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To see the CAD and code used, please refer to our CAD page and GitHub respectively.
Embedded Files
Design Iterations
Design Iterations
Risk Reduction Test
Risk Reduction Test
Initial Setup for testing:
Durability of syringe
Wear of the seal
Pressure sensor readings
Preliminary Actuator design
Rack-and-pinion, driven by stepper motor
Iteration 1
Iteration 1
Improvements
Syringe driven by linear actuator
more compact design
Issues
Need a better method of saving data from sensors
incompatible with different syringe sizes
Proof of Concept
Proof of Concept
Improvements
Linear actuator controlled with PWM instead of RS485 → UART
Increased compatibility with syringe piston
Web App to display/export live data from sensors
Switch from Arduino → ESP32:
More serial ports and can use Bluetooth.
Issues
Lacks a user interface
Preliminary Design
Preliminary Design
Improvements
GPIO and Web ESP communicate through Serial port to adjust shared parameters
PCB prototype to consolidate two ESP's
attachment holes added to syringe-actuator mount
Issues
Pressure leak from sensor-manifold connection and glass syringe
Female sockets are on wrong side of PCB and have interference between USB-C and cables
Need to add calibration feature for initial positions and safety
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