Darian Johnson
Published © CC BY-NC

The Compost Professor: A Smart Composting System

A set of senors and actuators that make composting simple.

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The Compost Professor: A Smart Composting System

Things used in this project

Hardware components

Adafruit Huzzah Feather
Needed for Base Unit and Kitchen Unit
×2
Adafruit RFM69 32u4 Feather
Needed for Compost Unit
×1
Compost Unit 3D prints
see GitHub for STl files
×1
Compost Bin
any large compost tumbler will do.
×1
Base unit case
see GitHub for STL files
×1
Assorted cables (solid and stranded wire), headers, resistors, etc
Details about the needed components will be listed in the build instructions
×1
Rubber spray-on
Used to water proof 3D prints
×1
USB wall chargers and cables
For Base System and to recharge LiPo battery in kitchen system
×2
Adafruit TFT Featherwing
Needed for Kitchen Unit
×1
7mm tall (6mm x 6mm base) tactile button
Needed for Kitchen unit - wake-up button
×1
6mm tall (6mm x 6mm) tactile button
Needed for Base unit - reset button
×1
SPDT Slide Switch
Kitchen Unit on/off switch
×1
0.1uF capacitor
Kitchen Unit - for batter measurements
×1
Lithium Ion Polymer Battery - 3.7v 500mAh
Kitchen Unit
×1
Kitchen Unit case
See GitHub for STL files
×1
3mm Red/Yellow-Green RGB
Base Unit status indicator
×1
SG90 Micro-servo motor
SG90 Micro-servo motor
Compost Unit - Controls air vent
×1
Mounting Putty, Silicone compound, glue, etc
×1
Hand tools (drills, screwdrivers, soldering iron, etc)
×1
Heat shrink and heat gun
×1
DS18B20 Waterproof Temperature Sensors
Compost Unit - Measures Compost Temp
×1
DFRobot Gravity: Analog Capacitive Soil Moisture Sensor- Corrosion Resistant
Compost Unit - Measures Compost Moisture
×1
Micro Submersible Water Pump DC 2.5-6V
Compost Unit - Water pump to hydrate compost
×1
JST 2-pin cable
Compost Unit - to connect battery
×1
Tilt Switch
Compost Unit - Determine compost bin position
×1
TIP120 Darlington transistors
Compost Unit - for water pump
×1
470uF capacitor
Compost Unit - for servo
×1
Silicone Adhesive
to seal 3D prints
×1
Rubber Spray On Coating
Used to weather-proof the electronics box used in the Compost Bin. I used Flex Seal -> https://www.target.com/p/as-seen-on-tv-174-flex-seel-aerosol-can-14oz/-/A-14028913?sid=1430S&ref=tgt_adv_XS000000&AFID=google_pla_df&CPNG=PLA_Kitchen+Shopping_Local&adgroup=SC_Kitchen&LID=700000001170770pgs&network=g&device=c&location=9026937&gclid=CjwKCAjw64bPBRApEiwAJhG-fp0v4YcBCb9MpoSqDkfArNVC_BmjwsiXnM5B_zF7GW_6izFhk7t8YBoCOMsQAvD_BwE&gclsrc=aw.ds
×1
5-6 feet of Vinyl Hose (3/8 in inner diameter)
Be sure to check the outer diameter of your pump. This hose will attach to the pump
×1
1 foot 1 1/4 inches spa hose
Used to connect the reservoir to the spigot
×1
Adafruit RFMM68 Feather Wing
Needed for Base Unit
×1
Waterproof 3xAA Battery Holder with On/Off
Compost Unit - powers unit
×1
1N4001 Diode
Compost Unit - for pump
×1
Water Level Sensor Vertical Float Switch
Compost Unit - to determine water level
×1
Slimline water container
Compost Unit - water reservoir
×1
Plastic soda bottle tops
Used for 3D prints
×3

Story

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Custom parts and enclosures

Thingiverse

https://www.thingiverse.com/thing:2586719

Credits

Darian Johnson

Darian Johnson

7 projects • 100 followers
Technologist. Music lover. Fitness enthusiast. Movie buff. Fan of sci-fi and comic books.

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