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All channels low prior to initialize #1

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All channels low prior to initialize #1

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32 changes: 19 additions & 13 deletions Particle/PCA9536_R11.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -16,19 +16,25 @@ void setup()
Particle.variable("i2cdevice", "PCA9536_R11");

// Initialise I2C communication
Wire.begin();
// Initialise Serial Communication, set baud rate = 9600
Serial.begin(9600);

// Start I2C transmission
Wire.beginTransmission(Addr);
// Select configuration register
Wire.write(0x03);
// Set all pins as OUTPUT
Wire.write(0x00);
// Stop I2C transmission
Wire.endTransmission();
delay(300);
- Wire.begin();
// Initialise Serial Communication, set baud rate = 9600
Serial.begin(9600);
+
+ // Turn off all channels prior to initialization of chip so relays do not turn on after initializing channels to outputs.
+ Wire.beginTransmission(Addr);
+ Wire.write(0x01);
+ Wire.write(0x00);
+ Wire.endTransmission();

- // Start I2C transmission
Wire.beginTransmission(Addr);
// Select configuration register
Wire.write(0x03);
// Set all pins as OUTPUT
Wire.write(0x00);
- // Stop I2C transmission
Wire.endTransmission();
delay(300);
}

void loop()
Expand Down