PCF8575 I2C IO Extension Shield Modul 16 I/O Port Expander für Arduino PI
1,77 €
Have you run out of I/O pins?. Onboard 3.3V level converter circuit, if you do not solder VCC-VDD pad, the PCF8575 level is 3.3V. 1 Pc x Expander Module. Open-drain interrupt output pin for input change interrupt.
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