Abstract: This paper presents an automated robotic arm designed for sorting of objects into metals and non-metal base on their weight. The system is controlled by an FX3U-32M PLC and an Arduino Mega ...
The PCB must be mounted floated, otherwise key presses don't work reliable. Connect pins 3 and 4 on connector P1 for 16-pin button mode. Smaller keypads with less pins may work, but are not tested.
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