBoard and board

The expansion cape has to be powered by a 12VDC connector (9 to 24VDC supported), and it will power the Beagleboard from expansion pins ( no needs to give external power from usb or power connector on the beaglebone! )