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2. Computer fan control - Wikipedia

   en.wikipedia.org/wiki/Computer_fan_control

   A PWM-capable fan is usually connected to a 4-pin connector (pinout: Ground, +12 V, sense, control). The sense pin is used to relay the rotation speed of the fan and the control pin is an open-drain or open-collector output, which requires a pull-up to 5 V or 3.3 V in the fan.

3. Computer fan - Wikipedia

   en.wikipedia.org/wiki/Computer_fan

   Connectors usually used for computer fans are the following: Three-pin Molex connector KK family This Molex connector is used when connecting a fan to the motherboard or other circuit board. It is a small, thick, rectangular in-line female connector with two polarizing tabs on the outer-most edge of one long side.

4. File:MiniDIN-4 Connector Pinout.svg - Wikipedia

   en.wikipedia.org/wiki/File:MiniDIN-4_Connector...

   The Pinout of a 4 pin mini-DIN connector (as viewed from the socket) Date: 18 June 2006 (original upload date) Source: No machine-readable source provided. Own work assumed (based on copyright claims). Author: No machine-readable author provided. Mobius assumed (based on copyright claims). SVG development

5. Molex connector - Wikipedia

   en.wikipedia.org/wiki/Molex_connector

   AMP Mate-n-Lok and Molex 8981 0.093-inch pin and socket power connectors Molex standard 0.093-inch pin and socket connectors Molex disk drive power connection system tool and connectors Molex Mini-Fit Jr. connector as used for ATX power supply. A Molex connector is a

6. Pmod Interface - Wikipedia

   en.wikipedia.org/wiki/Pmod_Interface

   Pmods come with a standard 6-pin interface of 4 signals, one ground and one power pin. Double and quad Pmods also exist. These duplicate the standard interface to allow more signals to pass through to the module. Pmods can use either SPI, I 2 C or UART protocol. With I 2 C it is possible to use a 4-pin connector. Alternatively the pins 1 to 4 ...

7. Mini-DIN connector - Wikipedia

   en.wikipedia.org/wiki/Mini-DIN_connector

   PS/2 female socket pin numbering: note that it is a mirror of the male connector. The mini-DIN connectors are a family of multi-pin electrical connectors used in a variety of applications. Mini-DIN 9.5 millimetres (3 ⁄ 8 in) is similar to the larger, older 13.2 mm diameter DIN connector.

8. Pulse-width modulation - Wikipedia

   en.wikipedia.org/wiki/Pulse-width_modulation

   Pulse-width modulation (PWM), also known as pulse-duration modulation (PDM) or pulse-length modulation (PLM), [1] is any method of representing a signal as a rectangular wave with a varying duty cycle (and for some methods also a varying period). PWM is useful for controlling the average power or amplitude delivered by an

9. Charlieplexing - Wikipedia

   en.wikipedia.org/wiki/Charlieplexing

   A symmetric layout of Charlieplexed LEDs. On left, 3 pins drive 6 LEDs arranged in a triangle. On right, 4 pins drive 12 LEDs arranged in a tetrahedron.. The Charlieplexing configuration may be viewed as a directed graph, where the drive pins are vertices and the LEDs are directed edges; there is an outward-pointing edge connected from each vertex to each other vertex, hence with n drive pins ...