How to control GPIO for raspberry?

[jeffwoo]

May i know how to control GPIO for raspberry? I have a small project, need to use raspberry as a human machine interface communicate with arduino thru modbus serial. arduino will capture the realworld signal and processing. And raspberry will use to key in parameter and display the result. This project will have data logger to store the data to USB storage on raspberry and export to excel file. Is that possible to be done in Rapid Scada? Please advice how to do it ? Thank you very much.

[Mikhail]

Yes, your task can be solved by Rapid SCADA.
Are you going to use GPIO of Arduino and use Raspberry as a server only?
Or Raspberry also should work with its own GPIO?

[jeffwoo]

Thank you very much for fast reply. Currently plan to use GPIO of arduino and Raspberry as server only. but is it possible to control raspberry GPIO as well?

[jeffwoo]

May i know how to do it?

[Mikhail]

You should develop a driver for SCADA-Communicator as describerd here.
To access Raspberry GPIO look for a wrapper such as this one.

[Mikhail]

I recommend to implement Modbus prorocol on your Arduino. In this case you can easily connect it to Rapid SCADA.

[sarinda]

Hi,
Can you please tell me a Modbus library for Arduino which is compatible with RapidScada. I am having troubles with communicating with an arduino.

I tried following code. It works with QMB (for modbus checking) but no data is received by rapidScada.

#include <modbus.h>
#include <modbusDevice.h>
#include <modbusRegBank.h>
#include <modbusSlave.h>

/* PINS
Add more registers if needed
Digital input pins 2,3,4,5,6,7
Digital output pins 8,9,12,13
Analog output pins 10,11 (PWM)
Analog input pins 0,1,2,3,4,5
*/

modbusDevice regBank;
modbusSlave slave;

int AI0,AI1,AI2,AI3,AI4,AI5;

void setup()
{   
  regBank.setId(1); ///Set Slave ID

//Add Digital Input registers
  regBank.add(10002);
  regBank.add(10003);
  regBank.add(10004);
  regBank.add(10005);
  regBank.add(10006);
  regBank.add(10007);
// Add Digital Output registers
  regBank.add(8);
  regBank.add(9);
  regBank.add(12);
  regBank.add(13);
//Analog input registers
  regBank.add(30001);
  regBank.add(30002);
  regBank.add(30003);
  regBank.add(30004);
  regBank.add(30005);
  regBank.add(30006);
//Analog Output registers
  regBank.add(40010);  
  regBank.add(40011);  

  slave._device = &regBank;  
  slave.setBaud(9600);   
  
  pinMode(2,INPUT);
  pinMode(3,INPUT);
  pinMode(4,INPUT);
  pinMode(5,INPUT);
  pinMode(6,INPUT);
  pinMode(7,INPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  pinMode(12,OUTPUT);
  pinMode(13,OUTPUT);
   
}
void loop(){

  while(1){   
  //Digital Input
    byte DI2 = digitalRead(2);
    if (DI2 >= 1)regBank.set(10002,1);
    if (DI2 <= 0)regBank.set(10002,0);
    byte DI3 = digitalRead(3);
    if (DI3 >= 1)regBank.set(10003,1);
    if (DI3 <= 0)regBank.set(10003,0);
    byte DI4 = digitalRead(4);
    if (DI4 >= 1)regBank.set(10004,1);
    if (DI4 <= 0)regBank.set(10004,0);
    byte DI5 = digitalRead(5);
    if (DI5 >= 1)regBank.set(10005,1);
    if (DI5 <= 0)regBank.set(10005,0);
    byte DI6 = digitalRead(6);
    if (DI6 >= 1)regBank.set(10006,1);
    if (DI6 <= 0)regBank.set(10006,0);
    byte DI7 = digitalRead(7);
    if (DI7 >= 1)regBank.set(10007,1);
    if (DI7 <= 0)regBank.set(10007,0);
                                
  //Digital output
    int DO8 = regBank.get(8);
      if (DO8 <= 0 && digitalRead(8) == HIGH)digitalWrite(8,LOW);
      if (DO8 >= 1 && digitalRead(8) == LOW)digitalWrite(8,HIGH);
    int DO9 = regBank.get(9);
      if (DO9 <= 0 && digitalRead(9) == HIGH)digitalWrite(9,LOW);
      if (DO9 >= 1 && digitalRead(9) == LOW)digitalWrite(9,HIGH);
    int DO12 = regBank.get(12);
      if (DO12 <= 0 && digitalRead(12) == HIGH)digitalWrite(12,LOW);
      if (DO12 >= 1 && digitalRead(12) == LOW)digitalWrite(12,HIGH);
    int DO13 = regBank.get(13);
      if (DO13 <= 0 && digitalRead(13) == HIGH)digitalWrite(13,LOW);
      if (DO13 >= 1 && digitalRead(13) == LOW)digitalWrite(13,HIGH);
            
  //Analog input  ***READ Twice deliberately
    AI0 = analogRead(0);
    delay(10);
    AI0 = analogRead(0);
    regBank.set(30001, (word) AI0);
    delay(10);
    
    AI1 = analogRead(1);
    delay(10);
    AI1 = analogRead(1);
    regBank.set(30002, (word) AI1);
    delay(10);
    
    AI2 = analogRead(2);
    delay(10);
    AI2 = analogRead(2);
    regBank.set(30003, (word) AI2);
    delay(10);
    
    AI3 = analogRead(3);
    delay(10);
    AI3 = analogRead(3);
    regBank.set(30004, (word) AI3);
    delay(10);
    
    AI4 = analogRead(4);
    delay(10);
    AI4 = analogRead(4);
    regBank.set(30005, (word) AI4);
    delay(10);
    
    AI5 = analogRead(5);
    delay(10);
    AI5 = analogRead(5);
    regBank.set(30006, (word) AI5);
    delay(10);
        
  //Analog output 
    word AO10 = regBank.get(40010);
    analogWrite(10,AO10);
    delay(10);
    word AO11 = regBank.get(40011);
    analogWrite(11,AO11);
    delay(10);
        
  slave.run();  
  }
}

[Mikhail]

Hi,

This topic has another subject. Please create a new one. I can’t recommend you a library but I’ll try to help you to establish connection if you post communication line log.

[manjey73]

https://github.com/Manjey73/OpnenKPs/tree/master/KpRpi3 (readme – online translate)
https://github.com/Manjey73/OpnenKPs/releases/tag/KpRpi3 (use gpio 5-27, in archive use all gpio)

[Mikhail]

Thanks a lot!
A also recommend to post the above links with a description of a work to RPi forum, like this.

[Author]

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