fish001

[Training Camp] Internet of Things Door Lock-894446A

Overview

Based on the Tuya IoT smart door lock, I was very excited when I first heard about the free engineering project. But I didn’t expect that the course would be followed immediately by the start of the project. This is really difficult for me, who has no experience in the project. I was totally confused. I started by learning about the power supply circuit. Then I made a board and covered it with copper to connect the power supply and the ground. Then I made the board again. It was a difficult journey, but luckily I made it.

First, I connected 12V to the motor drive and 3.3V to power the chip and module (first reduce it to 5V and then use 1117 to 3.3V)

AMS1117 internal diagram

power circuit

STM32 chip

I chose the mcu development solution, using the STM32F103C8T6 chip

Motor drive circuit

pwm output diagram

If it is detected that it is greater than CCR, it will be judged as high level, otherwise it will be judged as low level.

WBR3 module specification sheet

WBR3 is a low-power embedded Wi-Fi+BLE module developed by Tuya Smart. It consists of a highly integrated wireless radio frequency chip RTL8720CF, with built-in Wi-Fi network protocol stack and rich library functions.

product description

WBR3 includes low-power KM4 MCU, WLAN MAC, 1T1R WLAN, with a maximum frequency of 100MHz, built-in 256K SRAM, built-in 2Mbyte flash and rich peripheral resources in the chip.

WBR3 is an RTOS platform that integrates all Wi-Fi MAC and TCP/IP protocol function libraries. Users can develop embedded Wi-Fi products that meet their own needs based on these.

characteristic

Built-in low-power KM4 MCU, which can double as an application processor

Main frequency 100MHz

Working voltage: 3V-3.6V

Peripherals: 9×GPIOs, 1×UART, 1×Log_Tx

Wi-Fi/BT connectivity

802.11 B/G/N20

Channel 1-14@2.4GHz(CH1-11 for US/CA, CH1-13 for EU/CN)

Support WEP/WPA/WPA2/WPA2 PSK (AES) security mode

Support Bluetooth 4.2 Low Energy

+20dBm output power in 802.11b mode

Support SmartConfig function, including Android and iOS devices

Onboard PCB Onboard antenna

Passed CE, FCC certification

Working temperature: -20℃ to 85℃

welding gun

It was my first time to hand-solder a patch. It was quite interesting, but the chip was too small and the equipment couldn't keep up. It took me a long time to solder it.

Control APP

Use Tuya App to control the starting and closing of the motor to open and close the door

[Link to Tuya IoT development platform] https://auth.tuya.com/?from=https://www.tuya.com/cn/&_source=cbc30f99f7a6c4aebca6755c2fab437f (contains detailed development documents)

Photo of motor and board

Before you buy a motor, use a small motor to simulate it first. If you want to open and close the door, it is more reasonable to choose a 180-degree motor with high torque.

There are still a lot of bugs, and the code is not open source for the time being. It will be released after it is perfected (probably it will be released, manual dog-heading)

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-22 07:28:30

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