Hi everybody,
I can't understand why using the same sketches for I2C master and I2C slave into two different contexts in one case MKRWIFI1010 --> ARDUINO MICRO WORKS while in the other one MKRWIFI1010 --> MKRWIFI1010 DO NOT WORK
Here below the wiring that works:
And following the wiring that DO NOT WORK:
The master and slave code is very simple and comes directly from the samples that everybody is using out there. Sorry for long comments I'm using for my reference
Master here:
// Wire Master Writer
// by Nicholas Zambetti <http://www.zambetti.com>
// Demonstrates use of the Wire library
// Writes data to an I2C/TWI slave device
// Refer to the "Wire Slave Receiver" example for use with this
// Created 29 March 2006
//integrated with Pontenziometro by Andrea Pagliari June 2022
// to add potentiometer capabilities to mkrmotorcarrier and mkr wifi1010
// to set and drive motor speed
// transmits only 1 byte and only if the change has been greater or lower than 1
// in MotorDuty which is a map of the AnalogRead which can be very noisy and therefore
// transmit changes even if the potentiometer has not been touched
// the purpose is to not continously change the receiving lcd monitor
// 02 version to send out one sigle data
//*** typical definition of PINs from Manual C "get rid of magic numbers"
// #define IOPIN10 10
// #define IOPIN11 11
// #define IOPIN7 7
// #define IOPIN13 13
// #define IOPINA0 A0
#define IOPINA1 A1 //only one used here to read potentiometer
// #define IOPIN12 12
const int POTENTIOMETER = IOPINA1;// POTENTIOMETER label is a generic one that can be semantically contextualized
int SensorValueAnalog; //value of the sensor that will be analogically read
int SensorValueAnalogPrevious; // variable to store previous value and smooth odd signals
// Wire
#include <Wire.h>
byte MotorDuty = 0; //*** varable specific to be used as duty or speed and variable transmitted by Wire
byte MotorDutyPrevious = 0; // variable used to store previous value and transmit only when there is a plus or minus 1 difference
//end of Wire
void setup()
{
//**Wire
Wire.begin(); // join i2c bus (address optional for master)
digitalWrite(SDA, 0);//added to disable internal pull up resistors
digitalWrite(SCL, 0);//added to disable internal pull up resistors
//endOfWire**
//**SensorPlatform
pinMode (POTENTIOMETER, INPUT); // pin Mode for potentiometer
//EndOfSensorPlatform**
//**SerialDebug
Serial.begin(9600);
//EndOfSerialDebug**
}
void loop()
{
SensorValueAnalog = analogRead(POTENTIOMETER);// read the input pin
MotorDuty = map(SensorValueAnalog, 0, 1023, 1, 100); // remap to M1.setDuty(int) where -100<int<100 and 0 means stop
//**SerialDebug
Serial.print("SensorValueAnalog=");
Serial.println(SensorValueAnalog);
Serial.print("Speed=");
Serial.println(MotorDuty);
//EndOfSerialDebug**
delay(50); // slight delay to stabilize the ADC
if ((MotorDuty != MotorDutyPrevious) & (MotorDuty != (MotorDutyPrevious + 1)) & (MotorDuty != (MotorDutyPrevious - 1))) { // *** CORE IF LOGIC transmits only if the analogReadvalue changed of one minus/plus
//Wire
Wire.beginTransmission(4); // transmit to device #4
Wire.write(MotorDuty); // sends one byte
Wire.endTransmission(); // stop transmitting
delay(200);
Serial.print("SENT OUT"); //debug
//EndOfWire
}
SensorValueAnalogPrevious = SensorValueAnalog; // put previous equal to current value before starting the loop again
MotorDutyPrevious = MotorDuty;
}
And SLAVE FOR ARDUINO MICRO here below:
// Wire Slave Receiver
// by Nicholas Zambetti <http://www.zambetti.com>
// Demonstrates use of the Wire library
// Receives data as an I2C/TWI slave device
// Refer to the "Wire Master Writer" example for use with this
// Created 29 March 2006
// This example code is in the public domain.
