DIY Seismometer: Build Your Own Simple Earthquake Detector
A DIY enthusiast built a seismometer using a sensitive geophone of their own design, an LM358 op-amp circuit for signal amplification, an Arduino for capturing the output, and NERdaq software for plotting the results on a PC. The setup has been reliably visualizing earthquake activity for over 6 years, providing an accessible way to understand geology despite not being calibrated for scientific accuracy.