Combine 2 programs (Sensor + display on I2C LCD)

Projects Programming
1

Hello everyone !!

I have 1 Ultrasonic Range Finder SRF10 (SRF10 Ultra sonic range finder) and a I2C LCD ( I2C_TWI_LCD1602_Module__SKU__DFR0063_-DFRobot ).
They're connect with a arduino card (confirm by my teacher)

I have found 2 programs (one for the sensor, one for the LCD. They independently work, but I don't know how to connect them, to display the altitude on the LDC screen.
Here my programs :

Sensor :

#include <Wire.h>

void setup()
{
   Wire.begin();                // join i2c bus (address optional for master)
   Serial.begin(9600);          // start serial communication at 9600bps
}

int reading = 0;

void loop()
{
   // step 1: instruct sensor to read echoes
   Wire.beginTransmission(112); // transmit to device #112 (0x70)
                                // the address specified in the datasheet is 224 (0xE0)
                                // but i2c adressing uses the high 7 bits so it's 112
   Wire.write(byte(0x00));      // sets register pointer to the command register (0x00)  
   Wire.write(byte(0x51));      // command sensor to measure in "inches" (0x50) 
                                // use 0x51 for centimeters
                                // use 0x52 for ping microseconds
   Wire.endTransmission();      // stop transmitting

   // step 2: wait for readings to happen
   delay(70);                   // datasheet suggests at least 65 milliseconds

   // step 3: instruct sensor to return a particular echo reading
   Wire.beginTransmission(112); // transmit to device #112
   Wire.write(byte(0x02));      // sets register pointer to echo #1 register (0x02)
   Wire.endTransmission();      // stop transmitting

   // step 4: request reading from sensor
   Wire.requestFrom(112, 2);    // request 2 bytes from slave device #112

   // step 5: receive reading from sensor
   if(2 <= Wire.available())    // if two bytes were received
   {
     reading = Wire.read();  // receive high byte (overwrites previous reading)
     reading = reading << 8;    // shift high byte to be high 8 bits
     reading |= Wire.read(); // receive low byte as lower 8 bits
     Serial.println(reading);   // print the reading
   }

   delay(250);                  // wait a bit since people have to read the output :)

LCD

#include <Wire.h>
#include <BMP085.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
 
// Define LCD Pins
#define BACKLIGHT_PIN     3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7
 
// Initialize LiquadCrystal with pin setup
LiquidCrystal_I2C lcd(0x20,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
 
// Initialize BMP085 

 
void setup() {    
 
 
  lcd.begin(16,2);
 
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
 
}
 
void loop() {
 

 
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Hello");
  lcd.setCursor(0,1);
  lcd.print("Mister");
  
  delay(100);
}

Can you help me please ??

2

Merge the two setup () functions, then take all the code in loop() from the sonar sketch and make it a function returning a range.

3

Thank you for your fast answer !
How can I "make it a function returning a range" ?

4 
int rangeInCm()
{
   Wire.beginTransmission(112);
   Wire.write(0);
   Wire.write(0x51);      // command sensor to measure in "inches" (0x50) 
                                // use 0x51 for centimeters
                                // use 0x52 for ping microseconds
   Wire.endTransmission();

   delay(70);

   Wire.beginTransmission(112);
   Wire.write(byte(0x02));
   Wire.endTransmission();

   Wire.requestFrom(112, 2);

   if(Wire.available() >= 2)
   {
     int reading = Wire.read();
     reading = reading << 8;
     reading |= Wire.read();
     return reading;   
   }
   else
     return -1;  // something went wrong
}

((uncompiled, untested)
Of course, that delay will prevent you doing other things, but you may not have other stuff to do.

5

Okay thank you. Now, the LDC is empty, the altitude is not display ...
Here the final program :

LCD :

#include <Wire.h>
#include <BMP085.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
 
// Define LCD Pins
#define BACKLIGHT_PIN     3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7
 
// Initialize LiquadCrystal with pin setup
LiquidCrystal_I2C lcd(0x20,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
 
// Initialize BMP085 

 
void setup() {    
 
 
  lcd.begin(16,2);
 
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
    Wire.begin();                // join i2c bus (address optional for master)
   Serial.begin(9600);          // start serial communication at 9600bps
}
 
void loop() {
 
  lcd.clear();
  lcd.setCursor(0,0);
  rangeInCm();
  delay(100);
}

Sensor :

#include <Wire.h>


int reading = 0;


 int rangeInCm()
{
   Wire.beginTransmission(112);
   Wire.write(0);
   Wire.write(0x51);      // command sensor to measure in "inches" (0x50) 
                                // use 0x51 for centimeters
                                // use 0x52 for ping microseconds
   Wire.endTransmission();

   delay(70);

   Wire.beginTransmission(112);
   Wire.write(byte(0x02));
   Wire.endTransmission();

   Wire.requestFrom(112, 2);

   if(Wire.available() >= 2)
   {
     int reading = Wire.read();
     reading = reading << 8;
     reading |= Wire.read();
     return reading;   
   }
   else
     return -1;  // something went wrong
}

Can you see an error ?

6

Yes, you're not displaying the value returned be the ranging function.

7

Hmm ok what can I do to resolve that ? (Sorry I'm beginner ...)

8

rangeInCm returns an int, so try doing something with that.