Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: ruffntuff007 on October 01, 2008, 10:37:00 AM
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hello fnds,i am buliding a line maze solver. for tat iam trying to first implement CIRCUIT OF LINE FOLLOWER. I found a sample circuit from a site which i have attached.
1. In these circuits he has used photo transistor. But in my locality i could find only THREE LEADS photo transistor where as in the circuit he has used two lead transistor. can i use the three lead phototransistor ? if yes ,how ?
2. Will the circuit work with a normal photodiode(reciever) in place of the phototransistor ?
3. can i have a better way of designing my line sensor ? it needs to be efficient with better output (3.5 v to 5v).... can anyone suggest some good techniques ?
the circuit i have attached are taken from http://www.pololu.com/catalog/product/958
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1. In these circuits he has used photo transistor. But in my locality i could find only THREE LEADS photo transistor where as in the circuit he has used two lead transistor. can i use the three lead phototransistor ? if yes ,how ?
Should be fine, even with 2 lead photo resistors, we tend to add a voltage dividing circuit to it anyway to give it three leads.
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I'd prefer the first one with the resistor...
Does your MCU has embedded ADC...
If yes, the first config is a sure shot... But see the specs of your
phototransistor to see if any changes to the value of the resistor are fit!!!
Reagards, Lefteris
GReece
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yes i am using pic 18f4550 which has inbuilt adc. but iam not able to find the photo transistor in the market. can u specify any specific part number of the phototransistor ? can i use photodiode instead of photo transistor ???
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can i use photodiode instead of photo transistor
things to look up: photoresistor, phototransistor, photodiode, CdS, photosensor, photoconductive, photocell
For all intents and purposes, they are all the same.