Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» 4-20 mA 02: Current Loop Connection State

This sketch shows how to use the most important features of the 4-20mA current loop board in Waspmote. This standard is used to transmit information of sensor over long distances. Waspmote uses analog inputs for reading the sensor values.

Required Materials

1 x Waspmote
1 x Battery
1 x 4-20mA Board

Notes

- Don't use the 12V output to supply industrial devices, only for 4-20mA sensors.
- Be sure that your sensor is compatible with the 4-20mA board specifications.
- This example can be executed in Waspmote v12 and Waspmote v15

Code

/*
 *  ------ [4-20mA_02] Current Loop Connection State --------
 *
 *  Explanation: This sketch shows how to use the most important
 *  features of the 4-20mA current loop board in Waspmote. This
 *  standard is used to transmit information of sensor over long
 *  distances. Waspmote uses analog inputs for reading the sensor
 *  values.
 *
 *  Copyright (C) 2019 Libelium Comunicaciones Distribuidas S.L.
 *  http://www.libelium.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 *  Version:          3.1
 *  Design:           David Gascon
 *  Implementation:   Ahmad Saad
 */

// Include this library for using current loop functions
#include <currentLoop.h>

void setup()
{
  // Sets the 5V switch ON
  currentLoopBoard.ON(SUPPLY5V);
  delay(100);

  // Sets the 12V switch ON
  currentLoopBoard.ON(SUPPLY12V);
  delay(100);
}

void loop()
{
  if (currentLoopBoard.isConnected(CHANNEL1))
  {
    // Get the sensor value in int format (0-1023)
    int value = 0;
    // Voltage and current conversion variables
    float voltage = 0;
    float current = 0;

    // Read from the ADC
    value = currentLoopBoard.readChannel(CHANNEL1);

    USB.print("Int value read from channel 1: ");
    USB.println(value);

    // Get the sensor value as a voltage in Volts
    voltage = currentLoopBoard.readVoltage(CHANNEL1);


    USB.print("Voltage value read from channel 1: ");
    USB.print(voltage);
    USB.println(" V");

    // Get the sensor value as a curren in mA
    current = currentLoopBoard.readCurrent(CHANNEL1);
    USB.print("Current value read from channel 1: ");
    USB.print(current);
    USB.println(" mA");


    USB.println("***************************************");
    USB.print("\n");

  }
  else {

    USB.println("The sensor is not connected...");

  }

  // Delay after reading
  delay(1000);

}

Output

H#

Int value read from channel 1: 131
Voltage value rad from channel 1: 1.3612903356V
Current value read from channel 1: 7.4291305541mA
***************************************

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