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

The pigpio library also has a Python interface.

The following is an example illustrating digital inputs and outputs:

import pigpio
 
pi = pigpio.pi()
 
pi.set_mode(4, pigpio.INPUT)
pi.set_mode(17, pigpio.OUTPUT)
 
while True:
    if pi.read(4):
        pi.write(17, 1)
    else:
        pi.write(17, 0)
 
pi.stop()

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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