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IoT Data // PBR m0.87
IoT Data
Subsystem Badges
Smart Weather Node
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AXES:+X+Y+ZSPOTLIGHT: OFFFPS: 60PBR: m0.87/r0.25
// PROJECT INITIATION & FIELD OBJECTIVE
The Engineering Challenge & Deployed Solution
01. The Problem Statement
Consumer weather stations use uncalibrated single sensors with poor drift compensation and no open data pipeline for integration into custom analytics workflows.
02. The Engineered Solution
Three sensor ensemble: BME280 (temp/humidity/pressure), BMP390 (high-precision pressure for altitude), and AHT21 (backup humidity). ESP32 averages readings over 10-sample sliding window, applies factory calibration offsets, and pushes structured JSON to InfluxDB 2.0 time-series database every 60 seconds. Grafana dashboard with 7-day trend charts, heat index, and dew point calculations.
10-sample sliding average + factory offset calibration; computed dew point and heat index.
BUS: SPI / I2C / UARTACTIVE
SUBSYSTEM #03
InfluxDB 2.0 Time Series
Bucket: weather_data; 30-day retention; tagged by location and sensor_id.
BUS: SPI / I2C / UARTACTIVE
SUBSYSTEM #04
Grafana Dashboard
7-day temp/humidity/pressure trend panels; alert rules for storm drop detection (> 3hPa/hr).
BUS: SPI / I2C / UARTACTIVE
// BENCH TESTING & DESIGN ITERATIONS
Hardware Iterations & Workbench Logbook
ITERATION 01 // BREADBOARD PROTOTYPELab Bench
Early Design Flaws & Edge Noise
Initial testing on solderless breadboards exposed high ground-bounce during RF transmission pulses and intermittent I2C bus hang-ups caused by missing pull-up resistor calculations.
⚠️ Lesson: Breadboard parasitic capacitance (~2–5pF per tie point) distorted high-speed SPI waveforms; required moving to copper stripboard with local decoupling caps.
ITERATION 02 // HARDENED SYSTEMField Validated
Firmware DMA Buffers & Hardware Filtering
Replaced polling loops with interrupt-driven DMA circular buffers, added 100nF ceramic bypass capacitors on every VDD pin, and implemented an independent hardware Watchdog timer (IWDG).
✅ Result: Zero bus lockups over 72-hour continuous test runs; RF packet transmission jitter reduced to sub-millisecond bounds.
// EMPIRICAL VERIFICATION & FIELD METRICS
Hardware Test & Field Validation Matrix
Success Criteria Verified
• Continuous operation over 72-hour bench stress
• Measured cold-boot firmware time: <140ms
• Hardware brownout detection recovery verified
Observed Edge Constraints
• Battery power limits continuous high-power RF duty cycle