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ACEBOTT With STEAM Module Small Smart HC-SR04 Ultrasonic Transmitter Receiver Distance Measuring Transducer Sensor for Arduino
Product Description
Products Description
Ultrasonic sensor is a sensor used to measure distance, can be used to help the car to avoid obstacles or other related distance obstacle avoidance projects.
Working Principle
The ultrasonic transmitter emits ultrasonic waves in a certain direction, at the same time the timer starts timing, ultrasonic waves spread in the air, on the way to encounter obstacles will immediately return, ultrasonic receiver received reflected waves immediately stop timing. The propagation speed of sound wave in the air is 340m/s.
Distance Calculation: According to the time t recorded by the timer, the distance s between the launching point and the obstacle can be calculated: s = 340 * t / 2.
Application reference: obstacle avoidance car, handheld range finder, water level monitoring, ultrasonic counter, etc.
Technical Specifications
| Operating voltage | 3.3V~5V |
| Operating temperature | -40°C~+85°C |
| Range of distance measurement | 3cm~500cm |
| Detection accuracy | 0.1cm |
| Blind area of measurement | <3cm |
| Frequency of emission | 40KHz |
| Size | 4.9cm*2.2cm |
Wiring & Connection
| Ultrasonic Sensor | ESP32 |
|---|---|
| VCC | 5V |
| GND | GND |
| Echo | Pin 32 |
| Trig | Pin 16 |
Note: Expansion board is attached to esp32 controller board.
Product Gallery & Details
Frequently Asked Questions (FAQ)
Q1: What is the operating voltage range of this ultrasonic sensor?
The sensor supports an operating voltage ranging from 3.3V to 5V, making it compatible with both standard 3.3V and 5V microcontrollers.
Q2: What are the measurement distance range and blind area?
The sensor features a distance measurement range from 3cm up to 500cm, with a minimum blind area of less than 3cm.
Q3: What detection accuracy and frequency does the sensor offer?
It operates at an emission frequency of 40KHz and delivers high-precision distance measurement with an accuracy of 0.1cm.
Q4: How does the ultrasonic sensor calculate the distance to an obstacle?
The transmitter emits ultrasonic waves at 40KHz and starts an internal timer. When the reflected waves bounce back from an obstacle, the timer stops. Using the speed of sound in air (340m/s), distance is calculated via s = 340 * t / 2.
Q5: How do you connect the ultrasonic sensor to an ESP32 board?
Connect VCC to 5V, GND to GND, the Echo pin to Pin 32, and the Trig pin to Pin 16. An expansion board attached to the ESP32 controller board is recommended.
Q6: What typical projects can this ultrasonic sensor be used for?
Common applications include obstacle avoidance cars, handheld range finders, water level monitoring devices, ultrasonic counters, and various proximity detection setups.
