Wiktor Wise
Building an electric traffic light is a fun project that can be done at home or in a classroom. It is important to understand the basics of electricity before attempting to build a traffic light. The process involves assembling a traffic light circuit, which requires components such as capacitors, diodes, transistors, resistors, and LEDs. The circuit board, or PCB, holds all the components and becomes a PCBA when the circuit is complete. The traffic light circuit needs an appropriate power supply, and LED drivers provide the relevant current and voltage. The timing of the traffic signals can be adjusted to control the duration of red, green, and yellow lights. This project can be made with simple items from around the home, such as milk cartons, spray paint, and cardboard tubes, and can be a great learning activity for students to understand traffic control and energy efficiency.
| Characteristics | Values |
|---|---|
| Purpose | Science fair or class project |
| Materials | Simple items from around the home, such as milk cartons, cardboard tubes, black spray paint, glue, black construction paper, green cellophane, signal control, yoghurt containers, LED lights |
| Power supply | Power cord, battery |
| Circuit | Requires a PCB, capacitors, diodes, transistors, resistors, IC sockets, LED drivers |
| Timing | Adjustable timing of red, green and yellow lights |
| Safety | Warning against working with electricity without basic understanding or assistance from a trained electrician |
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What You'll Learn
Understand the basics of electricity
Understanding the basics of electricity is essential before attempting to build an electric traffic light. Here is a detailed overview of the key concepts:
Voltage, Current, and Resistance:
Voltage, current, and resistance are the three most basic components of electricity. Voltage is like the pressure that pushes water through a hose. It is measured in volts (V) and creates a force that makes electrons flow. Current is like the diameter of the hose; it represents the rate of electron flow and is measured in amps (A). Resistance is like sand in the hose that hinders water flow. It is measured in ohms (Ω) and indicates how well something conducts electricity. Ohm's Law defines the relationship between these three components: V = I x R, where V is voltage, I is current, and R is resistance.
Direct Current (DC) and Alternating Current (AC):
There are two types of current flow: Direct Current (DC) and Alternating Current (AC). In DC, the current flows consistently in a single direction, like water in a pipe. In AC, the current constantly alternates its direction. Most electronics internally use DC, while power lines often transmit power using AC.
Power and Energy:
Power and energy are distinct concepts. Power measures capacity and is calculated by multiplying voltage by current, resulting in watts (W). Energy, on the other hand, measures delivery and is typically measured in kilowatt-hours (kWh) for everyday usage.
Conductors and Insulators:
Conductors are materials that facilitate the flow of electricity. Most metals are good conductors, which is why they are used in electrical wiring. Insulators, such as rubber and plastic, impede electricity flow and are used for safety to protect people from electrical currents.
Circuits:
A circuit is a pathway for transmitting electric current and consists of a power source, wires, and a device that utilizes the electricity. There are two common types of circuits: series and parallel. In a series circuit, all components are connected in a continuous loop, so if one part fails, the entire circuit stops functioning. Parallel circuits have multiple pathways, allowing electricity to be distributed to different areas simultaneously.
Understanding these fundamental concepts of electricity is a crucial first step in your journey to building an electric traffic light. Remember always to prioritize safety when working with electrical components.
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Choose a power supply
When choosing a power supply for your traffic light, there are a few things to consider. Firstly, it is important to note that traffic lights require a significant amount of power to function properly. The power supply should be able to provide enough electricity to illuminate the lights and any additional features, such as sensors or timers.
There are a few options for power supplies that you can consider. One option is to use a power cord connected to a mains electricity supply. This is a simple and cost-effective method, as you can easily purchase a power cord from a home improvement store or online. When choosing a power cord, it is recommended to use at least a 14-gauge grounded cord, especially if you have a metal signal. The power cord can be connected directly to the lights' leads, which are often found on the terminal block inside the signal.
Another option for a power supply is to use a battery. This can be useful if you want your traffic light to be portable or if you do not have access to a mains electricity supply. When using a battery, you will need to connect it to a battery clipper, which will allow you to control the timing of the lights. However, keep in mind that batteries may not provide as much power as a direct electricity supply, and you may need to replace or recharge them periodically.
Additionally, consider using LED or light-emitting diode lamps, as they consume less power during operations. This will make it easier to provide backup power and ensure uninterrupted functioning. LED lamps also have higher luminous efficiency and are excellent for energy conservation. However, when using LEDs, you must consider the changes in environmental temperature, as the maximum current permitted to be supplied to the LED varies with temperature.
