TachoPin

TachoPin is a compact electronic interface designed to convert engine tachometer signals into standardized digital data for instrumentation, data logging, and control systems. It is used in automotive dashboards, industrial machines, and hobbyist projects to provide reliable RPM measurements and timing signals.

The device accepts common tachometer signal formats, including open-collector or push-pull square waves, as well as analog voltage proportional to speed. Inside, it performs signal conditioning, isolation, and frequency-to-digital conversion. Most implementations offer multiple output options, such as a pulse train synchronized to RPM, a UART/I2C/SPI data stream, or a PWM signal for downstream systems. It typically features galvanic isolation to protect host electronics, a wide supply voltage range (for example 5–48 V), and adjustable sensitivity or debounce filtering.

Design variants include standalone modules and pin-compatible interfaces designed to plug into microcontroller projects. Calibration procedures may involve setting tach scale, counting pulses per revolution, or configuring sampling rate. Typical applications include engine control units, diagnostic tools, and data-logging devices where precise RPM measurement is required.

History and usage: The term TachoPin refers to a generic interface rather than a single manufactured product. It originated as part of efforts to standardize tachometer signal handling in multi-vendor automotive kits. In practice, developers implement TachoPin-compatible interfaces using off-the-shelf components.