It does not require any expensive component like a microcontroller.
The timer IC is used as an astable multivibrator to generate a clock pulse, which is fed to the clock input of the 4017. Outputs of the 4017 are connected to bases of five transistors to drive 20 LEDs of different colours, each with its own current-limiting resistor.
The 4017 advances to the next output every time it receives a clock pulse, causing the LEDs to turn on and off in sequence. The speed of the flashing can be adjusted by changing the values of the resistors and capacitors in the 555 timer circuit. The author's prototype is shown in Fig. 1.
Circuit diagram of the 5-color flasher is shown in Fig. 2. The circuit comprises a 12V battery (or 12V adaptor), timer IC 555 (IC1), decade counter IC 4017 (IC2), five BC548 transistors (T1 through T5), five sets of 5mm red, green, blue, white, and yellow LEDs each, and a few other components.
If you have built 555 timer-related projects, you would be familiar with the IC. The timer IC's pin 4 (reset) and pin 8 (Vcc) are connected to the voltage supply, which can be anywhere between 9V and 12V.
In this circuit, a 10k resistor (R1) is connected between Vcc and discharge pin 7 of IC1. A 1k resistor (R2) is connected between pin 7 and the junction of pin 2 (trigger) and pin 6 (threshold).
This story is from the April 2023 edition of Electronics For You.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the April 2023 edition of Electronics For You.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
Already a subscriber? Sign In
Smart WATER SERVING ROBOT
With the advent of artificial intelligence, robots find application in various sectors such as industry, homes, bars, restaurants, events, agriculture, and even space.
Multi-Purpose Wire-Loop SECURITY SYSTEM
This multi-purpose security system utilises wire loops to secure items. Wire loops can be employed in various ways for security applications such as luggage security, bike security, bicycle security, room security, and door security.
The Importance Of RADIATION PATTERN OF AN ANTENNA
Look beyond an antenna’s size and gain; its radiation pattern holds the key to its performance. Understanding this can unlock a whole new perspective on wireless communication
"Capitalise On 'CHINA PLUS TWO,' Where Products With Higher Value Addition BECOME THE FOCUS"
EPIC Foundation aims to transform India into an electronics hardware product nation by collaborating with governments, universities, design houses, and startups.
ADDING LOCATION TRACKING To The Wearable Interface Device
Here’s how you can add location tracking, without GPS, to the project for a smartwatch like HID with keyboard and touchpad, which was published in March issue.
"NATUREINSPIRED ADAS ALGOS Will Be MUCH BETTER Than Robotic Paradigm Algos"
Most of the ADASenabled vehicles of today function on algorithms (algos) inspired by robots used in a logistics setup. Can ADAS algos inspired by the human brain and nature be better? In a conversation with EFY's Mukul Yudhveer Singh, Gagandeep Reehal, Co-Founder, CEO & CTO, Minus Zero, illustrates this using the 'sunset mistaken for red light' example, shedding light on where India's Minus Zero is headed!
NEW EV POLICY: Will It Kill More Than Two Birds With One Stone?
With China taking the lead in electric vehicle production and sales in many global markets, can India’s new electric vehicle manufacturing policy encourage champion brands to set up shop in India? Can this policy be the turning point for India’s automobile industry’s bid to go global?
A Device That Enables SELLING UNUSED INTERNET DATA From Your Mobile Network
What if you could sell your remaining mobile data before the end of the month or even daily? Christophe Bureau, a Board Member of DotDot, in a conversation with EFY’s Mukul Yudhveer Singh, sheds light on what the Dot device offers beyond assisting users in selling their unused internet data
"EV INDUSTRY'S In The Compounding Stage Of BATTERY CELL TECHNOLOGY"
As sodium-ion battery packs gain attention in India, does this spell a bleak future for lithium-ion batteries? Furthermore, where does hydrogen stand as a fuel cell and combustion fuel? Dr Yashodhan Pramod Gokhale, CTO of Battrix, weighs in
ASSISTIVE AI: Semiconductor Design, Manufacture, And Workforce
Together, human intelligence and AI create a powerful synergy, highlighting the vital lesson for the semiconductor workforce: adapt to new technologies