BLOG# 3 -Edible Algae System - (Growing Spirulina in space)

Research Instrumentation

version 1.1

This is my 3rd blog post in a series of blog post for the Design Challenge 1 Meter of Pi

,<<< PREVIOUS BLOGNEX BLOG  >>

Blog# 2 EAS - System Concepts

Blog# 4 EAS - Research and Unboxing of the challenge kit

 

 

Introduction

  • The Blog will include my research on Instrumentation needed including the Challenger kit, to aid in growing of Spirulina in the Growing Housing (GH) Unit.
  • The following instruments and sensors will be used in the system.
  • The Challenger kit usage will be described in another blog post.

 

Parts List

This is a list of parts needed to implement the growling process of Spirulina in 1 of the four Growing Housing Units in the system.

 

Growing Environment Unit Parts.

  • 20 gallon Tank
  • LED Lamps
  • Aquarium Heater
  • Aquarium thermometer
    • Temperature probe
  • Aquarium Air Pump
    • Air tubing/diffuser w/ check valve.
  • PH Probe
  • Mesh Tank Cover with Velcro fasteners.

Growing Housing Parts

  • Small Heater
  • 2 small computer fans.
  • Power strip
  • Extension chord

Controller Unit Parts

  • 2 Raspberry Pi 4 2GB
  • PIM487 Automation HAT Mini
  • PIM486  Enviro HAT for Raspberry Pi
  • PIM300  PICO HAT Hacker

 

Parts Descriptions

The following sections describe each part and when applicable, give inks to suggested parts available on the internet.

Growing Environment Unit Parts.

  • 20 gallon Tank

    • A 20 gallon can be used to grow your spirulina.
    • You can pick one up at your local pet store.
  • LED Lamps

    • The Amount of light exposure can have a direct effect on growing Spirulina
      • Studies show it can improve the growth rate:
      • a light can be turned ON every hour for 45 minutes and OFF fo r15 minutes from 7am to 10pm
      • You will use the controller to switch on/off the light
        • you can use any light source and can place the lamp on the top or side of the tank.
  • Maintaining the Temperature of the water

    • Aquarium Heater

      • an aquarium heater is a self contained heater/thermostat that is used to regulate the water temperature in a fish tank.
      • Get one with a thermostat that allows setting it to a range of between 8C (46.4F) AND  45C (113F),
        • studies have found that the ideal temperature is 35C (95F) and you want to make sure you can set it to this temperature.
        • Then you can turn the heater on/off with the readings from a probe sensor, placed in the tank to regulate he ideal temperature to grow the Spirulina. The thermostat will  assure that the tank is never overheated. acting as a safety valve.
        • You can order one on the internet SALUTE Aquarium Heater
        • I couldn't find a model that had a thermostat upper setting of 35C (95F).
      • Or you can select a model without a thermostat and not have a safety valve.
        • you can also monitor the temperature by reading a probe sensor.
        • You can order one on the internet FINNEX THS
    • Temperature Probe Sensor

      • is used to obtain the temperature of the water in the tank
      • It will record the temperature of the water.
      • It is used to maintain the temperature of the water by switching the heater on/off when the water temp hits the ideal temperature of  35C (95F)
      • There is one available on the internet DB18B20+(waterproof temperature sensor)
      • It also has a raspberry PI project to connect it and program it  Here
  • Aquarium Air Pump

    • Oxidization in the water can be obtained by switching On/Off an AIR Pump attached to a hose in the tank.

    • Check the Ph with a sensor
    • The PH level should be between 9 and 11
    • Adding baking soda can be used to bring up the alkalinity.
  • Mesh Tank Cover with Velcro fasteners. (Optimal)

    • The cover is used to cover the tank to keep unwanted material out. The Velcro is used to attach it to the tank]

Growing Housing Parts

The following parts will be used inside the Growing Housing (GH) to maintain an ideal environment outside of the Growing Environment Unit. (GEU).

  • Small Heater

 

    • A small personal heater is sufficient to heat the quitter meter cube.
  • 2 small computer fans.

    • the fans will be used for air intake and air outtake in and out of the growing housing unit.
  • Power strip

    • A power strip to plug everything iin.
  • Extension chord

    • Extension cords to run from the power strip inside to a wall outlet outside the Growing Unit.

 

Controller Unit Parts

The following  Parts have been provided by element14 to me for this design challenge. I have included a link to order these parts for your project.

The kit  BUY NOWThe SpecsNotes

Raspberry Pi 4 2GB

BUY NOW

 

2 units required for this design

  • 1.5GHz 64-bit quad-core ARM Cortex-A72 CPU ( ARM v8, BCM2711B0)
  • 2GB RAM (LPDDR4)
  • On-board wireless LAN - dual-band 802.11 b/g/n/ac
  • On-board Bluetooth 5.0, low-energy (BLE)
  • 2x USB 3.0 ports, 2x USB 2.0 ports
  • Gigabit ethernet
  • 40-pin GPIO header
  • 2× micro-HDMI ports (up to 4Kp60 supported)
  • H.265 (4Kp60 decode)
  • H.264 (1080p60 decode, 1080p30 encode)
  • OpenGL ES, 3.0 graphics
  • DSI display port, CSI camera port
  • Combined 3.5mm analog audio and composite video jack
  • Micro-SD card slot
  • USB-C power
  • used as a MCU to construct a Controller Unit.
  • The hats included in the kit will be attached.
  • The temperature probe will be attached.

PIM487  Automation HAT Mini

BUY NOW

 

  • 0.96" colour LCD (160x80)
  • 1 x 24V @ 2A relay (NC and NO terminals)
  • 3 x 12-bit ADC @ 0-24V (ADS1015) (±2% accuracy)
  • 3 x 24V tolerant buffered inputs
  • 3 x 24V tolerant sinking outputs
  • 3.5mm screw terminals
  • Pimoroni breakout-compatible pin header
  • Mini HAT-format board
  • Fully-assembled (no soldering required)
  • Compatible with all 40-pin header Raspberry Pi models
  • Python library
  • Dimensions: 65x30x16.8mm
The hat will be used to connect parts in the growing environment Unit to the controller unit

PIM486 Enviro HAT for Raspberry Pi

BUY NOW

  • BME280 temperature, pressure, humidity sensor (datasheet)
  • LTR-559 light and proximity sensor (datasheet)
  • MEMS microphone (datasheet)
  • 0.96" colour LCD (160x80)
  • Pimoroni breakout-compatible pin header
  • pHAT-format board
  • Fully-assembled
  • Compatible with all 40-pin header Raspberry Pi models
  • Python library
  • Dimensions: 65x30x8.5mm

THe Hat will be used to connect parts in the Growing Housing to the controller unit

The light, temperature and humidity, sensors on the hat will be used to maintain an ideal growing environment in the Growing Unit.

PIM300PICO HAT Hacker

BUY NOW

  • BCM and descriptive pin labelling
  • Mounting holes (M2.5)
  • 0.8mm thick PCB
  • Compatible with all 40-pin header Raspberry Pi models

 

Conclusion and summary

  • This blog has listed the Parts needed for the system
  • It has described all the parts needed.
  • The next Blog will include my research and Unboxing of the Challenger kit to aid in the growing of Spirulina in the Growing Housing. GH Unit

 

,<<< PREVIOUS BLOGNEX BLOG  >>

Blog# 2 EAS - System Concepts

Blog# 4 EAS - Research and Unboxing of the challenge kit