As additional option we tested 74ac2 and reached a very good maximum frequency of measurement, up to 60mhz without a highfrequency divider. The goal of my hard work is to people get success in a single try. This air eliminator is ideal for eliminating air from refined fuels applications where product is metered into storage from a truckmounted pump. The circuit was is the same comparitor based oscillator that is the mainstay of many if not most of the microcontroller based lc meter projects on the web. A pretty good lc meter based on the avr microcontroller cappels. Measure the supply current while gradually increasing the voltage. Having inspired from surprisingly accurate lc meter. The range of this lc meter is extremely good at measuring very low value of capacitance and inductance. A prescale chip from neccel may be added with divide by 256 counters to achieve 3. Here the hardware and the software have been accomplished for a single and vital parameter i. It has an auto ranging system, which can measure 10nh to 100mh range of inductance and 0. This auto ranging pic16f84a frequency counter counts up to 3540mhz and has two separate input bnc connectors. More details on the eeprom memory can be found in section 3.
I have found that the key to running a website is making sure the visitors you are getting are interested in your subject matter. This is one of the most accurate and simplest lc inductance capacitance meters that one can find, yet one that you can easily build yourself. May 02, 2020 as works the lc meter with pic 16f84 or 16f628. R1 p1 q1 bc179 22k 1 6 2 7 3 8 4 9 5 r2 47k osc2clkout pic 16f84 pic, 9 5 r2 47k osc2clkout pic 16f84 pic 16f84a r4 1 c1 4u7 5 12 volt dc x1, revision 2 a4 date.
About accurate lc meter this is one of the most accurate and simplest lc inductance capacitance meters that one can find, yet one that you. Pic16f84 based lc meter inductance capacitor free 30. Yet another lc meter using pic16f628a embedded lab. The precision pf capacitor is switched with help of a reed relay. Posted on 110120 110320 admin posted in capacitance, inductance, lcd displays, microchip, pic. A potential divider is arranged using a resistor and a capacitor inductor such that an input ac voltage across the divider results in an output voltage across the capacitor inductor. It uses an lm311 comparator with positive feedback to make a parallel lc oscillator with digital output. About accurate lc meter this is one of the most accurate and simplest lc inductance capacitance meters that one can find, yet one that you can easily build yourself. Very accurate lc meter based on pic16f628a circuit. Very accurate lc meter based on pic16f628a pic microcontroller.
This lc meter allows to measure incredibly small inductances starting from 10nh to nh, 1uh to uh, 1mh to 100mh and capacitance from 0. Special edition lc meter kit includes top notch high precision components that are only found in premium quality kits. The project of the oscillator came from the page of lc meter of aade it use the comparator lm311 with positive feedback. Liquid controls m and ma series truck meters provide the industrys most timeproven and respected records of superior value and performance. The pic16f627a628a648a are 18pin flash based members of the versatile pic16f627a628a648a family of lowcost, highperformance, cmos, fullystatic, 8bit microcontrollers. The single head bulk plant air eliminator with optical sensor is the latest innovation in the fourdecade long evolution of liquid controls air eliminators.
The original idea seems to have come from bill carver. Here is another piece of laboratory equipment lc meter. Pic16f84a microcontroller based lc meter posted tuesday, february 07, 2012 the project utilizes a pic16f84a microcontroller to produce one of the most accurate and simplest lc inductancecapacitance meter which allows direct measurements of small inductance starting from 10nh to nh, 1uh to uh, 1mh to 100mh, and 0. So i decided to write this article on how to build an lc meter using an atmega328p chip and arduino. This project is a simple lc meter based on pic16f682a mcu. Lc meters circuit uses an auto ranging system so that way you do not need to spend time selecting ranges manually. To lower the indicated capacitance, join the links marked 3 on the diagram below.
Another project mostly from my junkbox i just needed the 16f628 and 100mh inductor from digikey. Youritronics blog archive lc meter based on pic16f84a. Mar 11, 20 i came to your lc meter a pic 16f84a and lm311 electronic components little knowledge page and noticed you could have a lot more traffic. It includes high quality doublesided printed circuit board pcb with red solder mask and presoldered tracks for easier soldering, lcd display with yellowgreen led backlight, programmed pic16f628a microcontroller chip, high precision capacitors and inductor, 1% metal film. This lc meter was built using a microchip pic 16f628a. Another neat function is the zero out switch that will reset the initial inductance capacitance, making sure that the final readings of the lc meter are as accurate as possible. May 20, 2012 voltmeter and ammeter can be easily made using pic microcontroller having adc analog to digital converter.
