HC-SR04 Based Distance Measurement with uA741 Op-Amp and Timer IC
HC-SR04 Based Distance Measurement with uA741 Op-Amp and Timer IC
1. Schematic diagram
2. Working prototype
A distance measurement system helps to anticipate the position of objects in the lane, prevents collisions and improves the safety on the road. For this purpose, distance measurement systems (DMS) including vision-based techniques, millimeter wave radars, infrared ranging, and LIDAR are used in the automotive industry. This project aims to implement a simple distance measurement system with ultrasonic sensor driven by analog electronics and eliminating any need for micro-controllers. The distance of an object from the sensor is determined by the echo signal provided by the sensor and the output is then shown using a led bar graph, indicating the distance of the object from the sensor. The project includes meticulous integration of 555 timer IC to complete generate pulses that is required to drive the HCSR04 sensor, and the output of the sensor, generated by electrical pulse, is then amplified and further characterized by three different voltage levels to estimate the distance of the object from the sensor.