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Welcome to the future of airflow sensing. SONIC-1 is a bidirectional ultrasonic airflow sensor system designed for rugged environments like tunnels and underground mines. This guide gets you started in minutes â no calibration, no fuss, just real-time airflow intelligence.Â
đ§ Mounting Geometry
Position: Install transducers across the tunnel on opposite walls.
Position: Install transducers across the tunnel on opposite walls.
Height: Typically one near the ceiling, the other downstream near the floor to sample the full cross-section
Height: Typically one near the ceiling, the other downstream near the floor to sample the full cross-section
Angle: Face each other at 30â60 ° to flow (sweet-spot â 45 °) for optimal results.Â
Angle: Face each other at 30â60 ° to flow (sweet-spot â 45 °) for optimal results.Â
Distance: Ideal range up to 18m (60ft); practical maximum tested at 20m (65ft) , Baseline (hypotenuse) auto-rangesâno tape-measure entry needed.
Distance: Ideal range up to 18m (60ft); practical maximum tested at 20m (65ft) , Baseline (hypotenuse) auto-rangesâno tape-measure entry needed.
(See plan view below)
Plan view â the "Delta" diagonal path between transducers: Opposite (tunnel width), Adjacent (downstream offset), 30â60° to the flow. Pulses travel both ways along the Delta â the transit-time difference gives speed; its sign gives direction, so flow reversal is detected automatically.Â
Mounting Tip: Â Find a straight tunnel segment at least 3 tunnel-widths long.
Avoid: Corners or areas where airflow hugs the walls; centerline flow should dominate.
đ Power Up & Network DiscoveryÂ
đ Power Up & Network DiscoveryÂ
Power Requirement: 24VDC @ 200mA (4.8W total system). / 120-220V ACÂ
Default Network Mode: DHCP-enabled â device automatically requests an IP from your router.
đ Web Access & ConfigurationÂ
đ Web Access & ConfigurationÂ
Browse to http://<IP-address> to access dashboard: live flow, waveform diagnostics, parameter menus.
 "ip": "192.168.1.50"
Browse to http://<IP-address> to access dashboard: live flow, waveform diagnostics, parameter menus.
 "ip": "192.168.1.50"
đ ïž Finding Your Device Â
Option A: Use your networkâs DHCP lease table to find the assigned IP.
Option B: Use the PA Discovery Tool (PADisco):
đ ïž Finding Your Device Â
Option A: Use your networkâs DHCP lease table to find the assigned IP.
Option B: Use the PA Discovery Tool (PADisco):
type padisco --find
Option C: Configure IP manually:
EDIT microSD card system.jsn file.
Enter static IP settings, save & reboot:
"ipv4": {
  "dhcp": false,
  "ip": "192.168.1.50",
  "mask": "255.255.255.0",
  "gw": "192.168.1.1"
}
đ§ Measurement Begins InstantlyÂ
đ§ Measurement Begins InstantlyÂ
No need for manual calibration or baseline input.
True auto-ranging calculates the distance between transducers automatically.
Two signal detectors: choose between high-precision or noise-resistant filtering depending on your environment.
Modbus Registers
Modbus Registers
đ„ Downloads & ToolsÂ
đ„ Downloads & ToolsÂ
PA Discovery Tool (PADisco)
ModbusScope for Diagnostics
Full SONIC-1 Manual
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