In today’s world, where wireless microcontrollers are ubiquitous and inexpensive, networked projects can be realized more cheaply than ever. Maker ROBO HUB demonstrates this with a very simple setup of a WLAN-controlled RC car.
The project is based on a NodeMCU ESP8266 microcontroller, coupled with an L293D motor driver to control DC motors for differential drive. Power is supplied by three 18650 lithium-ion batteries. These components are installed in a 3D-printed vehicle chassis with four wheels. The drive train is unusual – the front wheels use geared motors, while the rear wheels use simple brushless DC motors. For the steering, the motors on each side are connected together, similar to a track drive.
The ESP8266 is programmed so that it can be controlled via a smartphone app. Although the touchscreen controls are less elegant than those on standard RC cars, they are perfectly acceptable for a low-cost DIY project.
The maker ROBO HUB has published detailed instructions on Instructables. You can also find all the necessary parts and the 3D models there as a free download.
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