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PIC Light Chaser - The circuit this month is a simple 8
light chaser built around a PIC. This will demonstrate how easy
it is to program a PIC and to utilize it in a circuit. The circuit
works as follows. When power is supplied to the circuit the PIC resets
and starts …. [Randy Linscott] |
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PIC Micro LED Projects - Here is a neat PIC project that I
created using the 16F84 chip and a neat little bi-color LED from Radio
Shack. The LED can be red or green depending on the bias of the diode.
By using two of the PORT B pins, I can control the bias of the LED. If
the LED is on PORT B, Pin 0 and Pin 1, I can set Pin 0 HIGH and Pin 1
LOW, this would make..... [Jason KE4NYV] |
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PIC Vacuum Fluorescent Display Interface - (electronic
circuit added 4/05) |
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PIC12c508 Night Light Saver - ..... |
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PIC16F84 LED Chaser - There are several projects on this
page. Please scroll down to find the LED Chaser…. [Jason from
Roanoke, Virginia] |
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PIC16F873 Light Controller - (electronic circuit added 7/03)
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PICDIM Lamp Dimmer for the PIC12C508 - Microchip Application Note
Published 12-Nov-97 (app note added 2/06) |
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Picxie 2 8x8 Animated LED Signboard - The firmware supplied in
current sourcecode archive is VERY BASIC. I do intend to draw more patterns.
However, a vast workload coupled with possible emigration has put finished
firmware on hold. Please do go ahead and build this circuit though supplied
firmware is fully functional. You can have hours of fun designing your own
patterns and effects! Uses PIC16F84. (schematic / circuit added
10/02) |
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PLL-based converter controls light source - 07/02/98 EDN-Design
Ideas.....Using the circuit in Figure 1 , you can digitally control the light
intensity of a lamp. The control loop is based on a PLL, in which the VCO
comprises a light-to-frequency converter (TSL220) coupled to a light source
that derives.....PDF has several circuits, please scroll to find this one.....
[Design Idea by MASSIMO GOTTARDI, ITC-IRST, TRENTO, ITALY] |
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Pocket LED Light - An LED pocket light operates with only one cell of
battery. (added 10/05) |
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Porch light slave switch - This circuit turns on the porch light when a
passive IR security light is activated. [Designed by Andrew R. Morris
(added 6/06)] |
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Porch Light Switch - This circuit will activate a relay when light falls
to a preset level. Light level can be adjusted with VR1 and the relay contacts may
be used to operate an external light or buzzer.…. [Andy Collison] |
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Pot Controlled Variable LED Intensity Circuit - The circuit below uses
power from four rechargeable AA NiMH cells to drive 3 white LEDs. A
potentiometer varies the duty cycle of a pulse width modulator circuit to vary the
intensity of the LEDs from 0% to 100%. The beauty of the circuit is that
when the pot is all the way toward 0%, very little power is drawn from the
battery. Likewise, when the pot slider is moved toward the 100% end, full
power is fed to the LEDs. In effect, the pot becomes the on/off switch.....
[Designed by David A. Johnson] |
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Powering Fluorescent Lamps from Low Voltage DC! - inverter circuits
(added 4/02) |
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Powers LED with Constant Current Starting at 100MV over VF - This is a
proof of concept circuit which needs improvement. The part values shown will run a
high efficiency red LED with a Vf of 1.9V from only 2 nicads, right down to 2
volts. For a white LED you will need more batteries and you must increase the 1.0K
resistor to a higher value. Current sensing at a mere.....(added 2/05) [Circuit by
Stepan Novotill] |
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Preheat Starter for Electronic Ballast - 10/04/01 EDN-Design
Ideas.....Electronic ballasts for fluorescent lamps use various techniques to turn
on the bulbs. The design usually involves a compromise between turn-on voltage and
lamp life because the two are inversely related. One way to reach a reasonable
compromise is to initially allow..... [Design Idea by Arthur E Edang, Don Bosco
Technical College, Mandaluyong City, Phillipines] |
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Programmable light relay - Schematic only, no circuit description
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Pushbutton Controlled Up/Down Ramping Light - There are times when you
want a lamp to gradually change from dark to light and from light to dark, with
each push of a pushbutton switch. The circuit below performs this control
function using a flip/flop and a classic pulse width modulation or PWM method.