Finally, you can explore the use of a traffic control power supply, such as the "TC" Series Power Supplies and Racks by Jasper Electronics. These power supplies are designed specifically for traffic lights and provide a reliable and efficient output that adheres to local utility company requirements. They offer a single 24VDC, 120W output and are adaptable for various chassis configurations.
Remember to prioritize safety when working with electricity and ensure that your power supply meets the requirements of your specific traffic light setup.
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Select the right capacitors
Selecting the right capacitors is an important step in building an electric traffic light. Capacitors are everywhere, from power supplies to LED lighting, commercial electronics, and signal processing. They are one of the most basic circuit elements, with several roles, including eliminating noise issues on the circuit and acting as an energy storage device.
There are two main types of capacitors available: ceramic capacitors and electrolytic capacitors. Electrolytic capacitors are polarised, with the positive leg usually longer than the negative leg. Ceramic capacitors, on the other hand, are easier to solder and are commonly used to mitigate LED flicker. When soldering a ceramic capacitor to a PCB, leave a few millimetres between the PCB and the capacitor.
When selecting a capacitor, it is important to consider the voltage, current, and temperature stress it can withstand. Capacitors can fail due to power line stresses, and capacitor failure can lead to significant issues, including short circuits. Therefore, it is crucial to choose a capacitor with a voltage rating higher than your application's voltage level. For example, if your circuit operates at 10V, select a capacitor with a minimum voltage of 13.33V to avoid voltage stress of more than 75%.
Additionally, consider the tolerance of the capacitor. If your application is critical, opt for a small tolerance, such as 5% or 10%. Lower tolerance parts are typically more expensive, but they provide greater precision and reliability.
By carefully considering the type of capacitor, voltage rating, stress tolerance, and tolerance level, you can select the right capacitors for your electric traffic light project.
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Solder the components
To solder the components of your electric traffic light, you will need a PCB (printed circuit board) to hold all the components for the finished circuit. A PCB is a circuit board with no components soldered on. When the circuit is complete on the board, it becomes a PCBA.
First, identify the type of capacitor you are using. Two types of capacitors are available: ceramic capacitors and electrolytic capacitors. Ceramic capacitors are easier to solder. When adding this component to the PCB and the ceramic capacitor, ensure there are a few millimetres between the PCB and the capacitor.
Next, solder the positive legs of the red LEDs to the collector pin of a transistor. Then, solder the positive legs of the green LEDs to the collector pin of the second transistor. After this, solder the positive legs of the yellow LEDs to the collector pin of the third transistor.
Now, connect the emitter pins of all the transistors and the negative legs of all the LEDs (red, green, and yellow) to each other. Then, connect 1K resistors to the collector pins of all the transistors. Next, solder 100K resistors to the base pin of the green and red LED transistors. Solder a 33K resistor to the base pin of the yellow LED transistor. Finally, solder the out wires of all the resistors.
Once the circuit is completed, connect the battery to the battery clipper and observe the traffic light. You can increase or decrease the timing of the red, green, and yellow wire glowing by changing the values of the capacitors.
Please note that diodes are polarised, meaning they will not operate if inserted the wrong way. They also have a band near the negative pin (the cathode). You can identify a diode by the 'D' found on the component, although LEDs commonly have this symbol too.
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Test and troubleshoot
Once you have assembled your traffic light circuit, you will need to test and troubleshoot to ensure it works correctly. Here are the steps you should follow:
Firstly, connect your traffic light to a power supply. You can do this by attaching a power cord to the lights' leads. You can purchase a power cord or use an old extension cord, ensuring it is a 14-gauge grounded cord for any metal signal. Once connected, all the lights should illuminate when plugged in.
Next, you will need to test the LEDs. If an LED is not working, there may be a fault with the circuit or the LED itself. Check the circuit for any flaws and amend as necessary. You can also adjust the timing of the LEDs by changing the values of capacitors.
You can then add a controller board to run the lights in a sequence. Manufacturers such as Galak Electronics, Lights-to-Go, and Endman produce small controller boards that fit into a section of the signal. Connect the power cord to the board's power inputs and the lights to their respective places on the board. You can adjust the timing and flashing modes using the controller.
Finally, place the completed circuit in circuit housing to protect it and its components from external elements. The housing is usually made from plastic and will protect the circuit from heat and static electricity.
It is important to note that working with electricity can be dangerous. If you do not have a basic understanding of electricity or are uncomfortable, consult a trained electrician to set up your traffic light.
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