# NL Sensor — Stream live sensor data

> Stream live sensor data (iPhone/iPad app by Nu Lambda Scientific Company Limited.)

- Source: https://appshunter.io/ios/app/nl-sensor/id6792283356 (this page in markdown: same URL + `.md`)
- Developer: [Nu Lambda Scientific Company Limited](https://appshunter.io/developer/6792283358)
- Category: Education, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-07-28
- Data updated: 2026-10-09
- User reviews in markdown: https://appshunter.io/ios/app/nl-sensor/id6792283356/reviews.md

## What is NL Sensor?

NL Sensor turns your iPhone or iPad into a live dashboard for Nu Lambda Scientific Bluetooth sensors. Connect a sensor, watch the data stream in real time, analyze it on the spot, and export it — all on device, with nothing sent to the cloud.

MEASURE ANY SENSOR IN THE FLEET • Motion / distance, force / load, voltage, current, pressure, illuminance, 3-axis magnetometers, dual-thermistor temperature probes, and photogates are detected automatically by name. • Metric cards show the current value and a stable 40-point average. • Set the sample rate from 1 to 100 Hz right from the app.

LIVE CHARTS BUILT FOR THE LAB • A smooth 10-second sliding window while you measure. • Pause to pan and pinch-zoom — each axis zooms independently, so you can stretch time or values on their own — then show all data, reset, or clear. • Drag to select a region and get a least-squares linear fit (slope, intercept, R²) or statistics (mean, standard deviation, count). • Expand any chart to full screen.

MOTION, VELOCITY & ACCELERATION • Motion sensors add derived velocity (m/s) and acceleration (m/s²) charts, computed with smoothed derivatives.

PRESSURE & TEMPERATURE • Pressure sensors add a Temperature-vs-Time chart and a Pressure-vs-Temperature graph, with a fine ±0.1 hPa scale for reading small changes.

DUAL TEMPERATURE • Dual-thermistor probes show T₁ and T₂ together on one chart plus a separate chart for each, colour-coded red and green.

PHOTOGATE EXPERIMENTS • A photogate sensor turns beam-block timing into seven ready-made experiments: Basic Free Fall, Single Gate, Two-Gate Timer, Pendulum Period, Speed (two-stripe card), Pulley, and Two Gates. • Get distance–time and speed–time graphs, oscillation periods with average and spread, angular motion from a pulley, and precise gate timing — then linear-fit a speed–time graph to read acceleration straight off the slope.

WALK THE GRAPH • Turn distance-time graphs into a movement challenge: pick a target curve, walk to match it, and get a live score for how well your motion tracks the graph. Five graph sets from basic to creative.

TWO SENSORS AT ONCE • Connect two sensors and compare them on an XY chart that pairs their latest readings in real time. • Pause the XY chart to pan, pinch-zoom, drag-select a range for a linear fit or statistics, and tap any point to read its A / B values.

TONE GENERATOR (NO SENSOR NEEDED) • A built-in signal generator, open straight from the dashboard. Play a pure sine tone from 0.5 Hz to 20,000 Hz with a slider, exact numeric entry, and a fine/coarse adjust pad. • Run a frequency sweep (chirp) with your own start, final, step size and step duration, and a live progress bar — great for hearing tests, resonance hunts, and Doppler demos. • Switch to Dual Tone to sound two independent tones at once for beats, musical intervals, superposition, and masking. Set amplitude and output channel (both, left, or right) for each tone.

EXPORT EVERYTHING • Export any chart, the XY data, or the entire session as CSV through the iOS share sheet.

PRIVACY • All measurements stay on your device. No account, no tracking, no data collection.

NL Sensor requires a compatible Nu Lambda Scientific Bluetooth sensor. A built-in demo mode lets you explore the app without hardware.


## Version history (last 5 releases)

### 2.3 — 2026-10-02

• A simpler start. Each sensor card now opens with one clear Connect Sensor
  button and a Try a Demo option, and always tells you its status in words —
  Not connected, Connecting, Connected or Demo.

