Search found 42 matches

The formula is correct. Your capacitance reading is wrong, as I suspected
a long time ago. Their data gives the capacitance at 100RH as 193.1pF
201pF is well above this.

Thanks for your reply. I ...

cap=cap/180;
humid = -(3465.6*cap*cap*cap) + (10732*cap*cap) - (10457*cap) + 3245.9 ;

I just have realized that when i put 201pF in the equation it results in 125%.
Are you sure that the form ...

2) PCB layout/wiring can add 'stray capacitance' according to datasheet. This can be a huge problem. If PCB traces aren't perfect and clean then coated, any moisture in the air can affect the read ...

#include <18f46k22_mine.h>
#fuses HSH,NOWDT,NOPROTECT,NOBROWNOUT,NOLVP,PUT,NOCPD,NOWRT,NODEBUG,INTRC_IO,NOIESO,CCP2C1,CCP3E0,NOHFOFST,MCLR,STVREN,NOWRTB,NOEBTR,NOXINST,TIMER3C0
#device ADC=10 ...

Hello Everybody,

I am trying to measure humidity with HS1101 sensor. I am using CTMU unit on pic18f46k22. I have calibrated the constant current supply as 6.1 uA. I am getting reasonable readings ...

Too many possible parameters:

What humidity range?
What temperature range?.
What humidity range?.
What sort of environment?.
What gas?.
How 'accurate'?.
What speed?.

The DHT-22, can be qu ...

Whatever you use for detecting the temperature is OK. Personally I'd never use a resistor, simply because I'm not sure how repeatable the measurements are.
İ think it is repeatable. My results are ...

Yes. If you think about even a good ADC reference, and then the conversion

5V

NTC

Measuring point

10K

0V

While measuring resistance value there is no need for a positive refe ...

Remember though this is only a _warning_. It is saying "you might
want to re-think what you are doing", but it will still work. It means the
handling of the Timer1 interrupt will be dela ...

Hello temtronic thanks for your answer but i dont want to use another component in the project. I believe there is a way for using just NTC.

Hello,
I have a homemade incubator. I use incandescent lamps as heater. I implemented on-off control of lamps. Sometimes these lamps can be broken while incubator is working. I want to know when lamp ...

average=(sum+3)/8; //Now average the 8 value sum (4/5 //rounding).
.

Could you please explain this row in detail.I didnt get it.

Hello all,
I am having problem with interrupts disabled during call to prevent re-entrancy in Timer1 code. This is my code:

float toplam1=0;
float sicaklik = 0;

#int_timer1
void timer1_kes ...

When I read the original code, I see that ADC is sampled for 20ms. Now if the PIC is running slow, you'll get a few readings, running it at 20MHz and you'll get a LOT of readings. As pointed out, it's ...

Have to agree wholeheartedly with Jay's comment.
These are small scale CMOS chips. No 'power' elements, just very
small FET's and gates. For this type of device to 'overheat', implies it has to
hav ...