The 1-Wire Network

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To send a signal on the 1-wire network, a device draws current from the data line, and the voltage drop across the pulldown resistor causes the data line's voltage to decrease. Zeros and ones are indicated with long and short low-voltage pulses, respectively. Generally, devices do not transmit unless instructed to do so by the master; the master creates a short "one" pulse, and the device extends the pulse if it is sending back a zero.