Example Code for Arduino-Voltage Analog Output

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• Multi USB/RS232/RS485/TTL Converter V2.0 x 1
• Water-proof Ultrasonic Sensor (ULA) x 1
• Connectors

Software Preparation

• Arduino IDE

Wiring Diagram

The internal probe surface is regarded as the detecting starting point by default. If you take the plane of the bell-mouth as starting point, then the distance will be the detected distance minus 40mm.

Sample Code

* **************************************************** 
* @brief Water-proof Ultrasonic Sensor (ULS)

 * @copyright	[DFRobot](https://www.dfrobot.com), 2016
 * @copyright	GNU Lesser General Public License

* @author [Xiaoyu]([email protected])
* @version  V1.0
* @date  2019-03-11
  
* GNU Lesser General Public License.
* All above must be included in any redistribution
* ****************************************************/
#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX
int analogPin = 0;//Define analog pin 0
int val = 0;
void setup() {
        Serial.begin(57600);     // Enable serial port  and set band rate to 57600 bps
        mySerial.begin(9600);
        pinMode(LED_BUILTIN, OUTPUT);
        digitalWrite(LED_BUILTIN, HIGH);
}

void loop() {      
        val = analogRead(analogPin);// Read analog port value
        float voltage= val* (3.3/1023);//Convert data
        Serial.print("Vout:");
        Serial.print(voltage);
        Serial.println("m");
        delay(200);  
        }  

Result