The project Community Environmental Observation Network (CEON) was dedicated to the development of a free sensor network to collect environmental data (e.g. ground shaking, climate data). It was intended develop the proof-of-concept for a system allowing to collect dat with contributions from citizen, research institutions or public authorities like communities or schools. The collected data should lead to a large data basis which can be used for public information, research, and arts.
A prototype of an open design seismograph based on the Arduino Mega2560 microcontroller board and the BeagleBone Black single-board computer was developed. Most work went into the development of a sensitive analog to digital conversion to meet the needs of scientific data collection. Four stackable printed circuit boards (PCB) fitting onto the Arduino were designed:
- Power Supply Shield (PSS)
- This PCB does the main power supply conditioning.
- GPS Timing Shield (GTS)
- The GPS timing shield has a ublox LEA-6T GPS module which is mainly used to provide a GPS disciplined clock signal to the analog to digital converter (ADC). It moreover provides a puls-per-second signal for accurate time stamping of the recorded data and it has the possibility to log single-phase raw data for differential positioning.
- ADC Main Shield (AMS)
- The analog to digital conversion happens on this shield. The Texas Instruments ADS1274 analog to digital converter (ADC) is used. It is a 4-channel, 24 Bit Delta-Sigma ADC.
- Analog Interface PGA Shield (AI-PGA)
- The analog interface shield has a programmable gain amplifier (PGA) and an active 5-pole anti aliasing filter. The PGA Texas Instruments PGA281 is used.
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