The circuit is extremely simple, comprising the sensor, an Arduino Nano, and an OLED display. This device is handy because its voltage output has a known relationship to the gauss level the sensor ...
But 0.96″ OLED displays are not, and neither are SMD tactile ... The brains of the operation is an Arduino Pro Micro, which addresses each screen individually via two 74HC4051 mux ICs.
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