Design of seismic sensor board coupled with a wireless
node is detailed. The essential part of the design is its low
power consumption due to relatively low resolution ADC.
While similar designs utilize much higher resolution such
as 24-bit, they consume too much power which makes them
less preferable in a battery-powered wireless sensor network
application.Our 12-bit ADC implementation requires careful
preamplifier and filter designs. System sensitivity and maximum
disturbance velocity are calculated. PSpice simulations signals due to footsteps at varying distances, and with as low
as 3000 amplification, seismic signals above noise floor due
to footsteps can be observed at 15m.