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In this project we see how to build a measuring wheel designed to be used over distances where rulers and tape measures are no longer practical. Even if it uses a rotary encoder with only 20 steps per revolution it can still provide good quality results by measuring, for example, the size of a room. The final design chosen is very compact, there is no exposed wiring, and an easy-to-read OLED display shows both metric and imperial measurements.
The system is controlled by the ATtiny1614 microprocessor; it uses very little power when in sleep mode. The rotary encoder contains two sets of contacts which can create noise resulting in erroneous readings. We have added an RC network and Schmitt trigger between each contact and the microprocessor in order to remove any noise generated by the contacts and provide clean signals to the microprocessor. The results are precise and accurate readings. The circuit is powered by a 3.7V 120mA LIPO battery.