You Are Here: Home » AVR ATmega Projects » Metering – Instrument Projects (Page 6)

A Pretty Good Wattmeter For Bench Use using microcontroller

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 with AC line powered switching circuits and needed a way to measure the true p ...

Read more

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

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 room for a lot of instruments. I wrote some straight for ...

Read more

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

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 cable was originally part of a USB mouse. The labels were printed on a laser printe ...

Read more

A Little More Serious Frequency Meter using ATtiny2313 microcontroller

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 multi-chip version at 40 Mhz, and depending upon the actual chips you use an ...

Read more

HF/VHF/UHF TEST OSCILLATOR using microcontroller

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 with the orange index stripe is the band select knob. The two RCA connectors with red insulators are the sine ...

Read more

RF Inductance Meter using microcontroller

I needed a way to measure hand-wound RF inductors in my second lab, and since I would only be doing this occasionally, I didn't need anything fancy, and since once a friend finishes his AT90S1200-based design, I plan to make one myself, I figured I'd use this for less than a year, so I didn't want to invest a lot of time in making it . I had run across the forerunner of this circuit, one that is more sophis ...

Read more

LC Determination by Resonant Frequency Measurement using microcontroller

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 module. Recently, I have needed t ...

Read more
Scroll to top