After building and using the pretty good lc meter for a few months, i came to. Nov 07, 2012 hi my project is inductance and capacitance meter with avr. Wide viscosity range lc meters can accurately meter products from less than 30 ssu less than 1 centipoise to 1,500,000 ssu 325,000 centipoise. Afterward by giving a 5ma or 50 ma currentpulse that holds about 1012 us, the meter measures the voltage that falls on the capacitor or on the measured resistance. 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. Heart of leds using microcontroller 422 atmel bascom avr. This article describes the design and functioning of a simple circuit using a. Schematic source code this is the project i am currently working on 20100123. Check the homepage for more information 73, fred pe0fko.
As usual he has provided full schematics and code so you can build your own. Oct 16, 2010 avr lc meter with frequency measurement october 16, 2010, 12. Oct 14, 2015 an lc meter circuit is used to measure value of a reactive element like a capacitor or an inductor. I want to make an lc meter using microcontroller all. Sep 25, 2017 the 10ohm resistance is connected and is burning. Max038 functionsweep generator with markers attiny23 at90s1200a. At89c2051 based lc meter at89c2051 based lc meter, which can measure the inductance and capacitanace. Considering the frequency band of interest, ac coupled. Before each measurement the meter tries to discharge the capacitors in the measuring circuit for a half second.
Lc meter based on the avr microcontroller hacked gadgets. On the internet i found formulas of l and c calculations with the help of building lc and rc oscillator circuits around cmos ic inverters. The microprocessor calculates the inductance based on. The device is very sensitive when i put the test leads there is 35 pf reading on display, but it is eliminated with the calibrating button. Homemade lc meter electronics forum circuits, projects. 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. I had took the analog oscillator part from a well know schematic found on the internet and adapt it for a avr. About the programmer usbasp is a usb incircuit programmer for atmel avr controllers. Volt ampere meter measures voltage of 070v or 0500v with 100mv resolution and current consumption 010a or more with 10ma resolution. The inductance vvalue in uh becomes heed of the hour. By executing powerful instructions in a single clock cycle, the atmega8 achieves throughputs approaching 1 mips per mhz, allowing the system designer to optimize power consumption versus processing speed.
Atmel bascom avr 8051 project, the circuit archive using at89s8252 microcontroller 423. Lc meter can measure inductances starting from 10nh nh, 1uh uh, 1mh 100mh and capacitances from 0. This type of meter, especially l meter is hard to find in cheap commercial multimeters. A pretty good lc meter based on the avr using attiny23. I have been thinking about building an lc meter for a while since i do not have a multimeter that is capable of measuring inductance and while the multimeters i have can measure capacitance, they are not able to give accurate readings for small capacitance in the range of. A pretty good lc meter based on an avr attiny23 at90s23. Lc meter based on the avr microcontroller circuit wiring. I have been thinking about building an lc meter for a while since i. I love hungarian rock since my school days, but i dont know a. Electronics component,avr transistortester,lcr meter,pdf and. Atmel atmega projects l35 heat time display keypad using atmega microcontroller 424. A typical lc meter is nothing but a wide range lc oscillator.
So, i just changed the original firmware a bit and added few electronic goodies to it to make it more compact. Singlephase powerenergy meter with tamper detection application note. Multitester using atmega8 and hd44780 lcd pocketmagic. And by calculating this frequency change, we can deduce the inductance or capacitance depending on the measurement. Here is another piece of laboratory equipment lc meter. Electronics component,avr transistortester,lcr meter,pdf and gerber file share. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored.
Many times we have to wind coils to suit our needs of hf tuned circuits, filters etc. This project is a simple lc meter based on pic16f682a mcu. Lc resonant frequency meter using avr microcontroller 460. The lc meter is actually an lc oscillator based around the familiar comparator circuit lm 311. An lc meter circuit is used to measure value of a reactive element like a capacitor or an inductor. The generated clock signal is measured using the timer in at89c2051.
