Since the ultrasonic directivity, the energy consumption is slow, and the distance propagating in the medium is far, so ultrasonic waves are often used for distance measurements, such as rangefinders and position measuring instruments, etc., can be implemented by ultrasonic waves. Using ultrasonic testing is often relatively rapid, convenient, computational, easy to achieve real-time control, and can achieve industrial practical requirements in terms of measurement accuracy, so it has also been widely used in mobile robots.
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1, reversing radar ranging alarm (ultrasonic sensor radar ranging)
Principle: The reversing radar is composed of ultrasonic sensors, probe motherboards, LED displays, and voice systems. When the car is reversing, the reverse radar automatically starts work, the ultrasonic sensor detects the distance between the car and obstacles, and the distance is displayed on the screen, and the voice rises or makes a buzzer alarm, help the driver understand the obstacle Information, auxiliary reversing.
1. Detection distance: 0.4 ~ 2.5 meters (can be set)
2. Alarm distance: 0.4 ~ 1.5 m (can be set)
3. Working frequency: 40KHz
4. Working voltage: 12V DC
5. Consumption Current: 20mA-200mA
Scenario: https://www.cirmall.com/circuit/3438
2,51 single-chip ultrasonic range finder
Instructions for use:
1. Set the alarm distance, press the "Set" button to press the "↑" button and "→" key to modify the alarm distance, and finally press the "Confirm" button to save the set distance.
2. The set distance is saved in the EEPROM of the single-chip microcomputer, with power-down save function.
3. When the measured distance is less than the set distance, the buzzer alarms.
4. Measurement range: 2cm - 5m.
5. When the measurement range is displayed, "-.-- m" is displayed.
Scenario: https://www.cirmall.com/circuit/1095
3, microwave ranging circuit schematic + PCB source file
Based on the microwave amplification circuit, the signal is combined with the corresponding sensor, the signal is processed by the STC12C5A60S2 chip, and the LCD1602 liquid crystal screen shows the actual distance. It can measure the precise distance within 10 meters, which is more accurate than the ultrasonic ranging.
Scenario: https://www.cirmall.com/circuit/2284
4, graduation design 51 single-chip ultrasonic ranging system
This design is based on STC89C51 / 52 (universal, optional) microcontroller with AT89C51 / 52, AT89C51 / 52. Hardware composition: 51 MCU minimum system + digital tube display module + digital tube drive module + Ultrasonic racing module HC-SR04 + buzzer module + LED indicator module + button module.
1. The circuit uses the digital tube to display the distance of ultrasonic measurement, 74HC573 and triode drive digital tube, making the display brighter;
2.Hc-SR04 ultrasonic module ranging, measurement range 0.02m ~ 5.5m;
3. This design can be used as a car's reversing radar, and the alarm distance can be set;
Scenario: https://www.cirmall.com/circuit/8523
5, ranging 99 inches, MSP430 ultrasonic ranging instrument design (schematic, PCB source file, MSP430 firmware, etc.)
Rotating 99 inches, MSP430 ultrasonic ranging meter circuit features:
Ultrasonic technology
Non-contact detection and measurement
Maximum measurable distance: 99 inches
Minimum measurable distance: 6 inches
Maximum measurement error is less than 1.5 inches
The current consumption at 5V is less than 1.8mA
Simple, low cost system solution
Scenario: https://www.cirmall.com/circuit/6348
6, based on STC12 single-chip microcomputer VL53L0X laser ranging design
STC12 single-chip control VL53L0X laser ranging sensor, through serial output distance;
The VL53L0X flight time ranging sensor is a new generation of laser ranging modules, and VL53lox is a fully integrated sensor with embedded infrared, human eye safety lasers, advanced filter and ultra-high-speed photon detection arrays, and the measurement distance longer, speed and Higher accuracy.
VL53L0X sensing ability can support various functions, including various innovative user interface gestures, proximity detection, sweeping robots, service robots obstacles detection and anti-collision system, home appliance sensing, laptop users Detection or power switch monitor, and drone and Internet of Things (IoT) products, etc.
Power supply: 3-5V (internal low pressure difference regulation)
Spagnetic range: 2 meters (dark light, long distance mode)
Scenario: https://www.cirmall.com/circuit/9922
7. (Complete Curriculum Design) Ultrasonic Rotating Circuit + Source Code + Paper
Ultrasonic ranging system overview:
The requirements for this class are designed to make an ultrasonic ranging instrument, with a range of ranging from 2 meters, and the accuracy is 1 cm. This work uses the AT89S51 to do a controller, the ultrasonic reception and the transmitted frequency is 40 kHz, and the 74LS04 chip is used to constitute an ultrasonic transmission circuit, and the CX20106A chip constitutes an ultrasonic detection receiving circuit, and the digital temperature sensor DS18B20 is monitored in real time. The four-bit common male digital tube is used, and the index value is 1 cm. The entire circuit uses modular design, composed of main program, temperature compensation module, ultrasonic ranging module, display module, and the like. The signal of the probe has been analyzed by a single-chip machine to achieve ultrasonic ranging function.
Scenario: https://www.cirmall.com/circuit/2497
8, STM32 6-channel ultrasonic ranging, avoidance application - source and circuit
The project mainly uses ultrasonic waves for ranging, avoids the STM32F103, which achieves 6-channel ultrasonic ranging from the main chip and the AJ-SR04M ultrasonic ranging module, and the maximum amount of 8 meters, the final range is 20 cm, and the 1-way UART output data.
Scenario: https://www.cirmall.com/circuit/9157
9,51 single-chip machine type photoelectric rangefinder design (schematic + source code + PCB + reference document)
Wheel optical range finder design
51 single-chip microcomputer, detect the perimeter of the turntable through the photoelectric speed module, then calculate the route of the turntable, and display it on the 1602 liquid crystal!
Add a motor to drive the turntable.
Two buttons, press the first button, 1602 first line shows the current distance,
Press the second button, the second line shows the second approach,
Press the reset button, clear! ! !
Scenario Link: https://www.cirmall.com/circuit/18123
10. DIY ultrasonic ranging balance truck uses Arduino NANO Control Module (Open Source)
This scenario uses ultrasonic ranging module as a detection of a balanced state of the vehicle, eliminating the understanding and complex processing algorithm for acceleration, gyroscope sensor. The balance control of the trolley still uses popular Arduino open source hardware on the network, plus the motor drive module L298N, and the motor still uses TT motor (banana motor).
In order to reduce costs, the potentiometer adjusts the balance parameters of the set cell, and does not use the Bluetooth wireless module or wired serial port online adjustment parameters.
hardware design
The hardware design is relatively simple, with the Arduino nano as the core control module, using the HC-SR04 ultrasonic ranging module, the L298N motor drive module, and the power supply is powered by a 7.4V / 2200mAH lithium battery. The three 10K potentiometers in the figure are used in the adjustment of the KP and KD coefficient settings in the balance point setting, the PD algorithm.
Scenario: https://www.cirmall.com/circuit/1599
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Source: Circuit City
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