Review on Tegg 1PC 4x4 Keypad MCU Board Matrix Array Switch Tactile Keypad 16 Button for Arduino - Ultimate Keypad Solution by Luke Hodes

Due to a lack of product information, it was very difficult to determine the correct pinout for this keyboard. After taking the keyboard apart, I found that the pinout is completely different than the more popular membrane keyboards. Looking at the keyboard from the front, the pinout is from left to right: C1 C2 C3 C4 R1 R2 R3 R4 (mostly columns and rows are swapped). Works well and feels good now that I figured out the pinout. It would be nice if this information was printed on the circuit board or mentioned on the website. Otherwise I would give this keyboard 5 stars.