• sales

    +86-0755-88291180

Chapter 10 of KitiBot-Microbit: Ultrasonic Obstacle User Guide

Chapter 10 Ultrasonic Obstacle

In this chapter we talk about how to use ultrasonic sensor and use ultrasonic for obstacle.

Generally, our ears cannot hear sounds above 20 kHz (sound was generated by vibration, 10 kHz, which is equivalent to 20 thousand vibrations per second, which is 20,000 times). Sonic waves produced above 20 kHz are called "ultrasounds". Due to their amblyopia, bats flying at night emit such ultrasound. Bats rely mainly on ultrasound to locate any avoidable obstacle on their way. Sound waves are emitted by the bat's throat and received by their ears, according to the received sound waves. They can determine the position of the front object. Ultrasound sensor invention is based on the same method


Ultrasonic sensor is mounted on the cat face, looks like two eyes of the cat, one eye is receiver and another is sender. With this ultrasonic sensor, Robot can detect the distance of obstacle in the front.

Read value of ultrasonic sensor

: Using Ultrasonic block, we can read distance value (integer) from ultrasonic sensor.

We make a project to read ultrasonic value and display to LED matrix


Show distance value with bar graph

Light more leds if obstacle is farer, less leds if closer


Obstacle detecting

We use ultrasonic sensor to detect obstacle and make robot stop when obstacle detected.


Ultrasonic sensor keeps detecting distance of obstacles in front, if distance is farer than 15cm, robot move forward, and stop if distance detected is less than 15cm. Note that you need to set servo degree to 90 on start, make sure ultrasonic sensor faces forward.

Turning when obstacle detected

We modify the code, let robot turn right when obstacle detected.


Turning according to distance

Here we add servo control code. Robot will rotate to both side to detect distance (obstacle) and turn to the farer side when obstacle is detected in front.

https://cdn.static.spotpear.com/uploads/picture/learn/micro-bit/micro-bit-kit/chapter-10-of-kitibot-microbit/chapter-10-of-kitibot-microbit-11.gif

Variables rdis and ldis are used to save distances of right side and left side. By comparing rdis and ldis, robot can judge which side is farer. Pause are added because servo need times to rotate.

TAG: Raspberry Pi HQ Camera Official Original High Quality For M12 Lenses 12.3MP IMX477 Sensor Industrial Modbus RTU RS485 8-ch 30A High Current Relay Module (E) With Digital Input X1200 Raspberry Pi 5 UPS Board Uninterruptible Power Supply For 18650-Li-Battery (NOT includ) Raspberry Pi 5 RS232/485/422 To CAN ESP32 C6 Development Board 1.43 inch AMOLED QSPI Display 1.43inch TouchScreen Dual MIC AudioI Deepseek N16R8 Raspberry Pi 5 POE PCIe To M.2 E KEY NGFF WIFI7 WIFI6 For BE200/AX210/AX200/RTL8822CE Raspberry Pi CM5 Compute Module 5 Development Kit With CM5104032 + Official Original IO Board + Case 2.13Inch E-Paper Jetson Nano Development Kit JETSON-NANO-DEV-KIT Replace For Jetson-Nano-Developer-Kit-B01 Spotpear ESP32-S3 Development Board 4 inch LCD TouchScreen Display 480x480 RS485 /SHT20 /Relay For Arduino LVGL 86 TVbox ESP32 S3 2.1 inch Round LCD Development Board 480x480 TouchScreen Display LVGL HMI With QMI8658C 6-Axis Sensor Raspberry Pi DSI Raspberry Pi Pico 2 Plus RP2350 Board RP2350A SpotPear Desktop Ornament ESP32-P4 Module Core Board PSRAM 32MB Flash 16MB N16R32 Onboard ESP32-C6 HDMI to LVDS ESP32