todo

Research

• Should a 530nm photodiode be tested?
• New photodiode manufacturer
• How to increase the field of view (FOV) of a photodiode
• How to calculate the number of moles of light the plant will get
• What is the limit of moles of light we should dose the plant with?
• Can we reduce the number of LEDs?
• What standards does Cornell use for data access that we need to adhere to?

Documentation

• Collect datasheets on all current parts

Electrical

• Check that the current layout meets all documented spec. sheets
• Redesign the circuit to a circular layout
• Ensure the previous lock-in apmplifier circuit design is correct

Photodiode Testing

• Effects of angle on photodiode detection when the photodiode and LED are facing each other
• Effects of delay time on photodiode detection
• Effects on rise time delay above 20ns on photodiode readings
• Photodiode field of view inventory
• Effects of moving the plant in-between measurements
• Effects of angle on photodiode detection when photodiode and LED are in the same direction (0d)
• Effects of distance from plant on photodiode detection

Design

• Sensor-database communication
• Powering each individual sensor
• Powering to the main unit
• 'Flashlight' housing unit (waterproof)
• Mounting mechanism (hanging cable?)
• Onboard controller screen
• Battery and power housing
• Split power from one housing to multiple sensors
• Model the device in CAD

Bluetooth Mesh Network

• Find a Bluetooth library
• Basic data transfer between two PIs
• Automatic detection, addition, and saving of new nodes to the mesh network
• Automatically connect to saved nodes
• Send data through the network to the controller via the shortest path
• Public-private key trust after pairing to prevent unwanted nodes on the network
• Ensure pairing requests are not constantly sent to non-network devices

Data Reporting

• Standard deviation filter for noise smoothing before reporting the sample average from a sensor
• Cross-validation of the final time series
• Basic data transfer from controller to database (over Wi-Fi)
• API for the database server
• Realtime data display UI for the controller
• Fontend application to view, export, and analyze the data from the server/database (Github Pages?)

System Control

• Input a sampling frequency
• System should auto-detect if it is over the limit and warn the user
• System should auto-calculate how long the lights should be on for

Final Testing

• Noise validation

Other

• Name the project