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Wifi motor controller
WiFi motor controller is a highly efficient DC motor controller for creating simple remote controlled toys using a mobile device. The main purpose of the project was to build a simple WiFi controller for N/HO scale trains. However, the motor driver is not limited to trains but can also be efficiently implemented to other simple DIY toys. The project is divided into three independent and customizable parts: hardware (HW) part, software (SW) part and optional custom 3D printed train.
Key Specifications:
- Supply voltage 6-15V (polarity insensitive)
- Maximum output current 0.5A (BD622OF)/ 1A (BDF6221F)
- Access point to the device (independent to mobile device system), no external software needed to control the device
Contents
1. HW Part
Fig 1.1: The picture of the front and back of the WiFi motor control with dimensions in mm.
The hardware of the controller was created with KiCad EDA; I have been using nightly builds release 5, since it is a huge step forward with features, libraries, etc. There are some inconsistencies between the Linux and Windows version thus you might need to make some slight changes to the naming of parts (for instance in windows the library symbol for a resistor is device:R while in Linux Device:R). The hardware is based around BD622XF H-bridge driver and the most important features of HW are summarized in the block diagram. The maximal pulse voltage at the motor is equal to the input voltage reduced by the diode bridge voltage drop (~0.5V). Please consider using the power supply voltage of 12V - 15V to maximize the performance of H-bridge, since the module is very small 13.5 mm x 23.8 mm (31 mm) and the current capacity is limited.
Fig. 1.2: Block diagram of the module.
Interface pins definition and connection
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