Gro Bot Design Review 2 1 Green Eden

Gro. Bot Design Review 2. 1 Green Eden Christian Alfonso (EE), Katie Costley (ME), Tai Doan (CPE), Garrett Search (ME/ASE), and Samantha Search (ME)

Gro-Bot Green Eden: Christian Alfonso (EE), Katie Costley (ME), Tai Doan (CPE), Garrett Search (ME/ASE), Samantha Search (ME) Concept: Objectives: • To provide urban office spaces with access to fresh produce An automated gardening system on 2 axes to navigate and increase employee happiness and productivity. • To reduce the cost of manual labor by fully automating the garden bed that will: gardening process. • Plant seeds throughout the garden bed when requested • Perform watering and other maintenance of specified plants Approach: Construct a two-axis rail system that will control the following plant care modules: • A modular seed dispensing head that can release a small amount of seeds at a time • A permanent water dispensing system • A modular fertilizer dispensing head • Automate the switching of modules to perform needed plant care based on a user set schedule Draft of Gro-Bot design concept. Includes two planting beds, lengthwise stationary rail, extending arm, and module exchanging station. Budgeting: • Total spent so far: $440. 71 • Total expected expenses remaining: $259. 32 • Total external funding: $750 • Funding Request: $0

Basic Device Functionality Automated Gardening System • • • 2 -Axis V-Rail Frame Modular Head System UI to Manage Garden The system will… • • • plant seeds at a specified location release exact amounts of water/fertilizer maintain itself with minimal user interaction not be visually or acoustically offensive include safety features, such as an e-stop At the end of Winter Quarter, the device is expected to meet all functional specifications except accuracy of seed dispensing, UI feedback, system reset, visual aesthetic, and system uptime.

Functional Specifications - Mechanical Spec ID Requirement Threshold Objective Validation E 001 Number of Seeds Dispensed ≤ 10 seeds/turn ≤ 2 seeds/turn Visual Inspection E 002 Accuracy of Seed Dispensing ≤ 2 in from the ≤ 1 in from the expected location E 003 Water Flow Rate 0. 05 l/s 0. 15 l/s Timer and Bucket M 001 Seed Head Access ≤ 3 min ≤ 1 min Trial Use D 003 Bed Size Variability Nonfixed Rail Length - Adding Rail Length S 003 Water Valve Position Closed w/o Power - Observation Tape Measure

Functional Specifications – Electrical Spec ID Requirement Threshold Objective Validation M 002 System Reset Access Reset Button and UI Observation D 004 Feedback to UI 30 min ± 10 sec 15 min ± 10 sec Timer S 001 Emergency Stop Prevent Power Supply - Testing

Functional Specifications - General Spec ID Requirement Threshold Objective Validation ME 003 System Uptime 3 months 6 months Component Analysis D 001 Visual Aesthetic Average Rating: 6/10 Average Rating: 8/10 Survey D 002 Noise Aesthetic ≤ 60 d. B(A) ≤ 25 d. B(A) d. B Meter S 002 Speed of Arm ≥ 4 ft/min ≥ 8 ft/min Timer and Measurement C 001 Consumer Cost ≤ $4800 ≤ $2400 Estimation and Bo. M C 002 Manufacture Cost ≤ $2400 ≤ $1200 Estimation and Bo. M

Electrical Block Diagram

PCB Design – Main Board

SW/FW Block Diagram

Software Routine

Mechanical Drawings – Rail Mount

Mechanical Drawings – Motor Mount

Mechanical Block Diagram

Summary of Analyses Updated Analyses in Red, unchanged Analyses in Green Fall Quarter Analyses: • • Weight of Functional Head Power Requirements Sensor Data Acquisition Water Consumption Requirements Sensors IP Rating Cost Re-Analyses Required: • Water Flow Rate • Motor Power Requirements Winter Quarter Analysis: • Database: Determine which database service to use for when we start building our User-Interface app

Water Flow Rate Re-Analysis Variable Decided/Expected Value Hose Diameter (in) 5/8 Flow Rate from Hose (l/s) 1. 6 Tube Length (ft) 25 Tube Diameter (in) 1/4 Expected Flow Rate (l/s) 0. 18 Watering Time per Garden Bed (min) 9. 4 Reason for Re-Analysis: Change in tube diameter Purpose: To determine the friction factor through tube based on expected tube dimensions and utilized this to determine expected head loss in the system and thus the final flow rate Result: This is reasonable considering our water consumption requirements

Motor Power Requirements Re-Analysis Reason for Re-Analysis: Error in the initial calculation method Purpose: To utilize the weight of the functional head and estimated velocity of arm in order to determine the required power

New Analysis - Database Purpose: To determine the database service to store data for our system. Method: Extra research about price and complexity will be done in order to make a final decision. Current options: SQL and Firebase.

Project Demonstration Plan At the end of winter quarter we will demonstrate the following: 1. An automated gardening system meeting most specifications 2. A system prototype that demonstrates the ability to perform all critical features, such as movement, dispensing, and switching heads 3. A system prototype that includes safety features, such as an emergency stop We do not expect to meet the accuracy of seed dispensing, UI feedback, system reset, visual aesthetic, and system uptime specifications, but we will clearly demonstrate the ability to meet those in Spring

Questions?