Example A: Using the Wildcard - Getting Single Sensor Information

This is a simple demonstration of the SDI-12 library for Arduino. It requests information about a single attached sensor, including its address and manufacturer info, and prints it to the serial port

PlatformIO Configuration

; PlatformIO Project Configuration File

[platformio]
description = SDI-12 Library Example A:  Getting information for a single attached sensor
src_dir = .piolibdeps/Arduino-SDI-12_ID1486/examples/a_wild_card

[env:mayfly]
monitor_speed = 115200
board = mayfly
platform = atmelavr
framework = arduino
lib_ldf_mode = deep+
lib_ignore = RTCZero
lib_deps =
    SDI-12

The Complete Example

/**
 * @example{lineno} a_wild_card.ino
 * @copyright Stroud Water Research Center
 * @license This example is published under the BSD-3 license.
 * @author Kevin M.Smith <SDI12@ethosengineering.org>
 * @date August 2013
 *
 * @brief Example A: Using the Wildcard - Getting Single Sensor Information
 *
 * This is a simple demonstration of the SDI-12 library for Arduino.
 *
 * It requests information about the attached sensor, including its address and
 * manufacturer info.
 */

#include <SDI12.h>

uint32_t serialBaud = 115200; /*!< The baud rate for the output serial port */
int8_t   dataPin    = 7;      /*!< The pin of the SDI-12 data bus */
int8_t   powerPin   = 22; /*!< The sensor power pin (or -1 if not switching power) */

/** Define the SDI-12 bus */
SDI12 mySDI12(dataPin);

/**
  '?' is a wildcard character which asks any and all sensors to respond
  'I' indicates that the command wants information about the sensor
  '!' finishes the command
*/
String myCommand = "?I!";

void setup() {
  Serial.begin(serialBaud);
  while (!Serial)
    ;

  Serial.println("Opening SDI-12 bus...");
  mySDI12.begin();
  delay(500);  // allow things to settle

  // Power the sensors;
  if (powerPin >= 0) {
    Serial.println("Powering up sensors...");
    pinMode(powerPin, OUTPUT);
    digitalWrite(powerPin, HIGH);
    delay(200);
  }
}

void loop() {
  mySDI12.sendCommand(myCommand);
  delay(300);                    // wait a while for a response
  while (mySDI12.available()) {  // write the response to the screen
    Serial.write(mySDI12.read());
  }
  delay(3000);  // print again in three seconds
}