The DS18B20 differs from analog temperature sensors like the LM35 in one key way: its output is fully digital, eliminating the need for analog-to-digital conversion and reducing the noise issues that come with analog signals.
Components needed
An Arduino board, a DS18B20 sensor module, a 4.7k-ohm pull-up resistor, and connecting wires.
Wiring it up
The sensor relies on the 1-Wire protocol, allowing bidirectional communication over a single data line (DQ), plus power (VDD) and ground (GND) pins — just three pins compared to the complexity of multi-wire sensors. The data line requires a 4.7k-ohm pull-up resistor connected between the signal line and the supply voltage to keep data transmission stable.
How it works
The sensor measures temperature across a wide -55°C to +125°C range with ±0.5°C accuracy, and configurable resolution from 9 to 12 bits (the 12-bit default gives 0.0625°C resolution). It operates on 3 to 5.5V with low current draw of up to 1mA during conversion. Several DS18B20 sensors can be wired to the same data line at once, since each sensor carries a unique factory-programmed address that lets the code tell them apart.
You can find the DS18B20 sensor at Juthour Tech.
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