Lc meter pic16f628 measurement of capacitance and inductance. Lc meter accessories include air eliminators, strainers, valves, and a choice of mechanical or electronic registers and printers for presetting, totalizing deliveries, and printing tickets. May 25, 2017 this design is a simple lc meter that accurately measures the inductance and capacitance. This design is a simple lc meter that accurately measures the inductance and capacitance. To prevent stray inductancecapacitance and to ensure making the measurement more automatic, two relays have been added. I am familiar with the earlier pic based high accuracy lc meter projects. The most powerful and scaleable electronic register ever produced. This project does not use a pic micro it needs a 74hc244 and some standard transistors. The precision pf capacitor is switched with help of a. Lc meter s circuit uses an auto ranging system so that way you. If possible, use a variable regulated supply for the first try.
Very accurate lc meter base free download as pdf file. Pic16f84a is like a small computer that can execute hex. Hi, there is lcf meter project using pic will published in epe mag. I test my diyoutrunners, if i have the same turncount inductivity on each phase. L is the shock of 82 h and c it is the capacitor of pf. My last homebrew projects were back in the days of the 555 741 and bc109 and 2n3918 so this looked great for its simpleness but its too.
Very accurate lc meter based on pic16f628a using pic. An even better lc meter based on the avr attiny861 cappels. Sep 17, 2011 this lc meter was built using a microchip pic 16f628a. I have left the pretty good lc meter page intact because it is a complete project and if one wants to build an lc meter based on the attiny23 or at90s23, this is a very good project for that. The design specifically uses the pic16f628a microcontroller of microchip, which is. The pic is being operated by a 4mhz crystal while the lc oscillator based around ic2 is the heart of the construction. Lc meter based on pic16f84a circuit wiring diagrams. The oscillation frequency is the resonant frequency of the parallel lc combination. We are honored to have spent some time on the road getting to know career fuelers, drivers, and ground support agents who have. Accurate lc meter based on pic16f628a using pic microcontroller ttpsu. Lc meter using a microchip pic 16f628a hacked gadgets.
Very accurate lc meter based on pic16f84a ic this is one of the most accurate and simplest lc inductance capacitance meters that one can find, yet one that you can easily build yourself. Very accurate lc meter based on pic16f628a circuit wiring. It uses a tank oscillator circuit combining a few external components and pics internal comparator module. We changed the design to pcb of this device too, to fit in a smaller box, and started using an smd format for most components. Here is another lc meter project which is based on pic16f628a microcontroller. Pic16f877a is enough if you do this project only for testing purposes. We will use the well known parallel resonance formula see formula 1. Lc meter based on pic16f84a this is diagram about lc meter based on pic16f84a you can learn online circuit wiring diagrams. Easy to operate, easy to see, and configurable to your industry or application. Additional information on device memory may be found in the pic midrange reference manual, ds33023. The oscillator design originally came from the aade lc meter web page. Oct 16, 2010 there are quite a few good articles on how to build lc meters using pic mcus like the ones here.
To raise the indicated capacitance, join the links marked 4 on the diagram below. About author contact us pic projects privacy policy project list project search. The pic16f627a628a648a have enhanced core features, an eightlevel deep stack, and. The circuit is built around a pic 16f84a microcontroler, or its replacement 16f628a. The weeder frequency counter pic 16f84 port by peter cousens this is a port by peter cousens to the pic 16f84 of the 50mhz frequency counter kit originally available from weeder technologies. This lc meter allows to measure incredibly small inductances starting from 10 nh to nh, 1 uh to uh, 1 mh to 100 mh and capacitance from 0. Pdf pic microcontroller offline projects list 800 projects trieu.
