The CP-IO22 is an IO board accessory for the ComfilePi consisting of 22 IO (11 inputs, 11 outputs) screw terminals, and corresponding indicator LEDs. It can be mounted to the rear panel of the ComfilePi.

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The following is an example project illustrating how to program the CP-IO22 in C# or VB.Net using the Mono Framework.

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This example PInvoke's the pigpio library. For more information see the PInvoke documentation and the pigpiod C interface documentation

The CP-IO22 pins are connected to the ComfilePi's GPIO header as shown below.

Inputs: GPIO 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16
Outputs: GPIO 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27

• Input Voltage: 5VDC (powered by ComfilePi's 5V pin)
• Current Rating: 400mA or more
• Humidity: 35 ~ 85% RH
• Temperature: -30 ~ 60 ℃
• Size: 128mm X 78mm

• Voltage Range: 12 ~ 24V
• Absolute Min/Max Voltage Range: 3.3 ~ 28V
• Response Time: 5ms
• Input OFF Level: <1.8VDC
• Input ON Level: >2.5VDC
• Indicator LED OFF Level: <4.5V
• Indicator LED ON Level: >5.0V

• DC Output Sink (NPN) x 11
• Maximum Output Voltage: 30VDC
• Response Time: 10ms
• Current: 150mA

It may be necessary to modify the ComfilePi's initial GPIO output state to prevent the ComfilePi from turning the outputs ON when the ComfilePi boots.

1. Backup the existing /boot/dt-blog.bin file.

   cp /boot/dt-blob.bin dt-blob-backup.bin

2. Run the following command to decompile the /boot/dt-blog.bin file.

   sudo dtc -I dtb -O dts -o dt-blob.dts /boot/dt-blob.bin

3. Open the resulting dt-blob.dts file in a text editor and navigate to the pins_cm3 { pin_config { … node.
4. Add the following to the pins_cm3 { pin_config { … node:

   pin@p17 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO17
   pin@p18 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO18
   pin@p19 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO19
   pin@p20 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO20
   pin@p21 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO21
   pin@p22 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO22
   pin@p23 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO23
   pin@p24 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO24
   pin@p25 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO25
   pin@p26 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO26
   pin@p27 { function = "output"; termination = "no_pulling"; polarity = "active_low"; startup_state = "active"; }; // GPIO27

5. Recompile the dt-blob.dts file replacing the existing /boot/dt-blob.bin file.

   sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob.dts

6. Reboot and the outputs should all be OFF when the ComfilePi is booted.