![]() ![]() To simplify things, I've attached the ends of jumper wires to these, allowing for easy attachment and detachment of the power supply to the breadboard power rails. I've used a battery holder that already had two wires for connections. It's important to note that since we're not utilizing a USB power supply, a 3.7v DC lithium-ion battery is required to power our project. Once you've added the micro servo to this circuit, your setup should resemble the image provided below. I've used pieces of double-sided adhesive tape to attach the Arduino Uno to the breadboard. For powering the ultrasonic sensor, the wires run behind the Arduino Uno board. Enjoy your exploration in this hands-on learning experience!Īs you can see, most of the wiring is neatly hidden from view. This approach minimizes clutter from excess wire pieces.īelow, you'll find an image showing the setup after assembling the ultrasonic sensor. Here's a pro tip: To maintain a clean and organized appearance for your circuit and project, I recommend using single strand wires instead of jumper wires. With this, we've successfully completed the circuit for our project. These letters represent the Transmitter and Receiver parts, respectively. If you look closely at the sensor, you'll see the letters 'T' and 'R' at the corners. This signal prompts the servo to lift the barrier for a specific duration (as set in the code) before returning to its default state. When the sensor detects a vehicle, it sends a signal to the micro servo. In the context of our project, vehicles are considered as obstacles. This compact module boasts a wide range of applications, and one such application is right here in our project! If any object obstructs this path, the signals bounce back and are picked up by the receiver. When powered, the transmitter emits ultrasonic signals that travel a precise distance of up to 15 centimeters. ![]() You'll notice two circular structures these are the transmitter and receiver components of the sensor. Let's take a closer look at the HC-SR04 sensor, as shown in the image below. The Trig and Echo pins, on the other hand, will be connected to the D5 and D3 pins on the Arduino Board. This sensor has four pins: VCC, Trig (Trigger), Echo, and GND.Īs is standard practice, we will connect the VCC and GND pins to the positive and negative rails of the breadboard. With the servo connections complete, let's shift our focus to the ultrasonic sensor, specifically the HC-SR04, also known as the ultrasonic distance sensor. As for the other two pins, known as GND (Ground) and VCC (Voltage), they are connected to the negative and positive pins of the breadboard power rails, respectively. The D9 pin is connected to the signal input pin of the micro servo. This means that the signals for the micro servo are transmitted in the form of pulses from the D9 pin. We are utilizing the D9 pin on the Arduino Uno board, which is a PWM (Pulse Width Modulation) pin. This servo boasts plastic gears and is fitted with a barrier holder made from a Popsicle stick attached to the servo horns. If you're new to this, let's start with a look at the plastic-geared micro servo showcased in the visual above. ![]()
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