What does the project present?
The presented project turns on 5 LED blocks in turn. Each control block contains a maximum of 20 LEDs. The LM555 integrated circuit acts as an oscillator and the CD4017 as a decoder.
How does the project work?
It is practically a circuit "with serial input and parallel output". From the "reset" all the outputs are brought to zero (off). By applying pulses (from "oscillator") to the clock input (clock or master clock to other authors), the outputs will switch one by one (on). The 100k POT potentiometer helps to change the ignition time from one block of LEDs to another.
For proper operation, the circuit requires a 12V / 3A power supply.
List of required components
1 x Breadboard test board + connecting wires
25 x Resistant for LEDs = 150 Ohm
1 x T1, T2, T3, T4, T5 = BD651
1 x R1 = 1k
1 x R2 = 3.9k
1 x R3 = 1k
1 x R5, R6, R7, R8, R9 = 1k
1 x D1, D2, D3, D4, D5, D6, D7, D8 = 1N4001
1 x C1 = 10nF
1 x C2 = 4.7uF
1 x POT = 100k
1 x CD4017
1 x NE555
1 x Terminal contact
Distribution of LEDs for control blocks
According to the electronic scheme presented above, on each channel can be mounted in series, maximum 4 green, red or yellow LEDs. If chosen white or blue LEDs, can be mounted Maximum 3.
Download the electronic scheme in PDF format
We have attached below some application examples for this project: