Questions:
Im going to build this circuit but simulating on proteus i get "Overflow" from the lcd, no matter how i change the freq. Do you know if its a proteus problem ? I need the circuit to really work, it's for a schoool project. Thanks !+
Hello+
I have built this circuit:
http://maxhobby.altervista.org/frequenzimetro16f84/pfc50shc.gif
and when I use the hex file of this site the 16x1 display shows only 8 black squares.
But connecting a 16x2 display with the pin order like on this site makes it works perfectly.
How can I make it work with a 16x1 display and with the pin order of the picture?
I faced the problem that mentioned above that the MPLAB ICE v7.40 software showed a warning message when builded the source code.How to update the software so that i can build it?
installed Weeder frequency counter with PIC16F84a and
Fordata 16x1 LCD display unfortunatelly
dosen't work, but everything seems to be good.
The lcd shows black square on first eight character,
and nothing all.Have You any idea what is the problem
with this circuit? Best regard, please help me..
My email lu2dlt@fullzero.com.ar
goran roglic of goran replies: Hello ! I have a same problem with my PIC 16F84A, only 8 black characters. Did You solve a problem? Please if, can You help me about that? Thanks Goran+
installed Weeder frequency counter with PIC16F84a and
CRYSTALONICS CDM16116 LCD display unfortunatelly
dosen't work, but everything seems to be good.
The lcd shows black square on first eight character,
and nothing all.Have You any idea what is the problem
with this circuit? Best regard, please help me..
my email id: elektronik_ms@yahoo.com
Y.C. Tseng replies: I'd build this Frequency counter and use wct5 / wct6 code in 16F84A. The codes work very well for me. Just remind that make sure set everything off and clock in HS mode.+
+
@spam@derkjan75 at @spam@hotmail.com asks:
" Can somebody change the code for the PIC16F84A
and mail it to me? thanks" +
I installed frequency counter with PIC16F84A and a 16x1 LCD
but the LCD shows only the 8 left characters with the WCT5.asm above. ¿can anybody send me please the right code? I can give you an alternative imput circuit for this counter.
Y.C. Tseng replies: Maybe this webside you can take a look... http://www.saturn.dti.ne.jp/~khr3887/fcp.html
I would like to use this frequency counter in an ancient radio receiver so does anybody know how I can subtract a constant value? ex: it should be interesting subtract 10.7MHz or 455KHz from the red value.
I wander there is any way to establish a 4 bits paralel interface between pic and LCD. I want to put a 64 frequency devider to increase the masured frequency. I need a pine from the pic to set it high if the frequency devider is in use, and low if is not. Any idea...?
Thenks for your atention! Radu
Can anyone modify this code so it will multiply the frequency by 64? and display upto 1300 Mhz (or even 3000 Mhz) on the display.
I have found that the circuit can be easily modified to easily read these frequencys. I accept that it might not work so well at the lower end.
Its quite simply using a /64 IC. If anyone can write this code, it would be a great asset, and I will put a link to the modified circuit.
I have looked at the program, but my software simulator (labcenter Isis) cant handle all of this code (and yes, im lazy :-)
I installed this counter with wm-c1601m-1tnnc LCD.
The LCD shows some black square, and nothing all.
Have You any idea what is the problem with this circuit?
http://www.wintek.com.tw/ModuleList.asp?LcmType=&DispType=CHARACTER&ModuleNo=WM-C1601M-1TNNc
hi,
i am confused with this:
This counter use /256 prescaler, so i think it can't measure the
freq below 256 Hz, but it CAN measure the freq below 256 Hz very well, would you like to give me the answer? thank you veru much!
I installed frequency counter with PIC16F84 unfortunatelly dosen't work, but everything seems to be good. The LCD shows some black square, and nothing all.
Have You any idea what is the problem with this circuit? Best regard, Zoltán Dudás
Try http://www.weedtech.com
+ + or see
above
I'm stuck with a display that only shows the first 8 characters. It seems that anything after that needs to be addresses as if it were on line 2 of the LCD. Anyone know how to make this work short of replacing the LCD?
See the 8x2 LCD code
+
Can anyone explain what the 74hc132 does? My freq meter works if I pump an oscillator into the RTCC pin of the pic, but doesn't if I come in to the 74hc132.
@spam@je at @spam@nanosoft.hypermart.net Answers:
The 74HC132 is actually set up as a multiplexer, so it can read either new count data or the output pulses from RA2. To understand why this is done, one must remember that the prescaler of the TMR0 in the PIC is not readable. Now, being able to feed it pulsles means that you can just keep ticking it over until it gives, allowing you to get an extra 8 bits of accuracy.
Answer: From the link to the circuit, above.
As the web page says, these questions should be directed to Weeder Technologies.
Comments:
See also:
http://www.microwave.gr I constructed the counter. Only the 8 of the 16 digits light up showing black rectangles only. The counter does not do anything. What could be the fault?James Newton of James Newton's Massmind replies: Almost anything. Find a middle point in the circuit, figure out what you should be seeing at that point, and test it with a meter or 'scope. If it's good, look towards the output, if it's not, look towards the input. Keep dividing it in half till you find the first problem.+
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