Protótipo de um sistema para sinalização de mudança de movimento em bicicletas

Abstract

In the last decade, the bicycle is gaining importance as a mean of transportation. However, there are still many accidents between cyclists and cars and one of the main causes is, according to the drivers, the lack of visibility of cyclists. Few bikes have brake light and cyclists use the hands to signal when they are going to turn in the next street. Thus, the cyclists visibility can be increased by using a light system capable of alerting drivers to bike movements, such as braking and turning. Therefore, the main goal of this project is to develop a system capable of detecting when the bycicle is braking as well as the rider’s intention of turning. In order to draw the attention of other drivers, the system will be installed in the helmet or the in the rider’s backpack. For this purpose, I used the ATMEGA168PA microcontroller, which read and process accelerometer and gyroscope data provided by the MPU6050 module to detect the rider’s movements. Seven LEDs arranged in a hexagonal format send the lighting signals of breaking and turning. The system is powered by a Li-Po battery with a capacity of 3.7 V and 240 mAh. After applying techniques to reduce energy consumption in hardware and firmware, the prototype was able to work during 18 hours. With regard to the lighting signals, the prototype presents better visibility at night, when is possible to see the brake signal at up to 40 m from the rider.