ECE Senior Design: Team 2021 Mobile Hand-held Tissue Compression Tester Truc Minh Nguyen, Dhaval Patel, Camila Leyva Sponsor: Matthew Eschbach [Medtronic] Advisor: Dr. Abhishek Dutta Mechanical Engineering (ME): Daniel Osborn Clark Giraldez Devon Casazza 04/27/2020
Background / Objective Tasks: ECE: Controller design ➔ and programming Transfer Data ➔ Internal Hardware ➔ ME: Physical device ➔ design D. Seeger, "ECNMag," 15 05 2017. [Online]. Available: https://www.ecnmag.com/article/2017/05/medtronic-takes-surgical-staplers-next-level-signia. [Accessed 23 10 2019].
Layout for System Motor with Encoder attached Speed Controller Microcontroller Load Cell HX711 Battery
Calibration ● Encoder value must be set to 0 when fully closed ● When device is on, the motor will start to close ● When clamps are closed current will spike Use Vx-Vy/57 to calculate current ○ ○ Nodes must be after load since arduino can only handle 3.3v ● If the current > 3A then the encoder value is set to zero Buffer in place so it will calibrate only once (code) ○
Block Diagram Proportional, Integral, Derivative (PID) Speed Controller using PID Library in Arduino ➔ ➔ Position Controller consists of 3 zones for limiting the motor’s speed depending on the motor’s current distance from the target position.
Results This is the motor’s position [rad] vs. the number of samples with a sample time of 10ms. The target position is 30 radians.
Results Cont. This is a graph of the motor’s speed [rad/s] vs. the number of samples with a sample time of 10ms.
Data Retrieval & Transfer Above is a simple diagram showing how the load cells would be set up with the load cell amplifier which are then connected to to the Arduino.
Data Retrieval & Transfer Example of what user will see and verify Example of what the table with the data in excel will show and how it is organized. before starting device to ensure data transfer is correct. “PLX – DAQ,” Smart Football Helmet , 30-Apr-2017. [Online]. Available: https://smarthelmet2017.wordpress.com/plx-daq/.
Constraints Two majors; one team ➔ Compatible parts ➔ Motor, battery, load cell ◆ Footprint (Electronics) ➔ User-friendly ➔ UConn closing means no access to ➔ labs/resources ◆ Must have multiple working prototypes for each group member to work on outside of lab
Project Management Team 2021 Project Tasks Camila Minh Dhaval Dr. Dutta Medtronic ME System Modeling and Simulations A R A C I I Controller Design A R A C I I Circuit Design A A R C I C Data Log and Transfer R A A C I I Website R A A C I I Schematic A A R C I C
Timeline of Project Tasks Fall 2019
Timeline of Project Tasks Spring 2020
Part List and Final Cost No specific budget was given from Medtronic ➔ Quality over cost ◆ Microcontroller x2 = $44.00 ➔ Breadboard x2 = $ 50.00 ➔ Motor = $62.78 ➔ Load Cell = $150.00 ➔ Encoder = $64.00 ➔ HX711 x 2 = $18.75 ➔ Speed Controller = $23.00 ➔ DC Voltage Power Supply = $21.00 ➔ Switches = $15.00 ➔ Expect to spend $448.53 + battery testing cost ➔
References D. Seeger, "ECNMag," 15 05 2017. [Online]. Available: https://www.ecnmag.com/article/2017/05/medtronic-takes-surgical-staplers-next-level-signia. [Accessed 23 10 2019]. A. Aqeel, "theengineeringprojects," 7 March 2018. [Online]. Available: https://www.theengineeringprojects.com/2018/03/introduction-to-pcb.html. [Accessed 19 October 2019]. H. Javdan, "Circuits Central," 12 September 2017. [Online]. Available: https://circuits-central.com/pros-cons-printed-circuit-boards/. [Accessed 19 October 2019] F. McNamara, "Our Life Simplified," 18 August 2017. [Online]. Available: http://ourlifesimplified.com/advantages-and-disadvantages-of-printed-circuit-boards-and-pcb- assembly/. [Accessed 19 October 2019]. "Servo Components," Pittman Motors, 2019. [Online]. Available: http://www.servocomponents.com/Pittman-Gear-Motor-GM9000-series/gm9236s025-r1. [Accessed 12 November 2019].
References "Amazon," DIYmall, [Online]. Available: https://www.amazon.com/DIYmall-Weighing-Conversion-Sensors-Microcontroller/dp/B010FG9 RXO/ref=pd_bxgy_328_img_2/131-4797627-3428420?_encoding=UTF8&pd_rd_i=B010FG9R XO&pd_rd_r=9f7a70bd-8f48-474a-a1e1-18746b05dbf7&pd_rd_w=Dhrls&pd_rd_wg=laTiV&pf_ rd_p=09627863. [Accessed 20 10 2019]. "Amazon," D&Y, [Online]. Available: https://www.amazon.com/Pressure-Force-S-type-Sensor-Cable/dp/B01F6IOWB8/ref=asc_df_B 01F6IOWB8/?tag=hyprod-20&linkCode=df0&hvadid=385655097590&hvpos=1o2&hvnetw=g& hvrand=13631962868300790835&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint =&hvlocphy=900327. [Accessed 20 10 2019]. "ThingSpeak," The MathWorks, Inc, 2019. [Online]. Available: https://thingspeak.com/pages/commercial_learn_more. [Accessed November 2019]
Questions/Comments? Thank you for listening!
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