Introduction: LED Running Lights
Good afternoon, dear viewers and readers. In today’s article, I will show you running lights based on three popular microcircuits: an operational amplifier microcircuit LM358, a timer microcircuit NE555, and decimal counter microcircuit CD4017.
Step 1: YouTube Video
Step 2: Links to Radio Components.
Archive with files of LED running lights NE555 CD4017:
Link to this video:
Project on the EasyEDA page:
Links to radio components:
Radio parts store:
Microchip LM358 SMD:
Microchip NE555 SMD:
Microchip CD4017 SMD:
Multicolor diffused LEDs 5 mm:
Power connector DC-045B-13A, 3.5 х 1.35 mm:
Power supply 12 V 1 A, 3.5-1.35 mm
Step 3: Circuit Design and PCB Layout.
The running lights schematic diagram and printed circuit board (PCB) were developed in Easy EDA online environment.
The device schematic diagram consists of four parts, such as a microphone amplifier, an impulse generator, a ten-digit counter and LED indicators.
This device works in such a way that the microphone signal, after amplification and smoothing, is converted into a voltage with level proportional to the signal amplitude. This voltage is applied to an impulse generator based on the microcircuit NE555. Then the impulse generator signal arrives to the input of the ten-digit counter CD4017.
The counter microcircuit has ten outputs, six of which are connected to LED modules of different colors. Each individual LED module consists of thirty-seven LEDs.
Based on the schematic diagram, we get a double-sided printed circuit board. SMD components will be mounted on the one side of PCB, and LEDs, trimming resistors and a microphone on the other side.
Also in the online Easy EDA environment there is a 3D model preview, which allows you to view the future PCB from different angles.
Step 4: Installation of Radio Components on the Control PCB.
Next, let’s proceed to the installation of radio components on the control circuit board.
Step 5: 3D Visualization.
To create the 3D visualization and drawings of the running lights body, there was used the KOMPAS 3D program. The device body consists of six parts in the form of hexagons. For their manufacture, there will be used 3 mm transparent organic glass.
Step 6: Installing Brass Racks on the Control PCB
Next, on the printed circuit board, we insert brass racks into the holes, with a total length of 12 mm, with an external and internal thread M3, tightening them with brass nuts 6 mm long on the other side.
Step 7: Installation of Front and Rear Panels.
On the front side of the printed circuit board, we mount three parts made of organic transparent glass, after which we fasten them with screws M3 5 mm long. We do the same actions on the back of the PCB, thereby giving the finished device overall appearance.
Step 8: Description of the Trimming Resistors and Control Buttons.
On the device front side there are two trimming resistors P1 and P2, into the cross-shaped holes of which we insert decorative plastic handle for ease of adjusting.
P1 is for adjusting the master impulse generator frequency, and P2 is for adjusting the microphone sensitivity.
There are also two bottom buttons. The left button is responsible for turning the power on and off, and the right button is responsible for changing two operation modes.
In the first mode, the running lights clocking is set by sound, and in the second mode, it is only due to the impulse generator.
Step 9: Work Result.
After the body installation, we proceed to the work demonstration.
Depending on the sound caught by the microphone, you can observe how the LED modules light up in a strict sequence from the first to the sixth, thus obtaining the running lights effect.
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