Arduino RGB LED Color Wand
by T.K. Hareendran in Arduino | Tested |
Here is an artistic Arduino project for the fun-minded. The circuit is an Arduino RGB LED controller running on a sweet ‘n’ simple code,but with a little hardware surprise outside the Arduino board. You can add a bit of luxury to your aquarium or flower vase using this digital color wand! Here, D11-D10-D9 pins of Arduino is used to...
LED Constant Current
by P. Marian in Lights | Tested |
This is a very simple led constant current design using only 2 transistors, 2 resistors and an LED. This circuit allows you to use any voltage between 2V and 24V to drive almost any type of LED with power consumption up to 5W. The T2 transistor can be BC547 if you use only usual leds (the 20mA versions) but...
LED at 220V Circuit
by P. Marian in Lights |
LED has become more and more popular for use as light indicator because of its low cost and long life. Unfortunately the LED works only at low voltages and even then you need to use a resistor in series. It is not a good idea to limit the current at higher voltages using a resistor because the dissipated power...
Portable LED Lantern
by T.K. Hareendran in Lights | Tested |
This circuit is a simple emergency light with 20 “white straw hat” LEDs. One advantage of this little circuit is that we can use any ordinary 5VDC mobile phone charger ( or a 5V solar panel) to recharge the internal storage battery. Typical specification of a generic “White Straw Hat” LED (these LEDs are widely used in chinese make...
LED Solar Lantern Lights
by T.K. Hareendran in Lights | Solar | Tested |
Circuit of the LED solar lantern lights presented here is built around one 6V/1W Solar Panel (PhotoVoltaic Panel) and a 4V/800mAh Lead-Acid Battery. Here, commonly available 5mm White Straw Hat LEDs are used as the light source. how does the solar lantern circuit works DC 6V supply from the solar panel is fed to the rechargeable battery through diode...
White LED Night Light
by T.K. Hareendran in Lights | Tested |
White Light Emitting Diodes recently available can be used as a powerful alternative to incandescent lamps in lighting applications. Today’s White LEDs are less expensive, draw much less current, and project a fairly well focused beam. Described here is a simple circuit of an efficient White LED Night Light which can be directly powered from AC230V supply. First of...
555 LED Flasher
by P. Marian in 555 |
This is a small size led flasher built with the 555 timer IC that is powered from 2 x 1.5V batteries. The circuit can be used as a flashing metronome, dark room timer, memo-reminder or other similar applications. Schematics of LED Flasher with the 555 timer IC 555 datasheet how does the 555 flasher circuit works? The IC is...
Test Human Reaction Time with the 555 IC
by P. Marian in 555 | Hobby |
With this simple circuit that is built with the 555 IC you can test human reaction time. You can find out how fast do you react by trying to catch a flashing LED. How does the human reaction tester works? When S1 is ON the circuit acts as a astable multivibrator and the LED is lit for about 0.1...
LED Security Light with PIR Motion Sensor
by T.K. Hareendran in Alarms | Tested |
Here is one simple circuit of a general-purpose white LED security light with Passive Infrared (PIR) Motion sensing mechanism. At the heart of the circuit is a PIR sensor module SB0061. SB0061 is a pyroelectric sensor module which developed for human body detection. A PIR detector combined with a fresnel lens are mounted on a compact size PCB together...
Simple Arduino LED Projects
by P. Marian in Arduino |
In this article I will add some simple Arduino LED projects starting with basic ones like how to turn on an LED, blinking, and more. Every step will have the code, the schematic, photos of the project and sometimes a video tutorial. Let’s start with the simplest led project which consists in turn on an LED. You can use...