Low cost OBD2 communications on K-line
RichardvdK @ instructables.com shows us how to use OBD port of your vehicle to push data on a LCD screen. To achieve that he used a 16F886 microcontroller and some common electronics parts. This is just another OBD2 solution for monitoring the sensors in a vehicle. It supports the...
Continue ReadingControl an electrical appliance with your smartphone – WiFi
Ruben Marc Speybrouck show us how to control a device using your tablet or smartphone. To achieve that he used arduino, blynk and a wemos / ESP8266 board. In this tutorial we will be making something I call a wifi controlled ac switch. (But iy also works for DC applications that are...
Continue ReadingGraphene Patterned at Room Temp
by R. Colin Johnson @ eetimes.com LAKE WALES Fla.—Graphene is easily grown with chemical vapor deposition (CVD) on copper foil, but a simple way of etching out the necessary circuit patterns and transferring them to a non-metallic substrate has eluded engineers. Now researchers at...
Continue ReadingT-baneklokke – A Coundown clock
Joakim made a coundown clock for his wife and documented the whole process on his blog: The clock is built using an Arduino, and has a battery powered real time clock to remember the time while powered off. To make it truly stand alone I added the possibility to set the time and...
Continue ReadingDIY electronic RFID Door Lock with Battery Backup
Elmue build a RFID electronic door lock using PN532 Controller, Vehicle Battery and Teensy 3.2 board. The advantage of an electronic door lock is that the above security issues do not apply. It is much better to have a safe door lock which prevents that the thief can enter than to...
Continue ReadingReverse engineering the popular 555 timer chip (CMOS version)
Ken Shirriff reverse engineer the CMOS version of 555 timer IC and explains how it works. This article explains how the LMC555 timer chip works, from the tiny transistors and resistors on the silicon chip, to the functional units such as comparators and current mirrors that make it...
Continue Reading6 Digit Serial Display Driver with CAT4016
6 Digit serial display project has been designed around CAT4016 IC from ON semi. The CAT4016 is a 16 channel constant current driver for LED billboard and other general display applications. LED channel currents are programmed together via an external RSET resistor. Low output voltage...
Continue ReadingACS730 – Hall-effect current sensor with 1MHz bandwidth
Allegro MicroSystems has released its first ever 1MHz bandwidth Hall-effect current sensor IC, boasting a 210ns response time. The ACS730 provides an economical and precise solution for AC or DC current sensing and is aimed at industrial, commercial, and communications systems for...
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