And how NOT to blow up your Arduino.
Your oscilloscope ground clip lead can be a potential accident waiting to happen.
Why? And how do you avoid it?
The basics about measuring mains earth referenced equipment with your oscilloscope.
EEVblog #279 – How NOT To Blow Up Your Oscilloscope! - [Link]
Professor John A. Rodgers has previously taught us what the future has in store by way of flexible, stampable microelectronics that adhere to the surface of human skin. As revolutionary as those devices can be – providing critical health-related information from real-time physiological monitoring of the human body – they are limited in their ability to penetrate the depth of human tissue for an even greater understanding. A recent study by Rodgers and his team from UIUC alongside Professor Michael R. Bruchas of Washington University has found a unique solution to the tissue issue – injectable LEDs that can stimulate and monitor brain activity.
Studying the brain with micro-injectable LEDs - [Link]
At the heart of this circuit is a precision integrated temperature sensor, LM35 (IC1), which provides an accurate linear and directly proportional output in mV, from 0 to +155 degrees C. Designed to draw a minimal current of its own, the LM35 has very low self heating in still air. Here the output of the LM35 is applied to the non-inverting input of a comparator wired around a CA3130 opamp (IC2). A voltage divider network R3-P1 sets the threshold voltage, at the inverting input of the opamp. The threshold voltage determines the adjustable temperature trip level at which the circuit is activated.
When the measured temperature exceeds the user-defined level, the comparator pulls its output High to approx. 2.2 V causing transistor T1 to be forward biased instantly. T2 is also switched on, supplying the oscillator circuit around IC3 with sufficient voltage to start working. The 555 set up in astable mode directly drives active piezoelectric buzzer Bz1 to raise a loud alert. Components R7, R8 and C4 determine the on/off rhythm of the buzzer.
Overheat Detector Alarm - [Link]
What was technology like inside a 1994 Motorola MicroTAC GSM mobile phone?
EEVBlog #492 – Vintage Motorola MicroTAC Mobile Phone Teardown - [Link]
The Arduino library has always had an “analogWrite()” function, even though the ATmega doesn’t have any way to generate a varying voltage. So why the name?
Well, what most microcontrollers can do is generate a pulse-width modulated signal, also known as PWM. That’s just a fancy way of saying that the microcontroller periodically generates a pulse, of which the width can be varied under software control.
From PWM to voltage - [Link]
Florin @ youritronics.com writes:
This is a little project I made recently, I call it USB A to micro USB bridge and it does what the name says: it’s just a bridge between the USB A female connector and the female micro USB. In the middle there is a DIL pin header that allows you to connect or disconnected individually the USB signals. I needed this because recently I started working on a USB project and I wanted to have an easy way to hook up a multimeter for measuring things like voltages or current passing through.
USB A to micro USB bridge - [Link]
The Massachusetts Institute of Technology (MIT) has discovered that pure crystalline carbon–graphene–sandwiched between two ferroelectric layers results in devices with built-in memory that operate in the terahertz range, potentially opening the door to next-generation applications: [via]
Terahertz Graphene Ferroelectrics Debut at MIT – [Link]
by Publitek European Editors
This article looks at the latest touchscreen sensor technologies and the wide range of interfaces that the different technologies use. It also evaluates the different approaches for interfacing such sensors for human interfaces from three, four and five wire to USB, covering sensors and interfaces from Atmel, 3M, IR Touch Systems, and NKK Switches. Resistive 4- and 5-wire touch sensors are the most popular and most common touchscreen technologies with about 75% market share, mainly due to their low costs and simple interface electronics. The high volume of these screens requires a low-cost reliable interface, often with a low-power element. This can be provided through a range of analog features combined with low-power modes for portable, battery-powered applications.
Evaluating Different Approaches for Interfacing Touchscreens - [Link]