LDR vs Ir Phototransistor

Community General Discussions
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1

Hi  Everyone

I'm doing research for my first bot from scratch. I was hoping someone could point me to a good source of info on the advatages/disavantages of using LED & LDR vs Ir with Phototransistor for proximity sensors.

My basic goal for them is to have an edge detector in each corner and a line following array. I thought the LDRs would a simple and cheap approach but was surprised to see how cheap this Ir LED & Phototrasistor set was.

So basically effectiveness vs cost vs ease of use.
Thanks 

2

You should go with the

You should go with the LED/phototransistor pair. LDRs are slow to respond to changes in light and might hamper your line following plans.

3

I am aware that the LDR

I am aware that the LDR would be more susceptible to ambient light and need to be shrouded, I guess I’m looking more for disadvantages of the phototransistor (if any)

4

QRD1114 all the way

they are 57 cents each at arrow.com, i bought a bunch and recommend them

5

Yup

Yup, I will pick some uo to play around with. Thanks everyone!