infusion pump pcb

Infusion pump project is an electromechanical system designed for precise vertical reaction-based fluid delivery. The project involves a large syringe controlled by an ESP32 microcontroller, which regulates the flow rate, total volume dispensed, and operation time. A 17HS4401 stepper motor, driven by an A4988 stepper motor driver, provides precise linear motion to the syringe plunger, ensuring accurate and consistent fluid flow. The system is powered by a 12V DC adapter, which supplies necessary power to the motor and electronics.

Mechanical Design

The syringe is mounted on a stable frame, with motion guided by a lead screw (8mm diameter) and supported by 608ZZ bearings (8x22x7mm) for smooth and low-friction movement. The stepper motor, coupled with the lead screw, drives the syringe plunger forward and backward to control liquid flow. Given that this is a vertical reaction-based system, maintaining stable and vibration-free operation is crucial to prevent inaccuracies in fluid delivery.

Electronics and Control

The ESP32 acts as the primary controller, executing commands received from a local website interface running on the user’s laptop. The interface allows real-time adjustment of flow rate, time, and total volume while displaying the computed live volume flow. The use of a DHT11/DHT22 sensor helps monitor environmental conditions, ensuring the system operates under optimal temperature and humidity settings. Additionally, a MAX30102 pulse sensor is integrated for potential future applications, such as biometric monitoring or system enhancements.

Software and User Interface

The web interface provides a user-friendly platform for monitoring and controlling the infusion pump. It communicates with the ESP32 via Wi-Fi, enabling remote operation. The system is programmed in C++ (Arduino framework) for microcontroller control and JavaScript, PHP, and HTML for web-based interaction.

This infusion pump is a well-balanced combination of mechanical precision, electronics, and software, making it a highly effective solution for controlled fluid delivery applications.