Design and Development of a Smart Display Speedometer for Electric Bicycles Based on OLED (Organic Light Emitting Diode) Technology

Abstract

The development of electric vehicles demands an efficient and informative monitoring system, particularly for electric bicycles. This study aims to design and develop a Smart Display Speedometer system based on the ESP32 microcontroller, utilizing an OLED SSD1322 display to show real-time parameters including speed, travel distance, voltage, current, power, and battery capacity. A Hall sensor is employed to read speed and RPM, while the INA226 sensor is used to monitor electrical parameters of a 24V 20Ah battery. The travel distance data is stored in EEPROM, and the system is equipped with a reset button and a charging icon feature. System testing was conducted by comparing the output against external measuring instruments under no-load conditions. The average measurement error was 0.87% for voltage, 3.79% for current, 1.41% for RPM, and 5.11% for speed, according to the IEC 13B-23 accuracy classification. The device casing was fabricated using 3D printing with ABS+ material to enhance durability and aesthetics. The system has proven to accurately and efficiently display real-time information related to electric bicycle performance.