Recently, we published an entry-level Arduino project ... compact common-cathode module containing four 7-segment LED numeric displays. Each segment in the display module is multiplexed, meaning it ...

As the 7-segments display components have eight independent LEDs (seven for the bars and one extra for the point), every segment ... happens when you connect the VCC common anode of the board to one ...

With multi-segment displays ... Arduino world; the segments need +1.5 volts with reference to the common connection to turn on, and -1.5 volts to turn off. His clever solution is to use an Arduino ...

With multi-segment displays ... Arduino world; the segments need +1.5 volts with reference to the common connection to turn on, and -1.5 volts to turn off. His clever solution is to use an Arduino ...

This is what it looks like in action: My model uses the car's OBD-II port to connect to an Arduino microcontroller, which is programmed to display the car's speed on a 7-segment display.