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Wemos motor shield reprogramming
Wemos motor shield reprogramming
1. The motor shield problem
1. The motor shield problem
The Wemos motor shield consist of:
- H-bridge TB6612
- a microcontroller STM32F030 that contains a firmware.
This firmware is not properly installed on many clones. We advise you to buy directly this shield on the official Wemos shop.
Figure 1 - Motor shield
Figure 1 - Motor shield
2. The solution
2. The solution
If you have such a motor shield clone, you must reprogram it. To do this you need:
- a soldering set
- an USB-TTL module (3.3V)
- a motor reprogramming kit.
3. Connections
3. Connections
- Solde the two pads I2C and two pads RST how shown in the right side of Figure 1.
- Connect PIN RTS and 3V of the motor shield as shown in the Figure 2.
- Connect the USB-TTL module to the motor shield:
- USB-TTL RX - MOTOR SHIELD D1
- USB-TTL TX - MOTOR SHIELD D2
- USB-TTL GND - MOTOR SHIELD GND
- USB-TTL 3.3V - MOTOR SHIELD 3.3V.
- Connect USB-TTL to PC with a USB cable.
- Discover assigned port COMx (Windows OS). In the example is COM7.
Figure 2 - Connection between USB-TTL and motor shield
Figure 2 - Connection between USB-TTL and motor shield
4. Programming
4. Programming
- Download motor reprogramming kit from https://github.com/infosmick/Motor_shield_firmware and unzip in a folder in C:\
- Open the Command console and insert these commands:
C:\> cd Motor_shield_firmware-master
Directory of C:\Motor_shield_firmware-master07/10/2017 13:08 <DIR> .07/10/2017 13:08 <DIR> ..07/10/2017 12:47 3,116 motor_shield.bin07/10/2017 12:49 280 README.txt07/10/2017 12:49 13,265 stm32flash-manual.pdf07/10/2017 12:49 252,776 stm32flash.exe 4 File 269,437 byteto place yourself in the work directory;
> stm32flash.exe -k COM7
stm32flash 0.5http://stm32flash.sourceforge.net/Interface serial_w32: 57600 8E1Version : 0x31Option 1 : 0x00Option 2 : 0x00Device ID : 0x0444 (STM32F03xx4/6)- RAM : 4KiB (2048b reserved by bootloader)- Flash : 32KiB (size first sector: 4x1024)- Option RAM : 16b- System RAM : 3KiBRead-UnProtecting flashDone.to remove the protection flag;
> stm32flash.exe -f -v -w motor_shield.bin COM7
stm32flash 0.5http://stm32flash.sourceforge.net/Using Parser : Raw BINARYInterface serial_w32: 57600 8E1Version : 0x31Option 1 : 0x00Option 2 : 0x00Device ID : 0x0444 (STM32F03xx4/6)- RAM : 4KiB (2048b reserved by bootloader)- Flash : 32KiB (size first sector: 4x1024)- Option RAM : 16b- System RAM : 3KiBWrite to memoryErasing memoryWrote and verified address 0x08000c2c (100.00%) Done.to reprogram the microcontroller.
That's all!
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