M30 Capacitive Proximity Sensor

[kenshih]

i've purchased the capacitive sensor as mentioned in the title for my project, and had followed the datasheet provided, providing 12v supply to sensor after going through 2 330ohm resistor, which produce a current to the sensor of around 19mA which is within the accepted range of the sensor.
i've also use a pull-up resistor as recommended. but im still not getting anything when im waving my hand and/or objects in front. anythin im missing out here? need advise, ty in advance.

link to the sensor im mentioning, http://www.cytron.com.my/viewProduct.ph ... y%20Sensor

[hyng]

If i'm not mistaken, there are two output signal, NPN and PNP. Did you pull up at the correct output which should be NPN?

[hyng]

One more thing, there is a sensitivity adjuster which is covered. Probably you can open that cover, and try to adjust the sensitivity and see if it is detectable.

[kenshih]

for the NPN and PNP based output, i tried switching them when im testing and yet there is no changes. as for the sensitivity switch, i've not try them out, will try asap. thx for giving me advise.

[kenshih]

i've just tried tweaking the sensitivity adjuster from end to end(some clicking sound indicates the end) and there is still no response!! still need help here. is there any way to check if the sensor's working? there is two LEDs within the sensor that lights up when i turn on the power supply, which means its suppose to be working... right?

[hyng]

Do you have the schematic on your connection? It would be great if you can post it here so that we can verify the problem ..
Anyway, you can request for warranty so that we can test on the sensor for you. You just need to fill up the form at the support tab, and our technical PIC will follow up with you ASAP.

[kenshih]

this is the circuit i constructed for the capacitive sensor, took the original circuit from the B106 Rotary Encoder User's Manual and edited it according to the circuit i have.

circuit for the capacitive sensor

the coding i used to test this sensor is:

#define ss0 RC0
#define itm0 RB0

void main()
{
TRISC = 0b11111111; //defining port c for input
TRISB = 0b00000000; //defining port b for output
while(1)
{
if (ss0==0) itm0=1;
else itm0=0;
}
}

[hyng]

Please try to detach 660 ohm from your circuit, connect 12V source directly to the sensor. Hope this will help.

[robosang]

Woh.... capacitive sensor? Great, what is the application?

[ober]

Good to see you know how to modify the sample circuit from rotary encoder, at least it is useful .

The code seem to be correct. Maybe the resistor highlighted by hyng should help.