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Three tact switches, three LEDs, three I/O lines
Francois AUGER & Philippe Fretaud has posted this Design Idea on EDN that shows how to drive three LEDs and scan three tact switches with only three I/O pins of microcontroller. They have...
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A Boy and His Atom: The World’s Smallest Stop-Motion Film
A Boy and His Atom is the world’s smallest movie made of rendered still images of the individually arranged carbon atoms on a copper surface using a scanning tunneling microscope (STM). The movie was...
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Exploring HLK-RM04 Serial-to-WiFi Module
HLK-RM04 is a low-cost UART-ETH-WIFI module developed by Shenzhen Hi-Link Electronic co., Ltd with built-in TCP / IP protocol stack. In this article, Ray shares his first experience experimenting with...
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Arduino pill reminder
This Arduino-based Pill Reminder is suitable for people who often forget to take their medicines on time. It has 14 pill compartments in total and each compartment contains pills for a day of week. An...
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Very accurate master clock synchronized to the DCF77 time signal
Brett’s new masterclock is Arduino-controlled and keeps very accurate time by periodically synchronizing with the DCF77 “Atomic” Clock in Mainflingen near Frankfurt, Germany. The DCF77 library for...
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PIC based count down timer
Here is another countdown timer based on the PIC16F886 microcontroller. The timer displays the time on four bright 7-segment LEDs, which are driven by a TLC5916 LED driver chip. The timer flashes the...
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Solar battery charge controller
This Arduino Nano controlled solar battery charger can charge a standard lead acid 12V battery and runs with 90% efficiency under 70ᵒC (158ᵒF). The circuit can take up to 24V input from the solar...
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Another IR controlled light switch
Vadim Panov’s new project is about an IR controlled light switch that operates with any RC-5 compatible TV remote. His switch is built around the ATTiny2313 MCU clocked at 8MHz. The IR receiving part...
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Real-time GPS tracking device for vehicles
Check out Cooking Hacks Arduino-based GPS tracker project for vehicles that could be extremely helpful to pinpoint the exact location of the vehicle in case it is stolen. The project uses a GPS+GPRS...
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Making a motion-controlled lamp using ultrasonic sensors
HC-SR04 is an inexpensive ultrasonic sensor module readily available in market these days and is extensively used in robotic applications for sensing and ranging the obstacles. With a proper...
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Hard disk POV clock
This Instructable describes how to build your own persistence-of-vision (POV) clock using Arduino and the motor salvaged from an old hard drive. A small cut made on the one of the disks along with an...
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Audio cassette MP3 player
This Cassette Tape MP3 player is built by embedding an inexpensive USB MP3 player inside an audio cassette. Miniature switches are implemented to use the cassette tape wheels as control switches for...
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Bluetooth controlled door lock
This Bluetooth-controlled door lock, named The Bean Lock, is built around an electronic wireless deadbolt and is controlled by the LightBlue Bean, which is an Arduino compatible microcontroller that is...
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DIY tachometer using optical sensing
This DIY tachometer uses optical sensing to compute the rotational speed of a rotating object and displays the speed on an LCD display. It is Arduino-based project and can measure RPM over 20K. Digital...
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STM32 External Interrupt
In my earlier post on STM32 GPIOs I showed how to flash a LED with variable delay times. That example was based on polling method where the code continuously monitored the logic state of a GPIO input...
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Automatic fish feeder
Never forget to feed your fish again with this DIY fish feeder, which is Arduino controlled and can be programmed to automatically feed the fish at a fixed interval of time. It uses a servo motor to...
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PIC Microcontroller based resistor decade box
The old resistor decade boxes consisted of a bunch of rotary switches which make them little bulky and expensive. Stynus has built this microcontroller-based resistor decade box that uses one rotary...
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STM32 powered miniature power supply
This compactly designed power supply uses STM32 microcontroller to compute the power supply output voltage and load current, and display these parameters on a RGB OLED display. The input to this power...
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Microchip announced a new addition to its PIC12/16LF155X 8-bit...
Microchip Technology expands low-cost 8-bit PIC® Microcontroller portfolio with new devices featuring dual ADC peripheral. Microchip Technology Inc., a leading provider of microcontroller,...
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Charming 8x8x8 RGB LED cube
Check out this another 8x8x8 RGB LED cube controlled by Arduino. The 512 RGB LEDs are driven by 25 74HC595 shift registers using multiplexing. 8x8x8 RGB LED cube For those unfamiliar with LED cubes,...
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