A contactless RPM (revolutions per minute) meter
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README.md
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README.md

mRPM

Maarten's RPM (Revolutions Per Pinute) meter.

Introduction

This project describes how to make a RPM (revolutions per minute) meter. It uses an ESP8266, a 4 element 8x8 LED matrix and a line tracking sensor. Jan Ridders of Jan Ridders Modelbouw requested this project. He needs to measure the speed of his Stirling, steam or combustion engines. The ESP8266 was chosen because it is easy, cheap and known to Maarten; this project does not (yet?) use the WiFi capabilities of the ESP8266.

Demo

See YouTube for a demo of the project.

Components

The following components are used in the project, total cost below $10.

Wiring

For wiring information (power, schematics, photos) refer to the wiring directory.

Software

The software (firmware inside the ESP8266) is available as binary, and can be flashed relatively easy. Another option is to install the development environment (compiler) and work from the source; refer to the arduino directory.

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