# What are the parts used in the pololu QTRX - RC sensors

I am making a line tracking device project, the number one important part of the device is the IR sensor itself. Now part of the project parameters is that it must be a single board and be only using smd components.

With my previous i had a really good time and success using pololu's QTR reflectance sensors and it already has a functional library that can be used in the arduino IDE (i went with SAMD21 uC). So as much as possible i would like to use this sensor and recreate it inn my board

The problem now is pololu does not say in its resource files what is the name of the sensors they using; so that i could search and buy them ( i would be needing 30 since i would be doing similar to the 31 high density ones.)

Thus the question:

Do you know what sensor is pololu using in their QTR reflectance sensors

On a related note. As a backup plan i seriously plan on considering on de-soldering those sensors off the board if i could not get them. but there is still one problem. The pololu QTR has an ic that i could not find a datasheet off This picture on the right. What is this 622k IC and what does it do so i might be able to find an alternative, i have noticed that there is 1 of this IC for every 4 sensor.

Also the QTR reflectance sensors comes in 3 versions, 2 of which are notable the QTR and the QTRX. Based on the description Both have the same type of sensors but the other one is "lensed". What do you think the purpose of each one? from reading the description alone i could only find that the current rating is the notable difference

• no, just a personal project, and a self set parameters – Jake quin Aug 4 '19 at 16:45
• i think that you may have forgotten to do basic research .... web search for Pololu QTR reflectance sensor schematic returns the schematics at the Pololu website – jsotola Aug 4 '19 at 17:19
• found a reference to Sharp GP2S60 sensor ... pololu.com/product/2456/resources – jsotola Aug 4 '19 at 17:44
• forum.pololu.com/t/qtr-8a-sensor/881 – jsotola Aug 4 '19 at 17:50
• one entry at pololu forum says that they do not reveal their sensor part number, but give this link as being similar digikey.com/products/en/sensors-transducers/… – jsotola Aug 4 '19 at 18:08