I initially gave this product a 1 star rating because it didn’t look like the one in the image nor did it work the same. After contacting the company I found out that there are 2 versions, one is the Green PCB (shown in product image), and the other is a Red PCB (the one I received). They are the same product, though with one slight difference, the order the digits display. The Green PCB displays the digits in reverse order 4, 3, 2, 1 and the red PCB displays as digit 1, 2, 3, 4 – Green PCB digitalWrite(latchPin, LOW); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[d]); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[c]); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[b]); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[a]); digitalWrite(latchPin, HIGH); Red PCB digitalWrite(latchPin, LOW); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[a]); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[b]); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[c]); shiftOut(dataPin, clockPin, LSBFIRST, LED_SEG_TAB[d]); digitalWrite(latchPin, HIGH); The module is an excellent display for lots of Arduino projects, it is cheap, clear to read and has an enclosure. Would highly recommend!