The circuit uses a common flip/flop IC to control the on and off logic states. A
simple pushbutton switch toggles between the two states with each press of the
button..... [Designed by David A. Johnson] |
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Push-Pull - Crossing Light Flasher - The next circuit uses a dual timer
in a Push-Pull output arrangement. While this circuit would be sightly more
expensive to build, it would make the wiring of the actual flasher mount simpler
as only two connections would be needed.…..scroll down for this circuit..... [from
Rob Paisley's Model Train web site] |
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PWM Motor Speed Controller/DC Light Dimmer - DC Light Dimmer using a
LM324 IC…. [G. Forrest Cook] |
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PWM Motor/Light Controller - The diagrams are for 12V operation only and
there are high side (common ground) and low side (common +12V) versions. The low
side version of the circuit uses an N Channel FET, the high side version of the
circuit uses a P Channel FET. N Channel devices tend to handle more current than P
Channel devices, they are also less expensive. The high side version of the
circuit is useful when one side of the load has to be grounded..... [G. Forrest
Cook] |
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Radio Controlled 3way Light Switch - TRIAC based 3 way light switches
are very uncommon. Typical circuit representative of those used in most light
switch type digital timers. The timer module is normally a PIC or custom chip, and
it syncs to the AC line so that a trigger pulse can be supplied at the right
moment..... [Reverse engineered schematic by Stepan Novotill] |
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Ramping Lamp Driver - This circuit drives any 12v lamp, incandescent or
LED type, in a ramping fashion. Each press of the button toggles the lamp
from a fully off mode to a fully on mode. But, instead of an instantaneous
lamp intensity change, the power is slowly ramped up and down. With the
components shown, the ramping action takes two seconds to complete. By
changing the capacitor C3, you can increase or decrease the ramping time.
The circuit will also operate with supply voltages ranging from 15v to 3v. [Hobby
circuit designed by Dave Johnson] |
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Rechargeable flashlight obsoletes lantern battery - 11-Dec-03 Issue of
EDN This Design Idea describes a high-intensity, rechargeable flashlight system
that you can build from a 6V lantern-type flashlight. The rechargeable battery
comprises four 2V, 2.5-Ahr (ampere-hour] SLA (sealed lead-acid] cells, similar in
size to a standard D-sized battery. SLA cells are especially well-suited to
powering flashlights because of their low self-discharge rate..... [Design Idea by
Fran Huffart, Linear Technology, Milpitas, CA] |
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Solar LED light - I created this circuit in an attempt to make the
simplest possible solar powered project. It would make for an excellent science
fair project, and would also serve as a good introduction to solar powered
circuitry. It may also have some practical uses, such as shedding some light into
a dark part of your house. The idea is simple, the solar panel converts sunlight
into a trickle of electricity. The electricity is used to run a white LED..... [G.
Forrest Cook] |
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Rhino8 El Sequencer - (electronic circuit added 7/03) |
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Ringing Phone Light Flasher - This is very useful in a situation were
there is lots of noise and it is impossable to hear the phone, such as a workshop.
Here is such a device. The ring detect part of this circuit came from [url]http://www.hut.fi/Misc/Electronics/circuits/telephone_ringer.html[/url].
Notes: 1. You may need to use a lower voltage zener for D1 and D2. 2. You can use
a regular relay instead of a solid state relay, but the arcing accross the
contacts may destroy it pretty quickly. 3. Be very sure that you have not
accidentally connected 120V to the phone line when building and installing
this.... [Arron Cake's circuit] |
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Robot Beacon rotating light using PIC12C508 - (circuit / schematic
design added 6/06) |
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