Temperature Sensor DS18B20 Not Detected on Arduino Nano v3.0

I am having problems getting my temperature sensor to read on my Arduino Nano v3.0. I am hoping someone can take a look at my code/schematic and tell me where I'm going wrong. Temp returned is -127 (indicating no sensor found). I am using code from ds18b20 tutorial. I have attached the wiring diagram and have verified the temperature sensor works on a Raspberry Pi 2 B successfully using the 1-wire bus. Datasheet says the sensor takes between 2.7 and 5.5 volts and my voltmeter displays 4.69 vol

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