Universal I²C Bus Isolator and Level Shifter

When you want to connect two or more I2C devices together there may, in some cases, be the requirement to change the voltage level of the signals. And while you're at it, it may not be such a bad idea to build in galvanic isolation at the same time.

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Here’s a non-invasive, all electronic add-on to display the running speed (rpm) of your lathe or milling machine, be it CNC or vintage. It’s state of the art—witness the use of an Arduino Micro board and a .96 inch OLED display for instantaneous readout. The little instrument also has a clock displaying the equipment running time.