Let's Make Robots!

IR reflective sensors QRD1113/1114 - How high off floor

Simple Question:-

I am programming an Arduino as a line follower using  5 IR reflective sensors QRD1113/1114 made into a fixed in-line bar style rig

How far from the ground do they need to be placed for best response (ie black line on white surface) ?

(do they need high flyer 1-2cm or low rider 1mm)



Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
 Google the data sheet. What does the data sheet say?

The Fairchild datasheet gave a real strange value which gave me a head scratch.

It was only when i zoomed into the pdf that i noticed that the strange squiggly lines after the 0.05(") indicated it was measured in inches - (europeans expect mm :-)- so mystery solved.

0.05" = 1.27mm


QRD 1113 collector current =0.300ma at distance=0.05" , IF=20mA,Vce=5V 

QRD 1114 collector current =1.000ma at distance=0.05" , IF=20mA,Vce=5V 

by my experience:

5 mm max for realiable operation

10 mm  may work too, but you have very slight sensitivity

I think i will make some sort of Screwed Height adjust covering from floor to 10mm

I am using the QTR sensors from Pololu. These have the QRE1113 as sensor. Best distance from ground is about 1..3mm. I think the QRD1114 will be the same, only with different housing.


Data sheet indicates a value 1.27 which is roughly between your 1..3mm - thinking about it i will try and make it screw-adjustable.