Help as I was trying to apply what I have learned reading about millis(). I have encountered this problem that even the if statement is not true parts of logic is being executed here is my code.
#define trig_1 2
#define echo_1 3
#define trig_2 4
#define echo_2 5
int interval(5000);
float d_1, d_2;
int control1 = 0, control2 = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
unsigned long currentMillis = millis();
long sensor1_Time;
sensor(trig_1, echo_1, d_1);
delay(30);
sensor(trig_2, echo_2, d_2);
delay(30);
if(d_1 <= 12)
{
sensor1_Time = currentMillis;
control1 = 1;
}
Serial.print(currentMillis);
Serial.print(" sensor time: ");
Serial.print(sensor1_Time);
Serial.print(" control1: ");
Serial.println(control1);
}
void sensor(int trig, int echo, float &distance)
{
float duration;
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delay(5);
digitalWrite(trig, LOW);
duration = pulseIn(echo, HIGH);
distance = (0.013464 * duration) / 2; //distance in inches
}
once I try uploading the code, from the if statement "if(d_1 <= 12)" even if it is not true "control1 = 1" is executed. resulting to this in the serial monitor
0 sensor time: 0 control1: 1
1453 sensor time: 0 control1: 1
1549 sensor time: 0 control1: 1
1645 sensor time: 0 control1: 1
1741 sensor time: 0 control1: 1
1838 sensor time: 0 control1: 1
1934 sensor time: 0 control1: 1
2030 sensor time: 0 control1: 1
2126 sensor time: 0 control1: 1
2223 sensor time: 0 control1: 1
Initially control1 = 0 but here as you can see even the if statement is not true control1 value is changed to 1. When I tried making the if statement true the following are the result from the serial monitor
9195 sensor time: 9195 control1: 1
9282 sensor time: 9195 control1: 1
9378 sensor time: 9195 control1: 1
9475 sensor time: 9195 control1: 1
You can see here that the if statement is working properly because when it became true the currentMillis values are stored in the sensor1_Time variable. My problem is that the "control1" value is changed even when the if statement is false can anyone help me with this so that I can continue trying what I have started? Thanks.
