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