Oscillator

LC Determination by Resonant Frequency Measurement using microcontroller using Atmega

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A well known L/C measurement circuit is pressed into service to make a bare bones measurement circuit. Download the AVRStudio assembly source: lgm031227I.asm Download the AVRStudio hex file: lgm031227.hex Left-to-right: The 5 volt regulator, the LM393 oscillator (a 0.047 uf capacitor is mounted on the LC circuit connector), the AT90S2313, and the serial connector to the LCD

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regulator

A Little More Serious Frequency Meter using ATtiny2313 microcontroller

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This is design for a frequency meter based on AVR microcontrollers. Maximum input frequency is specified to be 30 MHz in the multi-chip configuration, and in single-chip configuration, there are both 5 MHz and 10 Mhz versions operating with 10 and 20 MHz crystals, respectively. All versions have 9 1/2 digit resolution. I have  used

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plastic box

Preamp and 330 + MHz Prescaler for A Little More Serious Frequency Meter using microcontroller using Atmega

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A preamp that drives the CMOS counter input and a divide by 10 prescaler to extend the range of A Little More Serious Frequency Meter(elsehwhere on www.projects.cappels.org). (Above) Enclosed in a 16 cm x 16.5 cm plastic box, the preamp has a 60 cm cable to supply power and take the signal to the frequency meter/counter. The

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Generator1

RS-232 Freq. Meter/Pulse Generator Based on Atmel ATtiny2313 using microcontroller

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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

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wattmeter only

A Pretty Good Wattmeter For Bench Use using microcontroller using Atmega

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Briefly, • AC True Watts using two quadrant multiplier • Optimized for 120 VAC (can be changed) • 15 watt full scale (can be changed) • Uses DVM floating on AC Neutral as display • Requires moderately high level of analog circuit skill • Very inexpensive Find updates at:  www.projects.cappels.org Introduction I am doing some work

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Milliohmmeter

A Microcontroller Based Digital Lock-In Milliohmmeter using ATtiny2313 microcontroller

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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.

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PHduino pH Meter

PHduino pH Meter Using Arduino Using Atmega

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About This project describes an open software open hardware pH meter using an Arduino/Freeduino board. In other words, this is an electronic circuit to be connected with a glass electrode pH sensor. It was possible by the idea from my friend Mr. Denis Vidal, the space that my supervisor gave me, prof. Dr. Emanuel Carrilho, BioMicS Group, Instituto de Química de São Carlos, Universidade de

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