Atmega8l 2486rsavr0707 overview the atmega8 is a lowpower cmos 8bit microcontroller based on the avr risc architecture. Mar, 20 i needed a good lc meter for my one of my next projects so i went and built the famous lc meter by phil rice. Avr terminal for serial port using tsop1738 microcontroller 425. Placing an inductor in the test socket changes the frequency of the oscillator. If possible, use a variable regulated supply for the first try.
Meters conform to nist and international weights and measures accuracy requirements. Determination by resonant frequency measurement attiny. This project gives a cheap lc meter build using at89c2051 microcontroller. This lc meter design is pretty old but since it is a perfectly good device there was no need to designbuilddebug one of my own.
An even better lc meter based on atmel avr attiny861. This project can measure capacitance and inductance using the atmega8 microcontroller and the code is written in bascom avr. If your building the same version i can upload you the code, i dont know if i have it on pc still, but ill. Easy to operate, easy to see, and configurable to your industry or application. I test my diyoutrunners, if i have the same turncount inductivity on each phase. This project is in a very early prototype stage and is at the moment only capable of measuring inductors. Interfacing with atmega microcontroller proteus simulation. How to calculate a watt in power meter system using pic microcontroller. Oct, 2014 this is a arduino microcontroller based lc meter working discription video, we can be able to measure the inductance and capacitance with this arduino based meter. After finishing my last project simple lc meter, there were some discussions in the forum i am a member of, that ability to measure electrolytic capacitors would be very useful in this type of device. Mar 21, 2015 lc meter based on the avr microcontroller calculates and displays l and c from oscillation frequency using reference components.
The most powerful and scaleable electronic register ever produced. Inductance and capacitance meter with avr electronics forums. It uses an lm311 comparator with positive feedback to make a parallel lc oscillator with digital output. 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. The lc meter is based on elmcie or elsie and other similar lc meters. The project pertains to an lc meter based on the avr microcontroller which calculates and displays l and c from oscillation frequency using reference components. The output is around 600khz without an inductor in the test socket. This lc meter allows to measure incredibly small inductances making it perfect tool for making all types of rf coils and inductors. The limitations of this project is inductance range. Heart of leds using microcontroller 422 atmel bascom avr 8051.
Jan 23, 2012 self calibrating inductance and capacitance measuring instrument lc meter, simple and accurate. Lc determination by resonant frequency measurement attiny23 at90s23. In this project we are going to make a low range ammeter using atmega8 microcontroller. The design of the circuit includes no relays, no range switching, and a minimum of controls but it requires two precision components, a precision capacitor and a precision inductor. The pcb layout and complete project details is also available here. The microprocessor calculates the inductance based on the change in frequency. Although we have few other ways to get the current parameter from a circuit, we are going to use resistive drop method, because its the easiest and simplest way to get current parameter. Capacitance and inductance meter using atmega8 read.
Atmega4888168 automotive datasheet 3 7530kavr0714 1. Its impressive to have a very accurate result with a so small circuit. The project will show you how to build inductor and capacitor meter lc meter with avr microcontroller atmega32 as main processor. In atmega8, we are going use 10bit adc analog to digital conversion feature to do this. Unlike that popular pic version, this lc meter can also measure. Hopefully, it follows the well known formula for resonant frequency. Beyond that, the manual labor seems a bit much, and the time to complete a measurement and. An improved inductance capacitance meter by phil rice vk3bhr. It simply consists of an atmega48 and atmega88 an atmega8 and a couple of. I still need to do some more precise calibration, but the meter. Projects atmega32 avr projects list 1197 projects free. At89c2051 based lc meter free microcontroller projects. Ic2 atmega816p firmware lcmeter zenit ic3 l7805cv d1 1n4148 t1 bc557 re1 jazy ckove rele dip. Measure the supply current while gradually increasing the voltage.
