Led category

Wi-Lamp, the Open Source Wi-Fi LED lamp

LucaBellan @ open-electronics.org discuss about a multi-function LED lamp that is always connected over WiFi.

Since several years already, it is possible to find systems for home automation: irrigation, doors and windows, lighting, air conditioning and alarm systems, everything can be centralized and planned. Recently, the classical control boxes have been replaced by smart systems that are always connected to the Wi-Fi Network and that can be remotely accessed by means of mobile devices such as smartphones or tablets.

Wi-Lamp, the Open Source Wi-Fi LED lamp – [Link]

Contactless Controlled Automatic Wardrobe LED Light

Contact-less controlled automatic wardrobe light turns on the LED when you open the wardrobe door. Τhe project is based on Hall effect IC including LED driver and tiny magnet. Board doesn’t require any mechanical switch. When magnet is close to the board, LED is off, when you open the wardrobe door magnet goes far from hall IC and its turn on the LED, the IC also has special features like soft start and soft off. This board can be used in other applications like Automotive Gloves boxes and Storage, task lighting, automotive vanity mirrors. The APS13568 is the heart of the project. The IC can drive LED current up to 150mA. I have set the current 100mA approx. with help of R3. C2 is provided to set the FADE-IN/FADE-OUT time. The value of C2 can be changed as per application requirement.

Contactless Controlled Automatic Wardrobe LED Light – [Link]

COLIBRÌ: the driver for RGBW LEDs

Boris Landoni @ open-electronics.org designed COLIBRI, a board able to drive 4 color LEDs. He writes:

Recently some multicoloured power LEDs have appeared on the market and, differently from the more common RGB LEDs, they incorporate a white LED, as an addition: they are named RGBW (Red, Green, Blue, White) just because of this. They have been created because, even if in order to obtain a white light it is enough to light red, green and blue LEDs together (the brightness proportion as for red, green and blue will determine the white’s tone, that may be warm or cold), the addition of a white LED allows to obtain some much more “clean” white colours, in comparison with what could be obtained from mixing the three basic colours; it is moreover possible to use all the four LEDs together, in order to obtain a much greater luminous power.

LED Heart Keychain

@ sasakaranovic.com build a heart shaped keychain that flashes 2 LED with the touch of your finger! Source files are available on github.

This one is a very simple but cool project, something that I would recommend to anyone who is interested into DIY electronics, gadgets and learning new stuff in general. It is definitely one of those projects that don’t require too much time but you can learn a lot by making it and also earn a lot of credit by sharing it with your friends and family.

LED Heart Keychain – [Link]

72 Channels Serial To Parallel Driver Board Using 74HC595 & ULN2803

72 channels Serial (SPI) to parallel driver board has been designed for various applications. This project can be used as multi Solenoid driver, large size 7 segment display driver, bar graph driver, and LED driver. The project works with 5V logic levels. Output load supply 12V-48V DC and each output can drive 500mA load.

I have used 3 digits 2.3Inch 7 segment displays as an example, this board can handle up to 9 digits. The board can serve many applications like, Stop Watch, digital timer, counter, score board, token display and lot more.

Project built around 74HC595 and ULN2803 ICs, The 74HC595 devices contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. The storage register has parallel 3-state outputs. Separate clocks are provided for both the shift and storage register.

72 Channels Serial To Parallel Driver Board Using 74HC595 & ULN2803 – [Link]

20 Segment Jumbo Size SPI BarGraph Display

Jumbo 20 Segment SPI (Serial) bar graph driver using 74HC595 serial to parallel converter IC and BC635 display driver transistor. This project is useful for application like Amusement machines, arcade gaming, voltage display, current display, pressure sensor display, temperature sensor display , process control equipment, battery condition monitor and many more. Each segment of display consist 10 LED Bargraph display. It is easy to view from long distance, and easy to control by Micro-Controller.

20 Segment Jumbo Size SPI BarGraph Display – [Link]

Spinduino – IoT Fidget Spinner

IoT Fidget Spinner with Bluetooth Low Energy and POV LED Display by Uri Shaked.

A smart, programable Fidget Spinner with the following features:

  • JavaScript programmable
  • 10-Pixel RGB PoV display (using APA102 LEDs)
  • Spin count / speed detection using a magnetic latch
  • Using Nordic Semiconductor nRF52832 chip
  • Bluetooth Low Energy (BLE) communication with smart phone / computer for controlling the display, reading the spin count and programming
  • Over-the-air firmware upgrades
  • Fully open-source

Spinduino – IoT Fidget Spinner – [Link]

10 LED Bar-Graph Display with Op-Amp Shield for Arduino Nano

Arduino Nano Bar-Graph display with universal op-amp shield consists of 10 LEDs and single low voltage general purpose LMV321 op amp including few capacitors and resistors connected to op-amp pins. The op-amp proto area can be configured without any modifications to the board and all that is necessary is to select the correct resistors and capacitors. The other optional components can be left open or shorted depending on the configuration desired. All 10 LED comes with current limiting series resistors connected to digital pins D2 to D11 of Arduino Nano, Nano analog pin A0 used as input, the input can be used directly as voltage input to measure the voltage and display on Bar-graph.

0 To 5V Bar-graph volt meter with 0.5V step is simplest project possible with the shield, many other sensor based application possible using op-amp as signal conditioning amplifier.

Code for Simple Bar-Graph Voltmeter with 0-5V range is available here.

https://www.arduino.cc/en/Tutorial/BarGraph

10 LED Bar-Graph Display with Op-Amp Shield for Arduino Nano – [Link]

4 Digit 7 Segment Display Shield For Arduino Nano

4 Digit Multiplexed display shield for Arduino Nano with on board 2 tactile switches and LM35 temperature sensor. This shield helps you to develop many projects that require 4 digit display. For example a thermometer can be made using on board LM35 sensor.  7 Seven segment multiplexed display is a tiny board and has been designed around Common cathode 4 digit Display. Display has 12 Pins. The board is provided with current limiting resistors on all LED segments and 4 NPN Transistors to drive 4 digits. This tiny board directly seats on Arduino Nano.  Nano analog pin A0 connected to LM35 sensor, A1 and A2 connected to Switch 1 and switch 2 with pull down resistors. Digital pin D2-D8 connected to displays segment A-F, Digital pin D9 connected to DP of display, D10-D12 pins are associated to Digit 1-4 common cathode.

Features

  • Supply 5V DC
  • 4 Digit 0.3 Inch Common Cathode 7 segment display
  • On board 2 Tact switch
  • On Board Female Connector to install LM35 Temperature sensor

4 Digit 7 Segment Display Shield For Arduino Nano – [Link]

1Amp Constant Current LED Driver Shield for Arduino Nano

1A Constant current LED driver shield for Arduino Nano has been designed for verity of LED related applications. The shield provides accurate LED current sink to regulate LED current in a string of LEDs or single LED. The LED current is mirrored from the current flowing from the RSET Preset PR1. On board 1W LED is used for testing purpose. External high Wattage LED or multiple LED string can be connected by pulling two wires from the PCB and this shield fit directly on back side of Arduino Nano. Shield also has on board tactile switch connected to Digital D2 pin using pull down resistor if required for any application. On board preset helps to set the maximum constant current. PWM input pin connected to Digital pin D6 of Nano to control the LED intensity. Example code FADE-IN/FADEOUT helps to test the shield.

1Amp Constant Current LED Driver Shield for Arduino Nano – [Link]