This is a Fritzing wiring diagram for what appears to be a ground-vibration recording circuit—a basic electronic seismometer. It shows a proposed breadboard assembly, rather than a photograph of working hardware.
The project’s filename is “PowerRail_all_capacitors.fzz.”
Visible component | What it does |
Geophone, the cylinder at the top | Converts mechanical vibration into a small electrical signal. It could detect ground movement, footsteps, machinery vibration, or similar disturbances. |
Adafruit ADS122C04 board, at left | Converts the sensor’s analog voltage into digital measurements. This is a 24-bit analog-to-digital converter with an I²C interface for communicating with a controller or computer. |
A0 and A1 connections, labeled white and yellow | Appear intended to measure the voltage difference between the geophone’s two signal paths. |
R4 and R5, each 1 kΩ | Appear to be series input resistors that work with the capacitors to filter the signal and limit input current. |
C4, 2.2 µF, the large red component | Explicitly annotated “across A0 & A1.” In that position, it helps filter higher-frequency noise from the measured signal. |
10 kΩ resistors and smaller capacitors | Appear intended to establish and smooth a bias voltage—a steady reference level that keeps the sensor signal within the converter’s operating range. |
Breadboard and jumper wires | Allow the circuit to be assembled and changed without soldering. |
The converter’s identification and capabilities are confirmed by Adafruit’s documentation. Its 24-bit specification describes its digital resolution; it does not guarantee 24 bits of usable measurement accuracy. Adafruit Learning System
What it accomplishes: The intended sequence is that vibration moves the geophone, the geophone produces a small voltage, the resistor-and-capacitor network conditions that voltage, and the converter turns it into numbers. With a connected controller and suitable software, those numbers could be recorded or displayed as a vibration trace.
A particularly meaningful detail is the 2.2 µF capacitor across the two inputs. If each input reaches the geophone through one of the 1 kΩ resistors, that combination has an approximate low-pass cutoff of 36 Hz, ignoring the geophone’s own impedance and other loading. That would favor relatively slow vibrations while reducing higher-frequency signals.
The screenshot shows the intended design, not proof that it works or is correctly wired. Parts of the circuit and annotations are cut off, and neither the controller nor its software is visible. A full schematic would be needed to verify the bias connections, capacitor placement, and overall electrical operation.