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problem with Sharp IR Sensor -GP2Y0A21YK0F

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waltr:
what voltage do you measure on the Sharp's output?
Are you sure you have the + and - input pins correct?
Is the regulator (7805) output always +5V (+-0.1V)?
Do you have caps on the regulator input and output?
Do you have another power supply to feed the regulator? A 9VDC, 300 to 600mA wall wart would do fine.
I've used these and the only issues has been the high current spikes causing other circuits to reset.


--- Quote ---Quote from: zwarte on Today at 12:33:01 PM

    Check the tutorial you should Calibrate it first.

how can i do that ?? can you give me a link for calibration tutorial  ;D
--- End quote ---

The Sharp sensor do not need calibration. What zwarte may be thinking is that you are using the ADC input of a processor which might need calibration to translate V out to distance (ie the $50 robot expansion).

Soeren:
Hi,


--- Quote from: mondo32 on November 10, 2012, 03:40:03 PM ---I used a 9 volt battery and then regulated by 7805 IC then connect +ve 5 volt to VCC wire of the sensor and the ground with GND

--- End quote ---
Are you sure you got it connected the right way around? (It may be hard to see which is pin 1).

The sensor draws pulses of more than 200mA, so if your 9V battery is an alkaline PP3/"Transistor battery", it hasn't got the stamina for the task.
You can test if that's the case by measuring the input to the regulator. If it gets under 7.5..8V, it won't quite cut it.

A capacitor right at the sensor supply terminals is needed, no matter the supply.

A cap of at least 100µF (up to say 470µF), will help if it's a fresh alkaline PP3 - if it's not fresh... Forget it). Let the cap charge to the full voltage before you connect the sensor.
Placing this cap before the regulator is best (and a smller one may do it then. This is because you have a bit more allowed voltage drop before things go wrong than on the 5V side.

To sum up: Cap of 100..470µF on the input of the regulator, ~22µF on the output of the regulator and 10..47µF right on the terminals of the sensor.

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