ESP8266 Community Forum

Posted: **Mon Apr 18, 2016 6:17 am**

Hello,

In the project that I'm currently pursuing, I have a D1 Mini that I am using as a master for I2C communications, while the ATtiny is the slave. I am using a 4x3 matrix keypad on the ATtiny and sending the entered keys via I2C.

In this case, the D1 Mini constantly asks the ATtiny for a bit, and waits for the bits between 0 to 9.

However, after a few (random number, sometimes 35, sometimes 105, sometimes 170) entries are sent, ATtiny stops transmitting. I see a repeated string of 'Byte requested.' on the serial of the master without any byte being received.

I can't figure out what's happening and would really appreciate some help to solve this problem.

Thanks, in advance!

Master code:

Code: Select all

#include <Wire.h>

#define S1_ADDR 0x14

int buzzPin = 5; //Buzzer D1

int keyent = 0;
int keycount = 0;
int keytries = 0;

void setup()
{
  Serial.begin(115200);
  Wire.begin(0, 2); //D3, D4
  Serial.println("");
  Serial.println("Door module.");
  pinMode(buzzPin, OUTPUT);
}

void loop()
{
  keyReq();
  delay(150);
  if(keycount == 4)
  {
    longBuzz();
    keytries++;
    Serial.println("Key obtained.");
    Serial.println(keyent);
    keycount = 0;
    keyent = 0;
  }
}

//Key request function
void keyReq()
{
  Serial.println("Byte requested.");
  Wire.requestFrom(S1_ADDR, 1);
  if(Wire.available())
  {
    byte byteReceived = Wire.read();
    Serial.println(byteReceived);
    if(byteReceived < 10)
    {
      //Serial.println(byteReceived);
      keyent = keyent * 10 + byteReceived;
      blinkBuzz();
      Serial.println(keyent);
      keycount++;
    }
  }
}

//Buzzer short beep
void blinkBuzz()
{
  digitalWrite(buzzPin, HIGH);
  delay(50);
  digitalWrite(buzzPin, LOW);
  delay(50);
}

Slave code:

Code: Select all

#include "TinyWireS.h"

#define SLAVE_ADDR 0x14

//byte byteToSend = 0;

int r1=0;
int r2=1;
int r3=4;
int r4=5;

int c1=6;
int c2=7;
int c3=8;

int i = 33;
void setup()
{
  TinyWireS.begin(SLAVE_ADDR);
  TinyWireS.onRequest(requestEvent);
  
  pinMode(r1,OUTPUT);
  pinMode(r2,OUTPUT);
  pinMode(r3,OUTPUT);
  pinMode(r4,OUTPUT);

  pinMode(c1,INPUT);
  pinMode(c2,INPUT);
  pinMode(c3,INPUT);
  
}
void loop()
{
  digitalWrite(c1,HIGH);
  digitalWrite(c2,HIGH);
  digitalWrite(c3,HIGH);
  
  //checking everything one by one
  //case 1: row1 =0 while other rows are 1
  digitalWrite(r1,LOW);
  digitalWrite(r2,HIGH);
  digitalWrite(r3,HIGH);
  digitalWrite(r4,HIGH);
  //checking each column for row1 one by one
  if(digitalRead(c1)==0)
  {
    i = 1;
  }
  else if(digitalRead(c2)==0)
  {
    i = 2;
  }
  else if(digitalRead(c3)==0)
  {
    i = 3;
  }
  
  //case 2: row2 =0 while other rows are 1
  digitalWrite(r1,HIGH);
  digitalWrite(r2,LOW);
  digitalWrite(r3,HIGH);
  digitalWrite(r4,HIGH);
  //checking each column for row1 one by one
  if(digitalRead(c1)==0)
  {
    i = 4;
  }
  else if(digitalRead(c2)==0)
  {
    i = 5;
  }
  else if(digitalRead(c3)==0)
  {
    i = 6;
  }  
  //case 3: row3 =0 while other rows 1
  digitalWrite(r1,HIGH);
  digitalWrite(r2,HIGH);
  digitalWrite(r3,LOW);
  digitalWrite(r4,HIGH);
  //checking each column for row1 one by one
  if(digitalRead(c1)==0)
  {
    i = 7;
  }
  else if(digitalRead(c2)==0)
  {
    i = 8;
  }
  else if(digitalRead(c3)==0)
  {
    i = 9;
  }
  //case 4: row4 =0 while other rows are 1
  digitalWrite(r1,HIGH);
  digitalWrite(r2,HIGH);
  digitalWrite(r3,HIGH);
  digitalWrite(r4,LOW);
  //checking each column for row4 one by one
  if(digitalRead(c1)==0)
  {
    i = 11;
  }
  else if(digitalRead(c2)==0)
  {
    i = 0;
  }
  else if(digitalRead(c3)==0)
  {
    i = 12;
  }
  //giving delay between keypress
  delay(50);
  TinyWireS_stop_check();  
}
void requestEvent()
{
  TinyWireS.send(i);
  i=33;
}

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