Expansion Board I2C Communication Control 16 IO Ports PCF8575TS For Arduino

Are the I / O pins exhausted?. Nano Sheild. OLED LED&RGB. Am 16.10.20 hat der Verkäufer die folgenden Angaben hinzugefügt On board 3.3V level converter circuit, if you don't solder pad of VCC-VDD, the PCF8575 level is 3.3V.

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