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Archive for the ‘measurement’ Category

Quantifying cooling

Thursday, February 18th, 2016

Chris Palmer (a.k.a nophead) has designed and built this coolometer project to quantify the cooling effectiveness of various fan: I was wondering about how I was going to calibrate the airflow reading but then realised that the flow rate is not actually what I am interested in. It is the cooling effect...

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Posted in DIY, measurement | No Comments »

ESR measurement using multimeter and function generator

Wednesday, November 25th, 2015

Kerry Wong has written an article discussing the measurement of capacitor ESR using a multimeter and a function generator: Capacitor ESR (Equivalent Series Resistance) measurement is very useful in diagnosing issues with power supplies. In linear power supplies, a high ESR filter capacitor may cause excessive ripple current on the...

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Posted in how-to, measurement | No Comments »

DIY capacitance meter

Monday, October 26th, 2015

Electro-Labs created new open source hardware project,  a DIY capacitance meter: This is a capacitance meter which can measure capacitors rated from picofarads to millifarads. The principle of operation is simple. Just apply voltage to the capacitor and measure the elapsed time to charge it. The circuit is based on...

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Posted in DIY, measurement | 8 Comments »

Using input impedance to measure current

Wednesday, August 19th, 2015

Using input impedance to measure current, see the detailed blog post here from Sigzig: Input impedance on measurement equipment is usually kept as high as it can in an effort to prevent loading down the signals the equipment is measuring. For example most general purpose digital multimeters aim for an...

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Posted in measurement | 2 Comments »

DIY compost sensor

Friday, June 26th, 2015

Kinasmith wrote this instructable detailing how to build a compost temperature monitoring system, a web connected wireless sensor network: Why Measure the Temperature of Compost? "Composting is the biological decomposition of organic matter under aerobic conditions." Micro-organisms consume organic material and oxygen and create heat as a waste product. By measuring...

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Posted in measurement, sensors | 1 Comment »

Stand-alone inductance meter update

Friday, February 13th, 2015

An update on Lukas' stand-alone inductance meter project we covered previously: From a high-level point of view the new software is very similar to the Arduino sketch I wrote for the Inductance Meter Shield. If you look a bit closer, you’ll notice some differences for several reasons: This project uses an entirely different microcontroller:...

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Posted in measurement, PIC | 1 Comment »

DIY active differential probe characterization

Friday, January 23rd, 2015

An 1GHz active differential probe project by Daniel Kramnik: This project was an ultra high input impedance (0.5pF||30MΩ or better) high bandwidth differential oscilloscope probe designed, built, and revised over the course of two weekends for the 2014 MakeMIT hardware hackathon. It can be built for about $30 in parts, plus the...

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Posted in measurement, oscilloscope | No Comments »

Arduino-based inductance meter

Tuesday, December 16th, 2014

Lukas of Soldernerd built a DIY Arduino-based inductance meter: I’ve just finished a little Arduino project. It’s a shield for the Arduino Uno that lets you measure inductance. This is a functionality that I found missing in just about any digital multi meter. Yes, there are specialized LCR meters that let you...

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Posted in Arduino, measurement | 1 Comment »

Tektronix RSA306 IF frequency verification

Thursday, November 13th, 2014

KF5OBS writes: After posting the teardown video of the Tektronix RSA306 USB 3.0 Spectrum Analyzer on my YouTube channel, someone asked me to verify that the IF sampled by the Linear Technology 14-Bit / 125 Msps ADC is really at 140 MHz. Using the Tektronix MDO4104B-6 and a passive RF...

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Posted in measurement, testing | No Comments »

Using the cirrus logic CS5464 for AC current measurement

Friday, November 7th, 2014

Using the cirrus logic CS5464 for AC current measurement by Corgi-Tronics: Continuing the series on examining devices to measure AC current, this time we’ll try out the CS5464 from Cirrus Logic.  I initially built it up on  a breadboard, but I’ll skip writing up this test and instead build up a...

