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dude i know better site than those...use a google search....i have a new problem....i cannot get accurate value capacitors or inductors do u have any method to minimize the error....
dude i know better site than those...use a google search....i have a new problem....i cannot get accurate value capacitors or inductors do u have any method to minimize the error....
The LC meter (that uses the PIC) requires two things to be accurate.
1 a 4mhz crystal (the PIC is basically a frequency counter)
2 an accurate capacitor for calibration.
If you have access to a capacitor meter then simply hand check a few.
Some versions of the L/C meter have a frequency display to tell you the free running frequency of your tank circuit. Still you need to know at least one variable (inductor or capacitor value) to modify the software for calibration.
If you have no access to those two somewhat common parts then your L/C meter will be inaccurate and you have no way to know by how much.
I've built the LC meter project, it works very well. The tank circuit is the secret.
Here's the FAQ on it. If you KNOW the inductor value you could in theroy skip the calibrate mode by storing caibration data in EEPROM. **broken link removed**
You could not do it with a 16F84 (not enough ROM @ 1K) a 16F628A would be a better choice. They have the source for both on this site. **broken link removed**
Here's another nifty project and it claims to do caps and inductors too. **broken link removed**
blueroomelectronics guy....thank u for ur interest.....i do have a freq counter built on pic 16f72...i am using pic 16f72 for the lc meter tooo.....i am not getting the concept....i mean how the software works ....then i can write my own ....
Mr. Rice has a good explanation on how it works. Basically, a comparator is wired to be a free running oscillator (whose frequency is a function of the capacitor or inductor to be measured).
The PIC software implements a frequency counter. Mr. Rice has the source code on the website. He measures frequency by taking the input on RA4 and configures that pin to increment TIMER0 on the falling edge. He then waits a specific time and uses the change in TIMER0 to determine the frequency, converts it to a capacitor/inductor value, and displays it on the LCD. He has equations for the conversion from frequency to component value (for the oscillator used) on the website as well.
blueroomelectronics guy....thank u for ur interest.....i do have a freq counter built on pic 16f72...i am using pic 16f72 for the lc meter tooo.....i am not getting the concept....i mean how the software works ....then i can write my own ....
sorry for bothering you, but it would be a real help for me if you can share the schematic and the hex file with me...
my email is juwel_rana82@yahoo.com
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