Widget of the Week #4: 8 x 7-segment display MAX7219

A quick one this week after last week’s marathon. Projects often need a few digits of numeric display – from thermometers to clocks these eight digit displays are a cheap and easy-to-use solution.  Commonly known as MAX7219 but that doesn’t refer to the display at all but the multiplexer chip that drives the LEDs from a serial input.  It’s also found in 8×8 matrix displays that we’ll come back to in another WotW. At a current price of around a pound you can pair one with a NodeMCU to make an NTP synchronised clock accurate to fractions of a second for…

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