The Max7219 works on in synchrony with the microcontroller it isĬonnected to on a clock signal. Digit 0 on the Max7219Ĭonnects to pin 12 on the 4-digit LED display, which is D1. Just like with the segment connections, the digits on the Max7219 connect to the corresponding digits on the 7 segment LED display. To C and so on until you connect all the way to Seg G and DP. So Seg A connects to the A pin on the 7 segment LED display. This helps filter out noise from the power supply and to makeĪll of the seg pins connect to the corresponding segment on the 7-segment LED display. Includes a 100nF capacitor and a 10μF capacitor. ![]() We connect 2 capacitors in parallel to ground. So we connect V+, pin 19, to 5V and the ground pins, pin 4Īnd 9, to ground. ![]() The Max7219 pinout should make a lot more sense now. 8 of the pins are for the 8 LEDs on a 7 segment display, which includes A-G and DP (decimal point). A 4-digit 7-segment LED display has 12 pins.
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