The forward voltage of the segments is slightly high – the datasheet specifies between 7.4V and 10V. There are many methods to reduce the number of GPIOs needed further than this, but the chosen microcontroller does not have a shortage of GPIO for this application. Arduino and LED strip must both be supplied with 5V power source so we know which voltage is needed. I’ve chosen to use plain display multiplexing, requiring one GPIO for each digit common anode, and one GPIO for each segment – with the colon separators, that gives 7 common anodes, and 8 cathodes with the decimal places and colons commoned together.
To reduce the number of GPIO used to drive the display, various methods can be used – such as multiplexing, shift registers or dedicated display drivers. The 7 segment displays are common anode displays, with segments consisting of four red LEDs in series and the decimal places consisting of two red LEDs in series. Arduino Tutorial Online Courses Video Training.
#Arduino led clock pdf
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