Low price, strong performance, and fast development, the cost-effective Hezhao ESP32-C3 development board has shipped tens of thousands of units and has been called a “DIY artifact” by many engineer friends.
Today’s special share is the “Bluetooth Remote Control Car” project — created by an 11-year-old student, who is the youngest developer we’ve encountered so far@PY Learning Notes.
If you’re interested, please click on the end of the article“Read the original text” to download the latest materials.
1
Bluetooth Remote Control Car Hardware Production
The Bluetooth remote control car uses the Hezhao ESP32-C3 development board as the main control, developed with MicroPython, and controlled via a mobile app.The main hardware materials include a car chassis, L298N motor driver module, battery box, switch, etc.
– Main Material Preparation –
01. Hezhao ESP32-C3 Development Board:
Currently, Hezhao sells the ESP32-C3 development board in two versions: Classic Version and Simplified Version. Both versions can be used in this project, and it is recommended for beginners to get the classic version, as it is easier for burning and debugging.
Car chassis, battery box, switch:
The car I bought includes the main chassis, 2 DC gear motors (200 RPM at 5V), and a universal wheel, along with a 5-cell battery box and a ship-type switch. In actual development, you can replace them according to your needs.
L298N Motor Driver Module:
Special Note:
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The 5V power supply is a special port: it can be used as the logic voltage input for L298N, or as a 5V power supply port for an external microcontroller or system.
When the 12V power supply port is connected to a voltage greater than 5V, the onboard 5V jumper cap is not removed, and the 5V power supply port has voltage output; when the 12V power supply port is ≤5V, the onboard 5V jumper cap needs to be removed, as L298N requires a logic driving voltage to drive the board. At this point, the 5V power supply port becomes the input port for the logic voltage supply to L298N.
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The logic inputs IN1 and IN2 are a group corresponding to output A; the logic inputs IN3 and IN4 are a group corresponding to output B.
– Hardware Wiring Diagram –
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The positive and negative poles of the battery are connected to the 12V power supply of L298N (with a switch in between) and GND, and then connect the 5V power supply and GND to the 5V and GND of the ESP32-C3 respectively.
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Two DC gear motors are connected to output A and output B of L298N respectively.
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The logic inputs IN1, 2, 3, 4 are connected to GPIO00, 01, 18, 19 of the Hezhao ESP32-C3 development board respectively.
Car hardware assembly completed
2
Using Mobile Bluetooth App to Control the Car
Bluetooth is divided into classic Bluetooth (Classic Bluetooth) and low energy Bluetooth (BLE), with low energy Bluetooth generally being Bluetooth 4.0 and above.
The Bluetooth 5.0 equipped with the Hezhao ESP32-C3 development board belongs to BLE and is not backward compatible with classic Bluetooth. Therefore, to control the ESP32-C3 car via a mobile Bluetooth app, an app that supports BLE is required. I tested many apps before I found this usable one.
– Mobile Bluetooth App –
Download Bluefruit Connect:
https://cnas.lanzoum.com/ivoGu0pre7xc, Password: 4phz
Note: The file is for Android/HarmonyOS version, please search for the IOS version yourself.
– Bluetooth Remote Control Implementation –
To control the ESP32-C3 car through the mobile Bluetooth app, it can be divided into the following three steps:
1) Implement Bluetooth broadcasting and connection;
2) When the mobile Bluetooth app presses a button, it will send data to ESP32-C3 via Bluetooth, and you need to measure the data sent for each button;
3) The data sent via Bluetooth is stored in the BLE_MSG global variable, which determines the car’s actions (forward, backward, left, right, stop).
– Bluetooth Car Source Code –
This article demonstrates the ESP32-C3 Bluetooth car developed with MicroPython, and you can download the latest files through the Gitee repository link or the “Read the original text” at the end of the article.
Gitee Repository:
https://gitee.com/py2012/blecar
Friends who are interested, let’s unleash creativity and make more interesting applications together~
Special thanks to @PY Learning NotesLooking forward to more wonderful works
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Welcome engineer friends to provide more new product definition ideas, and work with Hezhao to create more useful and fun products — starting today, if you see interesting videos on Bilibili, you can comment on the video with@Hezhao LuatOS account, and we will randomly send private messages to distribute Hezhao Mall discount coupons, looking forward to everyone’s participation!
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