QTR-RC to detect multiple colored lines

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1

Hello,
I would like to know if it’s possible to use the QTR-RC to follow a red line and a green line on a white background.
Differentiating between red and green is hoped for but only optional. I would be happy to just be able to follow either a red or a green line regardless of which one is which?

Would the 8A be more suited to color recognition than the RC ?

Question 2 : Is it possible to establish another type of communication between the Arduino and the reflectance sensor (I²C for example) to ask for a value and to get a response from the sensor?
In other words, is it mandatory to use a digital/analog pin for each sensor or is there another way?
Thank you

2

Hi.

Your first question was already answered here; both the QTR-8A and QTR-8RC versions use the same senor, so the answer is the same.

No, these sensor arrays do not support I2C; each sensor will need its own pin.

-Derrill

3

Thank you very much !

Does the Zumo reflectance sensor support I²C ?

I hope you’ll be quicker to answer since I’m currently putting my order on hold and I don’t know which to choose between the QTR-RC and the Zumo sensor. If the Zumo does support I²C I might consider buying it instead of the QTR-RC.

Thank’s again

4

Hello.

No, it does not. You can see this clearly from the product page, which fully documents the sensor (it should be obvious from the schematic alone that there is no higher-level interface available).

- Ben

5

Hi Ben, Thank you very much for clearing that up.

I just wanted to make sure because in here :

You can see an SCL and SDA pin colored in indigo. So I thought hopefully we could use them to ask for sensor values.

Anyways thanks again !