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21 Δεκ 2023 · In this section, I show you how to connect the speed signal (tachometer signal) of a 3 or 4-wire fan to an Arduino to measure the fan speed. You cannot just connect the yellow wire of a 3 or 4-wire fan to a digital input of an Arduino to read the fan speed.
To implement a speed control for a common DC brushless fan, the following items are required: • A 4-wire fan with both a tachometer output and speed control input • A frequency counter peripheral to measure the tachometer output (fan speed) • Either an analog drive (0-12V) or a digital PWM (0-12V)
A 4-wire fan has power, ground, a tach output, and a PWM-drive input. PWM, in brief, uses the relative width of pulses in a train of on-off pulses to adjust the level of power applied to the motor. A 2-wire fan is controlled by adjusting either the dc voltage or pulse width in low-frequency PWM.
26 Ιουν 2002 · Learn how a linear circuit measures temperature and controls the speed of a cooling fan by generating a variable supply voltage for the fan.
28 Σεπ 2000 · A fan speed regulator actually measures and regulates the speed of the fan using its tachometer. When the MAX6650 is used as a fan speed controller, a microcontroller reads the temperature from the MAX6625 and the fan speed from the MAX6650 via the SMBus-compatible interface.
27 Ιουν 2012 · I would like to build an anemometer, and my idea is to start using the hall-effect sensor of the unexpensive pc fans (we all have an old pc fan at home). I can correctly measure pc rotation speed according to this Arduino Playground - ReadingRPM but this is not exactly what I need.
From fan pulse signal (tachometer) convert to speed by measuring the frequency of the tachometer which 1 full rotation of fan represent 2 pulse signal. Thus, for a minute times with 60 seconds. Fan speed in RPM:
