Measure current vs voltage or voltage vs current over limited range with good accuracy This was built on a phenolic board which was mounted on a plastic box. The box serves two purposes: It holds the circuit off the workbench, and it makes a nice, stable mount for the potentiometer. Find updates at www.projects.cappels.org I realized
A SIMPLE MANUAL CURVE TRACER using microcontroller USING ATMEGA Read More »
Downloads Download the AVRStudio assembly source for the program: M8DPM091109A.asm Download the AVRStudio hex file: M8DPM091109A.hex Find updates at www.projects.cappels.org Overview – A 10 bit digital panel meter for positive voltage only. – Input resistance: about 130k – Ranges: 0 to 10.20 volts and 0 to 102.3 volts. – Over range indication. This project came from friend named
A 10 Bit LED Digital Panel Meter With Auto Ranging Based On The ATMEGA8 Read More »
Its built into a plastic project box with an aluminum cover (on the bottom). The controls are as follows: Large golden knob is coarse tuning, small black knob with a blue index stripe is fine tuning, the green LED is the power on indicator, the slide switch is the on/off switch. The small black knob
HF/VHF/UHF TEST OSCILLATOR using microcontroller USING ATMEGA Read More »
Simplicity in circuitry was the design direction. Zero mass (firmware only with no physical components) would the ultimate achievement. This instrument doesn’t have any front panel controls because the user interacts via an RS-232 terminal program at 9600 baud. I needed a frequency meter for my experiments in Nondu, Thailand, where I really don’t have
RS-232 Freq. Meter/Pulse Generator Based on Atmel ATtiny2313 using microcontroller Read More »
Download: assembler source mhm031002A.asm A milliohmmeter is just the tool for checking trace resistance on a printed circuit board, tracking down shorted traces, and measuring the contact resistance of a switch or connector. Its the kind of tool that would come in real handy occasionally, but not often enough to justify shelling out hundreds of dollars.
A Microcontroller Based Digital Lock-In Milliohmmeter using ATtiny2313 microcontroller Read More »
This is a handy companion for a digital voltmeter. Its allowed me to do a lot of things I used to use my oscilloscope for, and in addition it measures voltages to much greater precision.Using an LM324 quad op amp, this peak detector provides 2% measurement accuracy on square waves from 5 Hz to 20
Precision Audio Frequency Peak Detecting Probe using microcontroller using Atmega Read More »
Downloads Download the Download FreePC files in and the detector board layout png file in zipped forma: schottkydedtector080309 Find updates at www.projects.cappels.org Starting to do a little work at 330 MHz, I decided that my existing field strength meters were not adequate for for my needs. The 330 MHz project came to a stop, and I set
A 128 x 64 graphic LCD is in the clear plastic box at the top. It is connected to the waveform capture and control unit in the green pencil box below the display. Downloads AVR Studio 3.5 ASSEMBLY SOURCE for the waveform capture controller. AVR Studio 3.5 ASSEMBLY SOURCE for the control panel and LED Display controller.
Minimum Mass Waveform Capture and Display using AT90S2313 microcontroller using Atmega Read More »
Introduction It has been said that a man with one watch knows what time it is, but a man with two watches is never sure. The same can be said for a person who has more than one voltmeter. In my situation, I have several voltmeters in each of two different locations a third of
A Portable Precision Voltage Reference using microcontroller using Atmega Read More »
This basically the frequency meter section of the frequency meter/pulse generator based on the AT90S2313 described elsewhere on this site, combined with the 100 MHz RF interface described in the page about the RS-232 to 100 MHz RF desktop channel adapter. Built and align this is the same manner as the 100 MHz RF desktop
Frequency Meter with 100 MHz RF desktop channel using ATtiny2313 microcontroller Read More »
