Hello I have an 4 IR avoidance module and it is detecting black. Can you tell me why is that. I want to make a line follower car whit these if I can. Please help
Thank you
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(Hint: we're not all interested in your timescales, your desires or your emotions.)
ok so I have an 4 IR avoidance module like this one: https://www.amazon.com/4-Channel-Infrared-Follower-Obstacle-Avoidance/dp/B07662JJF7
and even its detecting every object i put in front of it even if the object is black or white. Shouldn't it detect only the white object ?
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I just want to know why do the sensors detect black when they are IR and black should absorb the light
How do you know this?
(Also: IR is not always like visible. Instinct doesn't always work for you.)
If no light is reflected, "black" is detected by the fact that no light is reflected.
Because i have tested it whit a program that detects if an object is placed in front of the sensor. Whit every black object it detects it and i do not know why
Can't see it.
Sorry.
An object that appears black in visible light may reflect IR very well.
Or, you have a program error or wiring error.
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void setup() {
Serial.begin(9600);
pinMode(SENSOR_PIN, INPUT);
}
void loop() {
int state = digitalRead(SENSOR_PIN);
if (state == LOW){
Serial.println("The obstacle is present");
}else{
Serial.println("The obstacle is NOT present");
}
delay(100);
}
Even is a dark room it sill detects it
Please post a complete, compilable program.
const int SENSOR_PIN = 2;
void setup() {
Serial.begin(9600);
pinMode(SENSOR_PIN, INPUT);
}
void loop() {
int state = digitalRead(SENSOR_PIN);
if (state == LOW){
Serial.println("The obstacle is present");
}else{
Serial.println("The obstacle is NOT present");
}
delay(100);
}
Now, a wiring diagram and specifications or links to specifications of all your hardware.
I made it easier to read:
const int SENSOR_PIN = 2;
void setup() {
Serial.begin(9600);
pinMode(SENSOR_PIN, INPUT);
}
void loop() {
int state = digitalRead(SENSOR_PIN);
if (state == LOW) {
Serial.println("The obstacle is present");
}
else {
Serial.println("The obstacle is NOT present");
}
delay(100);
}
Which message does it print?
the IR sensor module: https://www.amazon.com/4-Channel-Infrared-Follower-Obstacle-Avoidance/dp/B07662JJF7
the arduino : Arduino Uno Rev3 — Arduino Official Store
Then the sensor appears to be working correctly!
1 Like
It prints The obstacle is present even if i put a black object in front of it
Are those objects reflective? Have you tried adjusting the sensitivity potentiometers on the board?
"black" does not mean "invisible".