Expansion Board I2C Communication Control 16 IO Ports PCF8575TS For Arduino
2,06 €
Have you run out of I/O pins?. 1 Pc x Expander Module. Open-drain interrupt output pin for input change interrupt. Onboard 3.3V level converter circuit, if you do not solder VCC-VDD pad, the PCF8575 level is 3.3V.
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