This novel research is dedicated to creating an application called Lalitha that helps disabled people control an entire workstation only with their hand gestures. Lalitha has proved to be a great tool for providing brilliant user interaction and user satisfaction in terms of controlling the computer only with hand gestures. Especially, for people with disability, Lalitha would be an extremely useful tool. We incorporated Arduino, ultrasonic sensors, and software to create Lalitha. We tested our system with almost 300 people and we got positive feedback about our application Lalitha. In a word, we can claim that Lalitha is simple to set up, easy to use and its performance is brilliant. We have provided all the details of this entire application in this paper. In the rapidly evolving field of human-computer interaction (HCI), Many different industries, from gaming and augmented reality to medicine and accessibility, might benefit from this interface, This research proposes using Arduino and infrared sensors to create a system that can be controlled by hand gestures, Here We use ultrasonic sensors to detect the hand gesture and measure the distance of the palm. Ultrasonic sensors work through the time-of-flight principle (ToF), Arduino is an open-source platform that provides an accessible and versatile way to create interactive electronic projects It serves as the brain of the project. Hand gesture control provides novel approaches that increase efficiency and security in several sectors. In our project, we combine the concept of controlling PowerPoint presentations, and multimedia along with tab switching of various applications through various hand gestures. We designed Lalitha, a gesture-based recognition system that will identify gestures efficiently and control the device based on user instructions.