Apr 03, 2012 lc meter pic16f628 measurement of capacitance and inductance. Very accurate lc meter based on pic16f84a ic microcontrollers mcu. Since it uses a base pic that is easily programmable, and provides a usefull bit of bench test equipment at very low cost, it makes an ideal pic. For commercial use or manufacture please contact author.
The l and c values are computed from the resonant frequency of the lc tank circuit. Voltmeter and ammeter can be easily made using pic microcontroller having adc analog to digital converter. Very accurate lc meter based on pic16f84a ic radiolocman. Posted thursday, january 26, 2012 the project illustrates a measuring tool based on pic16f870 microcontroller that would calculate the inductance and capacitance. You gotta load the lc meter code into it before it will work. Based on the lc meter brazil version hardware and software. The lc meter circuit is based on the basic principle of measuring capacitance inductance using the relation between capacitance inductance and voltage. No self respecting electronics experimenter these days should be without an lc inductancecapacitance measuring meter. Mine are often dumped into a miscellaneous box with other various components which makes it even more difficult to identify later. It is based on an alternative project named very accurate lc meter based on pic16f84a ic. I bought the assembled version of the lc200a i know thats not exactly the same, but i think its related, and i found that it works fine. Diy lc meter projects are very popular among hobbyists and students. It seems to oscillate readily over a wide range of l and c values.
You only need to start with one precision component, either the reference capacitor or the reference inductor, and using this meter, you can select or adjust the other precision component. Liquid controls lc mseries rotary motion positive displacement pd meters for custody transfer applications requiring weights and measures approved. The main components included with the pic16f870 microcontroller are the oscillator lm311 and a standard 16 characters by 2 lines lcd display. I am using pic16f877a and the result is displayed on an lcd display. This design is little different from other designs found on the internet. Lc meter using a microchip pic 16f628a hacked gadgets diy. This type of meter, especially l meter is hard to find in cheap commercial multimeters. Calculates and displays l and c from oscillation frequency using reference components. My last homebrew projects were back in the days of the 555 741 and bc109 and 2n3918 so this looked great for its simpleness but its too inaccurate if my silver mica test was anything to go by. Oct 14, 2015 the lc meter circuit is based on the basic principle of measuring capacitance inductance using the relation between capacitance inductance and voltage. The firmware is controlled from pc and is extended with further useful functions. This is an lc meter designed by vk3bhr and presented here. The project utilizes a pic16f84a microcontroller to produce one of the most accurate and simplest lc inductancecapacitance meter which allows direct measurements of small inductance starting from 10nh to nh, 1uh to uh, 1mh to 100mh, and 0. I suppose i could have wound that myself but how to measure it without a meter.
Pic16f84a microcontroller based lc meter eeweb community. The frequency comes out at pin 7 and then enters the pic at pin 11. An lc meter project provides a capstone experience. It uses pic microcontroller 16f628a, and because i recently acquired a pic programmer, i decided to test it with. Im not au fait with pic wizardry but i couldnt resists trying this as im desperate for an accurate lc meter. Feb2004 the meter measures l 1uh 10h c 1pf 6500uf f 0. A parallel port pic programmer based on an589 with an icsp connector that you can use to program virtually any pic micro since they all use the same icsp connections. The 64 bytes of data eeprom memory have the address range 0h3fh. Double check the pic orientation, the diode and the 7805.
One according to jumper connects the calibration capacitor ccal, the frequency now will be of 394khz. The lc meter is actually an lc oscillator based around the familiar comparator circuit lm 311. No relays are used to switch between inductance and capacitance measurement modes. Hopefully, it follows the well known formula for resonant frequency. I suggest to use pic with low pin numbers and multiplexed 7 segment display if you wish to use. Iop type buffer type description osc1clkin 16 16 18 i stcmos3 oscillator crystal inputexternal clock source input. Lc meter com pic 16f84a by rbj electronics youtube. Lc meter s circuit uses an auto ranging system so that way you do not need to spend time selecting ranges manually. Pic16f84a ic this is one of the most accurate and simplest lc inductance capacitance meters that one can find, yet one that you can easily build yourself. Well this is a very accurate lc meter based on pic 16f628a. Accurate lc inductance capacitance meter circuitvalley. After building and using the pretty good lc meter for a few months, i came to understand some ways in which it could be improved.
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