Simple arduino sketch to test DS18B20 waterproof sensor

I purchased 5 DS18b20 waterproof sensors on Amazon.  The first one I hooked up I couldn’t get a reading from.  I spent hours trying different libraries, sample sketches, etc.

Finally I decided to try a different sensor and it worked the first try.  Turns out four of the five sensors I bought were bad.

So, if you need to diagnose a bad sensor, here’s the simplest sketch you can use.  I found it here.

#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into pin 2 on the Arduino
#define ONE_WIRE_BUS 7

// Setup a oneWire instance to communicate with any OneWire devices
// (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

void setup(void)
// start serial port
Serial.println("Dallas Temperature IC Control Library Demo");

// Start up the library

void loop(void)
// call sensors.requestTemperatures() to issue a global temperature
// request to all devices on the bus
Serial.print(" Requesting temperatures...");
sensors.requestTemperatures(); // Send the command to get temperatures

Serial.print("Temperature for Device 1 is: ");
Serial.print(sensors.getTempCByIndex(0)); // Why "byIndex"?
// You can have more than one IC on the same bus.
// 0 refers to the first IC on the wire



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