//Integrated June 2020 by Andrea Pagliari
// with LCD output capabilities
// LiquidCrystal(rs, enable, d4, d5, d6, d7)
// to monitor potentiometer run on MKR Motor carrier and show it real time on a remote LCD screen
// LCD screen is managed and controlled by additional Arduino Micro
//PINs reviewed to work with ArduinoMicro
//**Wire
#include <Wire.h>
//EndOfWire**
//**LCDScreen
#define PINRS 12
#define PINENABLE 11
#define PIND4 9
#define PIND5 6
#define PIND6 5
#define PIND7 4
#include <LiquidCrystal.h> //carica la specifica libreria
// LiquidCrystal lcd(12, 11, 5, 4, 3, 2); //versione Arduino Uno definisce quali sono i PIN di comunicazione con il monitor lcd si potrebbero sistemare come da best practice
LiquidCrystal lcd(PINRS, PINENABLE, PIND4, PIND5, PIND6, PIND7); //definisce quali sono i PIN di comunicazione con il monitor lcd si potrebbero sistemare come da best practice
//EndOfLCDScreen**
void setup()
{
//**Wire
Wire.begin(4); // join i2c bus with address #4 which is the address the master send data to
Wire.onReceive(receiveEvent); // register event
//EndOfWire**
//**LCDScreen
lcd.begin(16, 2); //dichiara che lo schermo è 16 caratteri per 2 caratteri di dimensione
//EndOfLCDScreen**
//**SerialDebug
Serial.begin(9600); // start serial for debug output
//EndOfSerialDebug**
}
void loop()
{
delay(100);
}
// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
{
lcd.clear();
int i = 0;
while (1 < Wire.available()) // loop through all but the last
{
char c = Wire.read(); // receive byte as a character
lcd.setCursor(i, 0);
lcd.print(c); // print the character
i ++;
}
int x = Wire.read(); // receive byte as an integer
lcd.setCursor(0, 1);
lcd.print(x);
Serial.print("Speed=");
Serial.println(x); // print the integer
}
WHILE SLAVE FOR ARDUINO MKRWIFI1010 mounted on IOT CARRIER is following:
// Wire Slave Receiver
// by Nicholas Zambetti <http://www.zambetti.com>
// Demonstrates use of the Wire library
// Receives data as an I2C/TWI slave device
// Refer to the "Wire Master Writer" example for use with this
// Created 29 March 2006
//Modified June2022 by Andrea Pagliari
//To use LCD Screen on Arduino Iot MKR and MKR Wifi1010
//02 version to get only a single character and print it
//**Wire
#include <Wire.h>
//EndOfWire**
//**MKRIotCarrier
int ScreenSwitch=1;
#include <Arduino_MKRIoTCarrier.h>
/* Create a carrier object */
MKRIoTCarrier carrier;
//EndOf **MKRIotCarrier
void setup()
{
//**Wire
Wire.begin(4); // join i2c bus with address #4 which is the address the master send data to
digitalWrite(SDA, 0);//added to disable internal pull up resistors
digitalWrite(SCL, 0);//added to disable internal pull up resistors
Wire.onReceive(receiveEvent); // register event
//EndOfWire**
//Initialize the MKR IoT Carrier
carrier.begin();
carrier.display.setRotation(0);
carrier.display.enableDisplay(1);
//**SerialDebug
Serial.begin(9600); // start serial for debug output
//EndOfSerialDebug**
}
void loop()
{
delay(100);
}
// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany)
{
Serial.print("EventRECEIVED");// debug
int x = Wire.read(); // receive byte as an integer
carrier.display.fillScreen(ST77XX_RED); //red background
carrier.display.setTextColor(ST77XX_WHITE); //white text
carrier.display.setTextSize(6); //medium sized text
carrier.display.setCursor(80, 100); //sets position for printing (x and y)
carrier.display.print(x); // print the integer
Serial.print("Speed=");
Serial.println(x); // print the integer
}
Any help will be higly appreciated and thanks in advance for your support!
Andrea
Think I'll first try to understand the reason why wifi 1010 is not.