ESP8266_Shield_Nano_gravitech

ESP8266_Shield_Nano.ino

/*Example CMMC ESP8266*/
#include "Wire.h" // enable I2C bus
byte saa1064 = 0x70 >> 1; // define the I2C bus address for our SAA1064 (pin 1 to GND)
int digits[17] = {
  63, 6, 91, 79, 102, 109, 125, 7, 127, 111, 119, 124, 57, 94, 121, 113, 0
};
// these are the byte representations of pins required to display each digit 0~9 then A~F, and blank digit
int sensorPin = A0;
int sensorValue = 0;

void setup()
{
  Wire.begin(); // start up I2C bus
  delay(500);
  initDisplay();
  pinMode(15, OUTPUT); //direction
  pinMode(16, OUTPUT); //pwm
}
void initDisplay()
// turns on dynamic mode and adjusts segment current to 12mA
{
  Wire.beginTransmission(saa1064);
  Wire.write(B00000000); // this is the instruction byte. Zero means the next byte is the control byte
  Wire.write(B01000111); // control byte (dynamic mode on, digits 1+3 on, digits 2+4 on, 12mA segment current
  Wire.endTransmission();
}
void clearDisplay()
{
  Wire.beginTransmission(saa1064);
  Wire.write(1); // start with digit 1 (right-hand side)
  Wire.write(0); // blank digit 1
  Wire.write(0); // blank digit 2
  Wire.write(0); // blank digit 3
  Wire.write(0); // blank digit 4
  Wire.endTransmission();
}
void displayInteger(int num, int zero)
// displays the number 'num'
// zero = 0 - no leading zero
// zero = 1 - leading zero
{
  int thousand, hundred, ten, one;
  // breakdown number into columns
  thousand = num / 1000;
  hundred = (num - (thousand * 1000)) / 100;
  ten = (num - ((thousand * 1000) + (hundred * 100))) / 10;
  one = num - ((thousand * 1000) + (hundred * 100) + (ten * 10));
  if (zero == 1) // yes to leading zero
  {
    Wire.beginTransmission(saa1064);
    Wire.write(1);
    Wire.write(digits[one]);
    Wire.write(digits[ten]);
    Wire.write(digits[hundred]);
    Wire.write(digits[thousand]);
    Wire.endTransmission();
    delay(10);
  }
  else if (zero == 0) // no to leading zero
  {
    if (thousand == 0) {
      thousand = 16;
    }
    if (hundred == 0 && num < 100) {
      hundred = 16;
    }
    if (ten == 0 && num < 10) {
      ten = 16;
    }
    Wire.beginTransmission(saa1064);
    Wire.write(1);
    Wire.write(digits[one]);
    Wire.write(digits[ten]);
    Wire.write(digits[hundred]);
    Wire.write(digits[thousand]);
    Wire.endTransmission();
    delay(10);
  }
}
void loop()
{
  sensorValue = analogRead(sensorPin) - 168;
  digitalWrite(15, HIGH);
  analogWrite(16, 1023);
  displayInteger(sensorValue, 1);
  delay(200);

}