Hi,
There are so many types of IR sensor, this one link below can output 0 or 1 controlled by Arduino when there is or not a obstacle blocked the sensor, there is a potentiometer to adjust the distance of the block range, but the adjustment is too short, any solution to enlarge it?
Thanks
Adam

https://medium.com/@aquibansari12377/arduino-ir-module-tutorial-73980ef9c8

 

...is too short, any solution to enlarge it?

Apparently a common problem. You could use a more powerful excitation or more sensitivity from the receiver. The color of the object is also important to maximize distance - glossy and bright is best.

 

The IR module shown by the TS requires the IR light to be reflected off an object. You can get better range if you use transmission mode, that is, the emitter is pointing at the receiver.

TS has to state the purpose of the module and how it is to be deployed.

 

The IR module shown by the TS requires the IR light to be reflected off an object. You can get better range if you use transmission mode, that is, the emitter is pointing at the receiver.

TS has to state the purpose of the module and how it is to be deployed.

Thanks.
I am trying to use it to detect the floor changes like stair, such as the roomba return when met stair. I think it is too heavy duty for a ultrasonic sensor like HC-SR04 here?

 

hi Adam.
A forward facing swivelled jockey wheel, operating a microswitch.?
E

 

Thanks.
I am trying to use it to detect the floor changes like stair, such as the roomba return when met stair. I think it is too heavy duty for a ultrasonic sensor like HC-SR04 here?

The HC-SR04 isn't much heavier than the LED,sensor you have and the ultrasonic sensors can detect distances on a few mm resolution over a 2.5 meters range. The LED solution is on/off at a crudely determined set point with a potentiometer.

 

hi Adam.
A forward facing swivelled jockey wheel, operating a microswitch.?
E

for floor level detect.

 

hi Adam.
Yes, falling edge detection.
E

BTW: It could be a lightly sprung slider rather than a wheel.

 

@LAOADAM if you are using a retroreflective IR sensor for cliff detection you want it to have a short range. This is usually done by pointing the emitter at such an angle that the the sensor will not see a reflection if the distance to the distant surface is greater than a distance the robot can tolerate dropping.

It is a negative object sensor because the output you are interested in is when it is not triggered. The Roomba, and other robot vacuums use IR sensors. You can even buy them as replacevent parts but you would have to work out how to use them and they are pretty expensive. Making your own is more sensible.