Digital telemetry using atmega8 microcontroller 461. Lc meter hombrew based on phil rice vk3bhr design digital lc meter is a very useful test equipment for most hamswhether they hombrew or service their equipments. A pretty good lc meter based on the avr microcontroller calculates and displays l and c from oscillation frequency using reference components. We will use the well known parallel resonance formula see formula 1. Its perfect as the meter is having 100ma resolution. Capacitance and inductance meter using atmega8 atmega32 avr. The digital component of the project features an atmel avr at90s23. Lcce meter done in jlcpcb and easyeda atmel community. The oscillator design originally came from the aade lc meter web page. Avr microcontroller based lc meter eeweb community. Filed under complex hacks, diy hacks, electronic hacks. In the first of them, there is 1nf1% capacitor and in the second 22uh10% inductor.
Atmega4888168 automotive datasheet 7 7530kavr0714 2. Set and spmen are cleared, lpm will work as described in the instruction set manual. Every electrical engineer and lab technician has been in a situation. You only need to start with one precision component, either the reference capacitor or the reference inductor, and. Dc volt meter using ads1115 impedance, ac signal filter and over voltage protection questions. The frequency of the watchdog oscillator is voltage dependent as shown in. Based on the lc meter brazil version hardware and software. This is a arduino microcontroller based lc meter working discription video, we can be able to measure the inductance and capacitance with this arduino based meter. An even better lc meter based on the avr attiny861 cappels. You gotta load the lc meter code into it before it will work. A simple esr meter with atmega8 and open source firmware a. Description after finishing my last project simple lc meter, there were some discussions in the forum i am a member of, that ability to measure electrolytic capacitors would be very useful in this type of device. An lc meter project provides a capstone experience.
Inductancecapacitance meter using microcontroller keywords. It seems to oscillate readily over a wide range of l and c values. A little more serious frequency metercounterattiny23 at90s23. Can i connect reed switch with microcontroller using 15 meter cable. The circuit includes an auto ranging as well as reset switch and produces very. Inductancecapacitance meter using microcontroller international. Since a failed aluminum electrolytic capacitor is the number one source of failures of the ubiquitous switch mode power supplies, it is handy for a hobby repairman to have an esr meter to be able to quickly incircuit check the equivalent series resistance esr of electrolytic capacitors. The meter uses pic16f876a microcontroller with 16x2 backlighted lcd. I needed a good lc meter for my one of my next projects so i went and built the famous lc meter by phil rice. I understand the basics of how the lc meter is supposed to work and all the equations, but i just need a simple tutorial using an avr chip, if not possible, then a circuitry and a code would do just fine. There are a lot of homemade lc meter plans on the web, but the best ive come across is the elsie meter kit.
Capacitance from 100pf to 1 nf on the display and when in inductance mode it displays xxx on it i made the pcbs from pdf file and didnt bothered to compile it with icc avr either. Display is from nokia 3310 phone and complete schematics, manual and source. Beyond that, the manual labor seems a bit much, and the time to complete a. Mcucr pg 667 atmega8 datasheet set interrupt sense control to indicate when interrupt triggers gicr pg 67 atmega8 datasheet set external interrupt request to enable the interrupt gifr pg 678 atmega8 datasheet the external interrupt flag is set when pin is triggered mcu jumps to interrupt vector if. Avr led rf field strength using microcontroller 459. Rf field strength meter using avr microcontroller 462. The atmelavr atmega8 is a lowpower cmos 8bit microcontroller. Lc meter, microcontroller, atmega328p, tank circuit. Wide temperature rangeproducts can be metered accurately from 40 f 40 c to 160 f 71c. If the adc is used, it should be connected to v cc through a lowpass filter. Pictured above is the first prototype lc meter, shown testing a. Atmel at89c2051 hardware keylogers circuit with using at89c2051 microcontroller 426. Homemade lc meter electronics forum circuits, projects and. The parable of his light is as if there were a niche and within it a lamp, the lamp is in.
Sylvain bissonnette said that this lc meter has few features. The original idea seems to have come from bill carver. You wont be able to do a useful simulation of it, unless you can simulate the hardware and the firmware, and the display, all at the same time. I searched the web and found a very cute project named lcm3 on this hungarian site. We are honored to have spent some time on the road getting to know career fuelers, drivers, and ground support agents who have. Both versions use the l or c to drive an oscillator. This article describes the design and functioning of a simple circuit using a 555 timer and a microcontroller.
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