The tricky part about the 1-Wire interface is that power, clocking and data all have to share the same wire. You can connect the devices to any digital Arduino pin, and use the OneWire library to access them. More information about the Arduino 1-Wire interface at: Some 1-Wire device are mounted inside rugged metal cases (similar to a button-style battery) where the outside is ground, and the button at one end is the data pin. That is 2^48 (281,474,976,710,656) devices that can be made with a unique address.ĭevices which use the 1-Wire interface include temperature sensors, and other devices which can store data (eg. It also includes the CRC of the address, so there are actually 6 bytes available per family of devices for unique codes. The 64-bit address includes a "family code" for example 0x28 for the temperature sensor. This means that even if multiple devices are connected to the same pair of wires they can be addressed individually. Each device is assigned a unique (world-wide) 64-bit code (conceptually similar to a MAC address on Ethernet cards). This is because the devices are "addressable". The 1-Wire interface is interesting because it lets you connect a number of devices using a single wire (plus a ground return).
A lot of the details however will be of more general interest.
This post describes how the 1-Wire interface works, with particular reference to the Arduino Uno which is based on the ATmega328P microprocessor chip.
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