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Hall Sensor Magnetic Module Field Detecting...
Hall Sensor Magnetic Module Field Detecting Electronic brick
Design a clock, timer or counter into your next project using this pretty 4-digit seven-segment display. These bright crisp displays are good for adding numeric output. Besides the four 7-segments, there are decimal points on each digit and an extra wire for colon-dots in the center (good for time-based projects) and a top right hand dot which could be used to indicated a °(degree) symbol for temperature feedback.
These displays are multiplexed, Common Anode. What that means it that you can use a 74HC595 or other ways to control it easily.