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Measure audio level using root mean square on Spark Core

Thursday, October 16th, 2014

Davide Gironi writes: A Spark.io library to retrive RMS and Spl value from an audio input. This library reads data from an ADC pin and returns the RMS value of the input simply using RMS avarage. The root mean square (abbreviated RMS or rms), also known as the quadratic mean,...

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Posted in library, measurement | No Comments »

Temperature data logger using PIC12F683 and DS1820

Monday, July 28th, 2014

Rajendra over at Electronics Lab wrote an article on his temperature logger based on a Microchip's 8-pin microcontroller, PIC12F683: A data logger is a device that records measurements over time. The measurements could be any physical variable like temperature, pressure, voltage, humidity, etc. This project describes how to build a mini...

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Posted in measurement, testing | 2 Comments »

Temperature and humidity measurement with DHT11

Monday, July 7th, 2014

  Ondrej Karas of DoItWireless writes: This article describes temperature and humidity measurement with DHT11 sensor connected to TR module. Circuit diagram is very simple. You need only power supply for sensor and one wire for data line. This line has to be “pull-uped” – sensor has open colector output.

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Posted in measurement, sensors, wireless | No Comments »

Analog AC line monitoring box

Wednesday, June 18th, 2014

Dilshan Jayakody writes: This is a quick post about our newly constructed AC line monitoring unit. This unit consists with analog AC voltmeter, frequency meter and ammeter. Both voltmeter and frequency meter are 2.5 × 2.5 inch in size and ammeter is 3.5 × 3.5 inch in size. All these panel meters are commonly...

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Posted in measurement, tools | No Comments »

Arduino GPS distance calculator

Tuesday, April 29th, 2014

GPS distance calculator created by a group of students from Indiana University, built as a final project:  As sport fans, we thought it would be really useful to create a tool that would measure distance between two points. This could be used for many different sports, but we focused on...

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Posted in Arduino, measurement | 2 Comments »

Review: building publicLab’s DIY spectroscopy kit

Tuesday, April 15th, 2014

Rohit writes, I made a Opensource Spectroscope using the publiclab's kit. I was surprised to see the kind of accuracy you can get from these easy to make Spectroscopes. I probed around a lot of light sources like LEDs, Sunlight, Tubelights and Bulbs. With LEDs I was able to estimate...

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Posted in DIY, kit biz, measurement | No Comments »

Precise analog voltage from PWM

Monday, March 17th, 2014

Destate9  writes: So I've been trying to make a constant current H-bridge circuit for a project, and I'm running into trouble with PWM. Right now, all I have connected to the Output compare pin of my PIC32MX microcontroller is a 330uF capacitor (Max ESR of 1.4 ohms according to datasheet)....

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Posted in measurement | 3 Comments »

Mini-Circuits USB power sensor review

Tuesday, March 11th, 2014

[embed]http://www.youtube.com/watch?v=_2bk_adynQI[/embed] Mini-Circuits USB power sensor review by KF5OBS Quick and brief look at the Mini-Circuits PWR-SEN-4RMS USB power sensor. It can measure the power of modulated and unmodulated signals between 50 MHz - 4000 MHz. The measurable power range is from -35 dBm to +20 dBm (100 mW).

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Posted in measurement, USB | No Comments »

Sound pressure level meter (SPL) dB audio meter using AVR ATmega

Wednesday, February 19th, 2014

Davide Gironi  has written an article detailing a simple sound pressure level meter (SPL) dB audio meter using AVR ATmega: What is proposed here is a SPL db meter using and AVR Atmega micro. A sound level meter or sound meter is an instrument which measures sound pressure level. Sound pressure...

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Posted in AVR, measurement | No Comments »

project ECHORD – Riverwatch

Wednesday, February 5th, 2014

Eduardo Pinto informs us that the Riverwatch crew has finished the first phase of their project ECHORD - Riverwatch and have posted a first version of their site. The project is developing a Marsupial Surface-Aerial Robotic Team for Riverine Environmental Monitoring. One of the main goals of our project is...

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Posted in measurement, open source, sensors | No Comments »

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