COMFILE Technology's Documentation Library

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====== CP-IO22-A4-2 Digital and Analog I/O Board for the ComfilePi 40 pin header ======

The CP-IO22-A4-2 is an IO board accessory for the [[comfilepi:index|ComfilePi ]] consisting of 22 digital IO (11 bipolar 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 CPi-A/B/S series panel PCs.

This product cannot be mounted on CPi-C070WR4C.

If you need PNP outputs, please use the [[:cpio:cp-io22pnp:index|CP-IO22 PNP]].


{{ :cpio:cp-io22-a4-2:cpio22a4front.jpg?nolink |}}

[[http://comfiletech.com/new-products/cp-io22-a4-2-io-board-accessory-for-the-comfilepi/|Buy]]

{{ :cpio:cp-io22-a4-2:cpio22a.png?nolink |}}

===== C# Control Example =====

The following is an example project illustrating how to program the CP-IO22-A4-2 in C# using the [[:comfilepi:index#net_c_vbnet|Mono Framework]].

{{ :cpio:cp-io22-a4-2:cp-io22-a4-2.mp4?700x400 |}}

[[https://github.com/COMFILE-Technology/ComfileTech.ComfilePi.CP_IO22_A4_2.Demo|Source Code]]

This example application uses the following .NET libraries to control the digital inputs, outputs, and I2C devices.
  * [[https://www.nuget.org/packages/System.Device.Gpio/|System.Device.Gpio]]
  * [[https://www.nuget.org/packages/Iot.Device.Bindings/|Iot.Device.Bindings]]


===== Python Example =====

The pigpio library also has a [[https://abyz.me.uk/rpi/pigpio/python.html|Python interface]].

The following is an example illustrating digital inputs and outputs:

<code Python>
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()
</code>

===== CODESYS Example =====

We also have [[comfilepi:codesys:index|an example using CODESYS]] demonstrating digital IO and analog inputs.

For analog outputs, please [[https://forge.codesys.com/forge/talk/Runtime/thread/8981ce928a/?limit=25#7b36|try the MCP4725 driver posted at the CODESYS Forge]].

===== Pin Map =====
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

{{ :cp-io22-a4-2:cpio22a42back.png |}}

===== Specifications and IO Circuitry =====
  *  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
{{ :cpio:cp-io22-a4-2:cpio22a42schematic.png |}}

====  Analog Inputs ====
  * IC: [[http://www.ti.com/lit/ds/symlink/ads1113.pdf|ADS1115]]
  * Interface : I2C
  * Address: 0x48
  * Input Voltage Range : 0 ~ 5Vdc
  * Resolution : 187.5uV / 1bit (-26,666 ~ 0 ~ 26,666)
  * Sample Rate : 1.62mS

====  Analog Outputs ====
  * IC: [[http://ww1.microchip.com/downloads/en/DeviceDoc/22039d.pdf|MCP4725]]
  * Interface : I2C
  * Address: Ch1-0x62, Ch2-0x63
  * Output Voltage: 0 ~ 5Vdc
  * Resolution : 1.22mV / 1bit (0 ~ 4094)
  * Sample Rate : 12uS
  * Maximum Output Current : 20mA
====  Digital Inputs ==== 
  * Bipolar relative to COM x 11
  * 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
====   Digital Outputs ====
  * DC Output Sink (NPN) x 11
  * Maximum Output Voltage: 30VDC
  * Response Time: 10ms
  * Current: 150mA

===== Setting the Initial IO State =====

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 [[https://www.raspberrypi.com/documentation/computers/config_txt.html#gpio-control|GPIO control in config.txt]] for more information.

<code>
gpio=4-13=ip
gpio=16=ip
gpio=17-27=op,np,dl
</code>

To initialize the digital-to-analog outputs to 0 when powering on, run the following commands in a terminal.
<code>
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
</code>

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