I have a problem with my code , it say "ReadDistance" was not declared in this scope. I dont understand , i tried put " int x; " but didnt work.
Can someone help , I have to make a presentation for my project next week bruhhh
#include <Wire.h>
unsigned char ok_flag;
unsigned char fail_flag;
unsigned short lenth_val = 0;
unsigned char i2c_rx_buf[16];
unsigned char dirsend_flag=0;
const int echoPin = 2;
const int trigPin = 3;
const int buzzer1 = 4;
const int buzzer2 = 5;
const int ledRed = 8;
const int ledYellow = 9;
const int ledGreen = 10;
const int relay = 11;
void setup() {
Wire.begin();
Serial.begin(9600,SERIAL_8N1);
printf_begin();
}
void loop() {
int x=ReadDistance();
Serial.print(x);
Serial.println(" mm");
}
int serial_putc( char c, struct __file * )
{
Serial.write( c );
return c;
}
void printf_begin(void)
{
fdevopen( &serial_putc, 0 );
}
if (x <=30 && x >20 )
{
digitalWrite(10,HIGH);
}
else if (x <= 20 && x >10)
{
digitalWrite(10,LOW);
digitalWrite(buzzer1,HIGH);
digitalWrite(9,HIGH);
}
else if(x <=10)
{
digitalWrite(buzzer1,LOW);
digitalWrite(9,LOW);
digitalWrite(buzzer2,HIGH);
digitalWrite(8,HIGH);
digitalWrite(11,HIGH);
}
else
{
digitalWrite(buzzer2,LOW);
digitalWrite(8,LOW);
digitalWrite(11,LOW);
}
delay (100);
}
void SensorRead(unsigned char addr,unsigned char* datbuf,unsigned char cnt)
{
unsigned short result=0;
// step 1: instruct sensor to read echoes
Wire.beginTransmission(82); // transmit to device #82 (0x52)
// the address specified in the datasheet is 164 (0xa4)
// but i2c adressing uses the high 7 bits so it's 82
Wire.write(byte(addr)); // sets distance data address (addr)
Wire.endTransmission(); // stop transmitting
// step 2: wait for readings to happen
delay(1); // datasheet suggests at least 30uS
// step 3: request reading from sensor
Wire.requestFrom(82, cnt); // request cnt bytes from slave device #82 (0x52)
// step 5: receive reading from sensor
if (cnt <= Wire.available()) { // if two bytes were received
*datbuf++ = Wire.read(); // receive high byte (overwrites previous reading)
*datbuf++ = Wire.read(); // receive low byte as lower 8 bits
}
}
int ReadDistance(){
SensorRead(0x00,i2c_rx_buf,2);
lenth_val=i2c_rx_buf[0];
lenth_val=lenth_val<<8;
lenth_val|=i2c_rx_buf[1];
delay(300);
return lenth_val;
}