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arduino-cli/libraries/PCF8591/examples/analogReadWriteEsp32SecondI2C/analogReadWriteEsp32SecondI2C.ino

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+/*
+ * 	PCF8591 Analog Port Expand
+ *  Read all analog pins and write value on analog ouput
+ *
+ *  by Mischianti Renzo <http://www.mischianti.org>
+ *
+ *  https://www.mischianti.org/2019/01/03/pcf8591-i2c-analog-i-o-expander/
+ *
+ *
+ * PCF8574    ----- Esp32
+ * A0         ----- GRD
+ * A1         ----- GRD
+ * A2         ----- GRD
+ * SDA        ----- 21
+ * SCL        ----- 22
+ *
+ *
+ */
+#include "Arduino.h"
+
+#include "PCF8591.h"
+#define PCF8591_I2C_ADDRESS 0x48
+
+// Instantiate Wire for generic use at 400kHz
+TwoWire I2Cone = TwoWire(0);
+// Instantiate Wire for generic use at 100kHz
+TwoWire I2Ctwo = TwoWire(1);
+
+// Set i2c address
+//PCF8591 pcf8591(&I2Ctwo, PCF8591_I2C_ADDRESS);
+ PCF8591 pcf8591(&I2Ctwo, 0x20, 21, 22);
+
+void setup()
+{
+	Serial.begin(115200);
+	I2Cone.begin(16,17,400000); // SDA pin 16, SCL pin 17, 400kHz frequency
+
+	pcf8591.begin();
+}
+
+void loop()
+{
+	PCF8591::AnalogInput ai = pcf8591.analogReadAll();
+	Serial.print(ai.ain0);
+	Serial.print(" - ");
+	Serial.print(ai.ain1);
+	Serial.print(" - ");
+	Serial.print(ai.ain2);
+	Serial.print(" - ");
+	Serial.println(ai.ain3);
+
+	delay(3000);
+
+	int ana = pcf8591.analogRead(AIN0);
+	Serial.print("AIN0 --> ");
+	Serial.println(ana);
+
+	ana = pcf8591.analogRead(AIN1);
+	Serial.print("AIN1 --> ");
+	Serial.println(ana);
+
+	ana = pcf8591.analogRead(AIN2);
+	Serial.print("AIN2 --> ");
+	Serial.println(ana);
+
+	ana = pcf8591.analogRead(AIN3);
+	Serial.print("AIN3 --> ");
+	Serial.println(ana);
+	delay(3000);
+
+	pcf8591.analogWrite(0);
+	delay(3000);
+	pcf8591.analogWrite(128);
+	delay(3000);
+	pcf8591.analogWrite(255);
+	delay(3000);
+}