Review on GeeekPi 2Pack MAX7219 8x32 Dot Matrix MCU 4-in-1 LED Display Module for Arduino & Raspberry Pi - Red Color by Lisa Jones
Inverted text Arduino
These modules work great and are very affordable. BUT, if you use them with Arduino and the popular MD_PAROLA library, you have to be aware that the hardware settings have to be adjusted. In the example sketches for the Parola library, see the line #define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW. Replace "PAROLA_HW" with "FC16_HW" for this display to work properly. It took an hour to dig into google to figure it out, five stars otherwise.
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