App note from ROHM Semiconductors when measuring thermals along exposed pads on power devices. Link here (PDF) When measuring the rear of the package with a thermocouple, to measure accurately, the thermocouple must be in close contact with the package. A thermal pad for heat dissipation is exposed on the rear side and this thermal […]
Tag Archives: measurement
DIY inline refractometer
DIY inline refractometer project from Anfractuosity: The idea of this project is to image the refractometer output, then convert the position of the blue line, to a digital reading, using image processing. The idea is to measure the brix of wort during mash and sparging, so that sparging can be stopped around 1.010 SG, to […]
Color Meter project
Isonno posted his Color Meter in the project forum: It’s a digital meter for measuring color; either the reflected color of solid object, or emitted light. It works, but the original goal was to measure/calibrate the output of RGB LEDs driven by PWM, but that didn’t work out so well. Via the forum.
USB Tester and Sick of Beige
MobileWill shows off his USB Tester in a Sick of Beige (DP5031) case : From the beginning I designed the USB Tester to use the Dangerous Prototype Sick of Beige (SOB) standard PCB sizes. 50x31mm being the smallest rectangle and most ideal for the USB Tester. One of these reasons was that in doing so it […]
Cheap frequency counter based on MSP430
SUF posted a cheap frequency counter based on MSP430 in the project log forum. Here is the properties of the project: – Cheap: The component total should be below $5 – Using TI’s MSP430 line of MCUs what I’m learning now – Able to measure till 10MHz – Using LED display – Able to calibrate – […]
Accurate milliohm measurement
Kerry writes: I have just completed a project for accurate milliohm range resistance measurements. The details are on my blog . I’d love to share this with your readers. To effectively measure small resistance values in the milliohm range, we need to accurately measure the current flowing through and at the same time accurately capture […]
Taking RFID to the limits
Chris Paget presented a talk at Defcon 18 on RFID and the security implications of long range reading of enhanced driver licenses which have embedded 900 MHz RFID tags. The video is divided into four parts totaling about 45 minutes. In addition to part 1 above, here are links to parts 2-4: Part 2 Part […]