Problem with color sensor not working when attached to a PIC

[gryfbell]

i have been working over my project for quite sometimes..while working on it, i've notice some discrepancies..during the individual testing of the components, the color sensor was working quite well, but when i attach it to the PIC or the microcontroller, the sensor won't work at all..i was wondering the there is a possible mismatch between the hardware and the program...i programmed the code on PIC SIMULATOR IDE..

 

[srizbf]

Re: color sensor

better post your interface diagram.

 

[pakitos]

color sensor

provide the details:
type of sensor (manufacturer)
how wr you doing the connection bw the two
are you using just turn on and read code?

 

[gryfbell]

Re: color sensor

here's the schematic diagram of the color sensor..i got it from the internet...
i use an LDR in place of the photocell..

 

[keith1200rs]

color sensor

Have you tested you PIC analog input with a simple potentiometer? I suspect your settings are not correct for the PIC ADC.

Keith.

 

[pakitos]

color sensor

What is the type of pic you are using? Does it accept analog inputs? If no than you have to use an external ADC

 

[Kurenai_ryu]

color sensor

which voltage values do you have? (from 0v to 1v or from 0 v to 5v or else???)

i think 33k is too high... maybe you need to set an amplifier or buffer to decrease the impedance... (in most pics it should be lower than 10k, for adc input... )

 

[Fragrance]

Re: color sensor

i have been working over my project for quite sometimes..while working on it, i've notice some discrepancies..during the individual testing of the components, the color sensor was working quite well, but when i attach it to the PIC or the microcontroller, the sensor won't work at all..i was wondering the there is a possible mismatch between the hardware and the program...i programmed the code on PIC SIMULATOR IDE..

simply go here you will find all stuff along with code example which can be easily transfer to pic

**broken link removed**


**broken link removed**

regards
Fragrance

 

[Fragrance]

Re: color sensor

this is simple color sensor

https://www.robotroom.com/ColorSensor.html

 

[gryfbell]

Re: color sensor

@keith:i haven't tested it yet, since when i retry the sensors, i was able to get some analog values..but i still have some problems regarding ADC..when i am going to use ADC, the sensors on PORTE and the motors connected on PORTC aren't working well..i don't know what's the possible cause..

@pakitos:i am using 40-pins PIC16f877a which has an internal ADC..

 

[keith1200rs]

color sensor

It sounds like your opto circuit isn't the problem - you need to sort out the PIC port and ADC driving first.

Keith.

 

[Fragrance]

Re: color sensor

hi friend

why not go for professional solution, further i have table for pic micro used LDR or photo cell

for data sheet go here

https://www.sparkfun.com/commerce/product_info.php?products_id=8618

for pic code and schematic go here

https://www.sparkfun.com/commerce/product_info.php?products_id=8663

regards
Fragrance