Active composting reaches 55-70C during the thermophilic phase, killing pathogens and weed seeds. Temperature monitoring helps manage piles for maximum decomposition efficiency.
Why Compost Temperature Matters
Proper composting requires 55-65C for 3+ days to kill pathogens. Below 45C: inadequate sanitisation. Above 70C: kills beneficial organisms. Temperature monitoring guides turning decisions and identifies problems.
The Temperature Cycle
Fresh pile: rises to 55-65C in 3-5 days (thermophilic). Maintains for 1-3 weeks. Drops as material consumed. Second heating possible after turning. Curing phase: near ambient for 4-8 weeks.
Sensor Selection
DS18B20 waterproof probes withstand compost temperatures up to 125C. Stainless housing resists corrosive conditions. Multiple probes at 10, 40, and 70cm depths on single OneWire bus.
Multi-Probe System
3-5 DS18B20 probes on rigid PVC pipes inserted into pile. Arduino Nano + SD card logs every 15 minutes. Total cost under Rs 1,500.
Turn Schedule from Data
Turn when core drops below 45C after peak, or when >70C. Typically every 3-5 days first 2-3 weeks, weekly for 4-6 more weeks. Data-driven turning produces finished compost 30-40% faster.
Vermicompost vs Hot Compost
Hot compost: high temperature, fast (8-12 weeks), DS18B20 probes essential. Vermicompost: worms require 15-25C, DHT22 monitors ambient conditions. Above 35C worms die.
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Frequently Asked Questions
Target temperature?
55-65C for pathogen kill. DS18B20 handles up to 125C.
Probe depth?
10cm surface, 40cm middle, 70cm core for temperature gradient.
When to turn?
When core drops below 45C or exceeds 70C. Typically every 3-5 days initially.
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