5/27/2017 -

I got my first set of sensors in the mail. At a high level, my though process is:

• Temperature sensor to measure compost - healthy compost must reach a temperature of 140 F for 20-25 days
• Moisture sensor - compost should be 40-60% moist
• Methane Sensor - a high PPM reading would indicate that the compost is in an anaerobic cycle (similar to a landfill)

I also have a few actuators

• solenoid valve to support gravity drip of water (if moisture is below 40%)
• servo - to open/close a vent to a perforated pipe embedded in the compost (to support additional oxygen and air flow

Finally, I am using a Arduino 101 as the micro-controller for the sensors and actuators. I will use a Raspberry Pi to persist the data and make it available in a web page. I'll use BLE for communication between to the for the prototype (will need to move to LoRa for the final product.