[Arduino code for KC868-A32 Pro]-01 Control relay by XL9535

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Code:

#include <PCA95x5.h>

PCA9555 ioex;

void setup() {
    Serial.begin(115200);
    delay(100);

    Wire.begin(11,10,100000);
    ioex.attach(Wire,0x21);
    ioex.polarity(PCA95x5::Polarity::ORIGINAL_ALL);
    ioex.direction(PCA95x5::Direction::OUT_ALL);
    ioex.write(PCA95x5::Level::H_ALL);
    delay(2000);
}

void loop() {
    for (size_t i = 0; i < 16; ++i) {
        Serial.print("set port low: ");  //turn ON relay
        Serial.println(i);

        ioex.write((PCA95x5::Port::Port)i, PCA95x5::Level::L);
        Serial.println(ioex.read(), BIN);
        delay(500);
    }

    for (size_t i = 0; i < 16; ++i) {
        Serial.print("set port high: "); //turn OFF relay
        Serial.println(i);

        ioex.write((PCA95x5::Port::Port)i, PCA95x5::Level::H);
        Serial.println(ioex.read(), BIN);
        delay(500);
    }
}

source code download:

  XL9535_output.zip (Size: 492 bytes / Downloads: 16)

before use XL9535 chip, you need to install PCA95x5 arduino library: