The CP-IO22-A4-2 is an IO board accessory for the ComfilePi consisting of 22 digital IO (11 inputs, 11 outputs), 4 16-bit analog inputs, 2 12-bit analog outputs, screw terminals, and 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-A4-2 in C# 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

.NET 5 drivers can be found at the .NET IoT Libraries API Reference.

We also have an example using CODESYS demonstrating digital IO and analog inputs.

For analog outputs, please try the MCP4725 driver posted at the CODESYS Forge.

CP-IO22-A4-2 pins are connected to the ComfilePi's GPIO header as shown below.

• INPUT : GPIO 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16
• OUTPUT : GPIO 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27
• AD IN/OUT : I2C1 SDA, I2C1 SCL

• Input Voltage: 5VDC (powered by ComfilePi's 5V pin)
• Current Rating: 500mA or more
• Humidity: 35 ~ 85% RH
• Temperature: -30 ~ 60 ℃
• Size: 128mm X 78mm

• IC: ADS1115IDGST
• Interface : I2C
• Address: 0x48
• Input Voltage Range : -5Vdc ~ 0 ~ 5Vdc
• Resolution : 187.5uV / 1bit (-26,666 ~ 0 ~ 26,666)
• Sample Rate : 1.62mS

• IC: MCP4725A1T-E/CH
• Interface : I2C
• Address: Ch1-0x62, Ch2-0x63
• Output Voltage: 0 ~ 5Vdc
• Resolution : 1.22mV / 1bit (0 ~ 4094)
• Sample Rate : 12uS
• Maximum Output Current : 20mA

• 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.

Modify the ComfilePi's /boot/config.txt file with the following configuration to set the initial IO state. See GPIO control in config.txt for more information.

gpio=4-13=ip
gpio=16=ip
gpio=17-27=op,np,dl

To initialize the digital-to-analog outputs to 0 when powering on, run the following commands

pigs i2co 1 0x62 0
pigs i2cwi 0 0x60 0 0
pigs i2cc 0

pigs i2co 1 0x63 0
pigs i2cwi 0 0x60 0 0
pigs i2cc 0

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