RFID Computer login
https://www.electronics-lab.com/rfid-computer-login/
Luke wanted to login on his PC without having to type in a password. He solved this by using a RC522 RFID reader and an Arduino Leonardo. There are various products on the market that would solve this problem from fingerprint readers to proximity dongles but i decided to see what i could knock up […]
ST TL072 – dual JFET opamp die-shot
https://www.electronics-lab.com/st-tl072-dual-jfet-opamp-die-shot/
A new die shoot from zeptobars.com. Die size 1547×1279 µm. ST TL072 – dual JFET opamp die-shot – [Link]
Latching power switch uses momentary-action pushbutton
https://www.electronics-lab.com/49033-2/
Anthony Smith @ edn.com published a push button latching circuit able to control a load with a single push of a button. The circuit in Figure 1 shows how you can use a simple, momentary-action, SPNO (single-pole, normally open) pushbutton switch to latch power to a load. Requiring just a handful of common, garden-variety components, […]
Single transistor provides short-circuit protection
https://www.electronics-lab.com/single-transistor-provides-short-circuit-protection/
Keith Szolusha@ edn.com writes: In certain dc/dc-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. A nonsynchronous boost converter provides a direct path from the input to the short circuit through the inductor and the catch diode. Regardless of current-limit protection in the IC, when a […]
Wireless digital scale
https://www.electronics-lab.com/wireless-digital-scale/
This is a wireless digital scale using ATTiny85 microcontroller and HM-10 Bluetooth low energy transmitter/receiver: This scale is wireless. It may be useful where you can’t operate a normal scale, due to the weather outside, or if you don’t want to scare birds or other creatures away. With this scale you can weigh them. In […]
4 Channel RC Servo Controller Board
https://www.electronics-lab.com/4-channel-rc-servo-controller-board/
This PIC microcontroller based RC driver is able to control 4 RC Servo by on board independent 4 potentiometer , 4X3PIN header for RC servo interface, screw terminal for supply input, on board power LED, optional 4X3PIN header connector for external potentiometer. Features Microcontroller based design for greater flexibility and ease of control Individual servo […]
4 Channel RC Servo Controller Board
https://www.electronics-lab.com/project/4-channel-rc-servo-controller-board/
This PIC microcontroller based RC driver is able to control 4 RC Servo by on board independent 4 potentiometer , 4X3PIN header for RC servo interface, screw terminal for supply input, on board power LED, optional 4X3PIN header connector for external potentiometer. Features Microcontroller based design for greater flexibility and ease of control Individual servo […]
ESP8266 Desktop Clock – WiFi Synchronised
https://www.electronics-lab.com/esp8266-desktop-clock-wifi-synchronised/
This project is a wifi synchronised desktop clock using 7-segment displays. The heart of the project is a ESP8266 board. The ESP8266 is a awesome chip; with integrated WiFi, 80MHz clock speed, total 160kb RAM, 512kb of flash memory, and a ton of other features, it makes a regular Arduino look like a joke. The […]
How to measure temperature very accurately with an Arduino
https://www.electronics-lab.com/measure-temperature-accurately-arduino/
This project shows how to measure temperature data from a TSYS01 Temperature Sensor board using Arduino: While studying in university we were challenged as part of a course work into designing a box with very accurate temperature control. If the project were to succeed, multiple boxes were to be built and used in a research […]
Sensing current on the high side
https://www.electronics-lab.com/home-community-blogs-benchtalk-sensing-current-high-side/
Michael Dunn@ edn.com discuss about current sense on the high side of power source. At their heart, the majority of DC current sense circuits start with a resistance in a supply line (though magnetic field sensing is a good alternative, especially in higher-current scenarios). One simply measures the voltage drop across the resistor and scales […]