Journal: Sensors (Basel, Switzerland)

Article Title: Low-Cost Sensors for Urban Noise Monitoring Networks—A Literature Review

doi: 10.3390/s20082256

Figure Lengend Snippet: Main characteristics of low-cost noise sensors detailed in the literature: node based development platform, quantization level of the MCU, ’N-2-S’ node-to-sink data transmission protocol, ’Mic’ microphone type (ECM, analog MEMS (a-M), digital MEMS (d-M)), ADC quantization and sample frequency, power supply (battery (B), AA and LR20 cells (AA-B or LR20-B), battery with solar panel (B/S), wired connection (W) and energy autonomy in parenthesis when concerned and available (in days or hours)), pre-processing (Z, A or C weighting (Z-w, A-w or C-w), gain amplification (G), calibration (Cal), frequency equalization (Eq), 1/3 or 1/1 octave band analysis (1/3 or 1/1), encoding (enc)), price (in Euros (EUR), United States dollars (USD), Great Britain pounds (GBP)), goal of the corresponding article (proof-of-concept (POC), sensor design only, operational WSN (Op-WSN)).

Article Snippet: Initially, the authors used a Tmote Sky platform (Moteiv), made of a microcontroller unit (MCU) (Texas Instruments MSP430 with a 16-bit RISC central processing unit (CPU)) equipped with a multimodality sensor board (EasySense SBT80) and an omnidirectional condenser microphone (ECM) (EM6050P-423) [ ].

Techniques: Transmission Assay, Battery, Amplification