Nickjohnson posted an update to his network analyzer we covered previously: More tweaks and improvements! I’ve moved to a dedicated LED dimming controller for the backlight instead of resistors, and made a few other layout tweaks. It’s now out for … Read more
Nickjohnson wrote previously about his Loki PSoC based development board. Now he’s experimenting with the idea of building an ESR meter: I’ve been experimenting with different measurement options using the Loki as a test platform. I’m just about ready to … Read more
Scott Harden has designed an ECG/pulse oximeter combo project using LM324 op-amps. Scott describes, “This new project is fully documented and uses extremely common and cheap parts, all of which could be purchased at RadioShack. It serves as both an … Read more
“Presented here is XR2206 function generator with multiple waveform selection and a frequency readout display. The diagram on the right shows the internal workings of the XR2206 in the form of a block diagram. Essentially the chip contains A VCO … Read more
Bartendro is a robotic cocktail dispensing machine controlled by a Raspberry Pi. Dispensing of drink components is via peristaltic pumps which dispense a known volume with every revolution of the motor to precisely meter drinks. The Party Robotics developers explain, … Read more
1Hz to 10MHz frequency meter using ATtiny2313: This AVR-based Frequency Meter is capable of measuring frequencies from 1Hz to 10MHz with 1 Hz resolution. The hardware of this project consists of seven 7-segment displays, AVR ATtiny2313 uController, and a few … Read more
Raj I recently designed this tiny breakout board for Microchip’s 24LC512 EEPROM and MCP9802 temperature sensor devices, both of which support I2C protocol. This single board can be used for both sensing the ambient temperature and storing it. You can … Read more
Ben Krasnow developed this dispensing system that can measure out a desired mass of material via a dispensing valve controlled by a Parallax Propeller. He already had an American Weigh Scales miniPro-100, and decided to hack it so that the … Read more
Here’s a video demonstrating how to keep your BBQ under control using COSM and Flyport Wi-Fi: Michael Posavec, a strong supporter of openPicus, decided to hack his Maverick wireless BBQ thermometer adding Flyport Wi-Fi to make it Internet connected.
Room thermostat with PIC16F74, DS1820, and the Siemens M55 color LCD: The heart of the unit is an 8 bit PIC16F74 microcontroller from Microchip. It’s main task is to constantly monitor the room temperature trough a 1–wire digital thermometer IC, … Read more
Kerry Wong shows how to make an adapter circuit for measuring very low voltages with a multimeter: I will show you a simple adapter circuit that can be used for precision voltage measurement down to the µV range. Using this … Read more
William Garrido writes, “I released the USB Tester OLED Backpack today and thought it would be good for you guys to post up. It is an add on for the USB Tester for measuring voltage and current. With the OLED … Read more
Measure the speed of light using the Analog Discovery. Digilent donated two Discoveries to the Open 7400 Competition this year, they were among the most popular prizes. The optical pulse response of the Discovery scope shows a reasonably clean shape … Read more
Chris from Pyroelectro has posted this tutorial detailing the use of an IR transmitter and receiver break-beam pair to measure the speed of a fan. The IR components are used in conjunction with the Arduino UNO which processes the break-beam … Read more
At the recent DEFCON 20 conference in Las Vegas, Don C. Weber presented this talk on smart meter technology and security. The presentation deals with the optical port found on smart meters, and covers attacks from quick memory acquisition techniques … Read more
RaysLogic has posted his plans for a Parallax Propeller based heart rate monitor. Dubbed the PropEKG, Ray’s design uses an AD627 instrument amplifier and TC1029 dual op amp. Data is processed by the Propeller and relayed to a Windows PC … Read more
Eric Schmiedl writes, “See the signals that make your muscles move… all it takes is an audio recorder and $10 worth of foil, coax, and duct tape. Oh, and some sugar syrup.” Eric constructed these DIY EMG sensors which he … Read more
The Hardware Hacking guys have posted this brief tutorial with tips on improving the accuracy of ADC reading with the Arduino. They endeavor to do this by measuring the internal 1.1V reference voltage (it is available for ATMega 168 and … Read more
eclectica has posted a circuit for a PICAXE-enabled raincounter. The device employs a 1mm/pulse rain gauge to measure rainfall. Pulses from the gauge’s internal reed switch are read by the PICAXE-08 MCU, which in turn stores the running count in … Read more
This webcast by Greg Borenstein presented by O’Reilly offers a solid introduction to building your own applications with the Microsoft Kinect. Beginners will find a wealth of information about the Kinect’s theory of operation and how to use the data … Read more
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