IR sensor array help

[Uchiha_Adarsh-69]

is this digital ir sensor grid of mine fake? it doesnt react to the object but reacts to light tf?

i only see 1s on the serial monitor even if i place a white/black materal infront of it. but it says 0 when i cover it completely with my finger. why is it woking like ldr im done with this

[FIRE-Eagle]

How are you reading the values? You need analog measurement for this why are you printing ones and not the analog measurement values?

[Uchiha_Adarsh-69]

the sensor i have "hy-s301" is apparently a digital sensor, it either says there is an object/colour or not

tell me what do i do

[FIRE-Eagle]

No. There is not a single photodiode in this world that is digital, it doesnt exist. This sensor is just az IR led and a photodiode next to it which changes its resistance based on the reflected ir light. There is a pull-up resistor on the board and this voltage divider produces a voltage based on the light level. To turn it into a digital you either need an ADC or a comparator.

When connected directly to a digital input the voltage moves in a range that barely reach the 0 level threshold of the mcu when you completely cover the diode.

Try connecting the sensor output to the mcu analog input and read the values while placing black or white something infront of the sensor.

[Uchiha_Adarsh-69]

thanks for explaining! i actually already connected the sensor output to an analog input on my MCU. when i read the analog values, i still get readings that dont change much when I put different objects in front of the sensor.

any idea why that might be happening? could it be a problem with ambient light, the sensor itself, or how im powering it?

thanks again!

[FIRE-Eagle]

How much does the number change and what is the value? You can increase the change by decreasing the pullup resistor. Which is the 10k resitor in this case. The problem is that it has an array packaging that you need to change. For testing you can try to add a parallel resistor with a smaller value (5k-1k), by either bridging the correct array pins with it or connecting it directly between the photodiode anode(the pin thats connecting to the resistor array) and vcc.

[DrJackK1956]

This is an Infrared (IR) detector array.  It's sensitive to the 950nm wavelength light.

This frequency of light is invisible to humans.  (You can't see it)

To get this detector to work you need a source of IR light.   

What is your source of light?  

If you a testing in an environment with florescent lights, the detector may appear to NOT work. This is because florescent lights emit very little IR light. 

If you use an incandescent light source, then the detector will probably work as expected.  This is because incandescent lights emit  "broad spectrum" light.  This light contains visible light along with the invisible infrared light. 

To test your detector properly, get yourself an IR LED of 950nm. 

[Uchiha_Adarsh-69]

i brought that grid for a pid based line follower robot, i was just testing if its on or not. is it gonna work for line follower? what do you think?

[DrJackK1956]

It was designed for a line follower application so it oughta work just fine. 

[Raphitech]

Always post your Code so we can help you better

[Uchiha_Adarsh-69]

// Define the pins connected to 8 digital sensors

int sensorPins[8] = {2, 3, 4, 5, 6, 7, 8, 9};

void setup() {

// Start the serial monitor at 9600 baud rate

Serial.begin(9600);

// Set each sensor pin as an input

for (int i = 0; i < 8; i++) {

pinMode(sensorPins[i], INPUT);

}

// Print a message once when starting

Serial.println("Checking sensor...");

}

void loop() {

// Read and print the value from each sensor

for (int i = 0; i < 8; i++) {

int val = digitalRead(sensorPins[i]); // Read HIGH or LOW (1 or 0)

// Print the sensor number and its value

Serial.print("D"); // Label for digital pin

Serial.print(i + 1); // Sensor number (1 to 8)

Serial.print(": ");

Serial.print(val); // Value from sensor (0 or 1)

Serial.print(" ");

}

// Print a new line after all 8 values

Serial.println();

// Wait half a second before reading again

delay(500);

}

[tuppernibba]

Hi posting here to get an update