Traffic Signals Electronics Kit

Includes all components required to build your own Traffic Signals:

• 1 × Main PCB
• 4 × Secondary PCBs
• 4 × 5 mm green LEDs
• 4 × 5 mm yellow LEDs
• 4 × 5 mm red LEDs
• 1 × STC15W404AS MCU
• 4 × 200 Ω metal film resistors
• 1 × 10 µF electrolytic capacitors
• 1 × 104 ceramic capacitor
• 1 × Toggle switch
• 2 × CR2032 battery holder

Refer to the image gallery for photographs of each component.

This STEM electronics kit is designed to teach practical electronics skills while making learning engaging and hands-on.

Learn Practical Soldering Skills: The kit includes mostly through-hole components with one beginner-friendly surface-mount component, giving builders experience with both common soldering techniques used in modern electronics.

Understand How Electronic Circuits Work: During assembly you will learn how common electronic components such as LEDs (light-emitting diodes), resistors, capacitors and microcontrollers work together to form a complete electronic system.

Discover How Traffic Signals Are Controlled: The kit demonstrates how microcontroller circuits control timed sequences of signals. The programmed controller manages the green, yellow, and red lights to safely alternate traffic directions, similar to real intersections.

Learn About Signal Timing and Logic: The finished circuit shows how electronics control: timed sequences, signal changes, and automated systems. These are core concepts used in many real technologies including automation, robotics, and smart infrastructure.

Develop STEM and Problem-Solving Skills: Building the kit encourages patience, attention to detail, logical thinking, troubleshooting skills and confidence working with electronics.

A Fun Project With a Real Result: When finished, you’ll have a fully working miniature traffic signal system that runs an automatic sequence. It makes a great desk display or can be used with toy cars for fun demonstrations.

Q: What does this electronics kit do?
A: Once assembled and powered on, the kit simulates a real traffic light system. The LEDs cycle automatically through green, yellow, and red signals in a timed sequence, similar to the way traffic lights operate at a road intersection.

Q: Can I modify the kit to use a different power source?
A: Yes, you can use any 4.5 to 6V DC power source you have available. Simply solder the wires for the external power supply onto the power connections on the PCB instead of the CR2032 battery holders.

Q: What will I learn from building this kit?
A: This project introduces the fundamentals of electronics and circuit assembly. Builders gain hands-on experience with soldering, identifying electronic components, and understanding how circuits control timing and signals. The completed project demonstrates how a microcontroller can automate a sequence of lights.

Q: Do I need previous electronics experience?
A: Previous experience can be helpful, but it is not essential. The kit is designed as an educational project and includes clear assembly instructions. Builders who are new to electronics can use it as a practical introduction to soldering and basic circuit construction.

Q: How does the traffic light sequence work?
A: The circuit contains a microcontroller that runs a programmed sequence. The lights change in a timed pattern that mimics a real traffic intersection, allowing one direction to show green while the opposite direction shows red. The sequence then cycles through yellow and red before switching directions.

Q: What powers the circuit?
A: The kit is powered using two CR2032 coin cell batteries (not included) inserted into the battery holders on the circuit board.

Q: What can the assembled kit be used for?
A: After assembly, the device becomes a working demonstration of an electronic traffic signal system. It can be used as a display project, an educational demonstration, or a fun addition to miniature roads and toy vehicles.

Q: What size toy cars can you use with the finished kit?
A: The width of the roads (both lanes) is 5.2 cm which is wide enough for many miniature toy cars, such as Hot Wheels die-cast cars. Note that cars are not included.

Dimensions (approx., when completed):

• Height: 4.8 cm
• Base: 10 cm squared
• Weight (including batteries): 54 g

PCB Type: through-hole components and one SMD component.

Power Supply: 6V DC supplied via 2 x CR2032, batteries (not included).

Anyone can build this Traffic Signals Electronics Kit following our detailed step-by-step instruction manual which can be downloaded from the link below. The password to open the manual was sent to the same email that you placed your order from. Can't find it? Just Contact Us!

Download: Traffic Signals Electronics Kit Instruction Manual

Note: The manual requires a password. This was emailed to you after your order was processed. Didn't buy your kit from The Science Hut? You can purchase our manuals by clicking [HERE].

Skill Level: Beginner
Age Rating: 12+ (adult supervision recommended for younger builders)
Assembly Time: Typically 1-2 hours

Tools required for this kit

• Soldering iron
• Solder wire

We sell these items as a Bundle which saves 10 percent or we have an excellent Electronics Soldering Kit that includes these tools and more—an excellent beginners tool kit! Just click the links above to see these products.

Of course, you only need to buy the tools once; you'll use them again and again for your future electronics projects!

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