• Two sensors, one step at a time. Connect your first sensor, then tap "Connect a
  second sensor" whenever you need it — no mode to set up front. The XY chart now
  reads "Y vs. X" like every other graph, and a new swap button exchanges the axes,
  including the data you have already collected.

• Quicker sample rate. Tap the rate to pick a common value from 1 to 100 Hz from a list, or enter
  your own with Custom.

• Clearer readings. Values show "—" until the first reading arrives, with the unit
  right beside the number. "Stable" is now "Average" (the last 40 samples).

• New ln|y| view. Pause any chart and tap ln|y| to plot the natural log of the
  data. Exponential decay and growth — a discharging capacitor, a cooling liquid,
  a damped oscillation — become straight lines, so a linear fit gives the rate
  straight from the slope. Tap again, or resume the chart, to return to the
  original values. Exported data is never changed.

• Photogate improvements. Block times and positions appear in a clearer table with
  larger numbers, and the Pendulum Period graph starts on a 1 ms scale so you can
  see the period change as the swing dies down.

### 2.2 — 2026-08-28

• Tone Generator — a built-in signal generator that needs no sensor. Play a pure sine tone at any frequency from 0.5 Hz to 20,000 Hz, run a frequency sweep (chirp) with an adjustable start, end, step size and step duration, or switch to Dual Tone to sound two independent tones at once — perfect for beats, musical intervals, superposition and masking demos. Set the amplitude and the output channel (both, left, or right) for each tone. Open it right from the dashboard.

• Charts tuned for Dark Mode. The full chart palette now brightens automatically in dark mode, so every trace and its points — force, motion, velocity, acceleration, magnetometer, temperature, and photogate graphs — stay vivid and easy to read on a dark background.

### 2.1 — 2026-08-16

New in NL Sensor 2.1:

• Photogate support with seven ready-made experiments: Basic Free Fall, Single
  Gate, Two-Gate Timer, Pendulum Period, Speed (two-stripe card), Pulley, and Two
  Gates. Get distance–time and speed–time graphs, oscillation periods with average
  and spread, angular motion from a pulley, and precise gate timing — linear-fit a
  speed–time graph to read acceleration off the slope.

• Dual Temperature probe support. See T₁ and T₂ together on one chart plus a
  separate chart for each, colour-coded red and green.

• Independent axis zoom. Pinch a paused chart horizontally to stretch time or
  vertically to stretch values — each axis zooms on its own.

• Clearer analysis. The "All Data" button is now labeled instead of a lookalike
  icon, and the statistics mean line and standard-deviation band are a bold orange
  that stands out from the data.

• Fixes. Long-named sensors (such as photogates) now reliably appear in the scan
  list, and a chart no longer stays frozen after Pause All followed by reconnect.

All measurements stay on your device. No account, no tracking.

### 2.0 — 2026-08-03

• Pressure & Temperature sensor support. When a pressure sensor connects, NL Sensor now shows a Temperature-vs-Time chart and a Pressure-vs-Temperature graph, with a fine ±0.1 hPa fixed scale for reading small changes.

• XY chart upgrades. Pause the XY chart to pan and pinch-zoom, drag-select a range for a least-squares linear fit (slope, intercept, R²) or statistics, and read any point with a tap. Points are now easier to see.

• Easier number entry. Numeric fields (sample rate, origin) now have a Done button above the keyboard, so the keypad no longer covers the screen.

• More reliable connections. Sensors with longer Bluetooth names are now found reliably during scanning.

• Smoother, steadier charts. Reduced flicker, calmer auto-scaling for near-constant signals, and performance improvements for long, high-rate recordings.

• The "Current" reading card is now labeled "Live" to avoid confusion with electric current.

All measurements stay on your device. No account, no tracking.

### 1.0 — 2026-07-28

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-09.*