📁 Lab files (download)
Lab0_7.xlsx, Lab1_7.docx).🔌 IOLab setup (web version — no install)
- Put 2× AA batteries in the IOLab and turn it on.
- Plug the USB dongle into the laptop.
- Open Chrome → iolab.science/iolabweb (works without installing anything).
- Click Connect → when the browser asks, select the dongle and Allow.
- Not found? Turn the device OFF, hold + while turning it back ON (Discovery Mode) → Pair.
- Test: Record → wiggle it → if the graph moves, you're connected. ✅
❤️ The 5 heart-rate graphs (3 methods + resting/active)
Method 2 · Pulse Oximeter (Light sensor) — ⭐ start here, easiest
Dropdown: 40: Light(4800) or 6: Light(400) → Configure → Record. Shine your phone flashlight into the pad of a finger and press that finger against the light sensor. Zoom + smooth. Each dip = a beat.
Method 1 · ECG (electrical / high-gain) — the penny trick
Dropdown: 48: ECG(400) or the HG combo → Configure → Record → Smoothing = 25. Wire #1 → G+ terminal, wire #2 → G− terminal; alligator clip on each free end; clip each to a penny (dab hand sanitizer for contact); hold one penny in each hand, very still. Sharp spikes = beats.
Method 3 · Accelerometer (motion)
Dropdown: 33: Accel(800) or 2: Accel(400) → Configure → Record. No wires — rest the IOLab flat on your chest, lie very still, apply heavy smoothing. Small bumps = beats.
Graphs 4 & 5 · Resting vs Active
Use the light sensor both times. Record resting (sitting calm), then do ~30 s jumping jacks and immediately record active — beats will be spaced closer together (faster).
How to smooth noisy data
📊 Lab 0 — Intro to Excel (reference)
Data: Distance/Time of a moving cart. Speed = d/t. Scatter (Time = x, Distance = y), linear trendline.
Key results (to check your own work)
- Speeds: 0.52, 0.79, 0.97, 1.00, 1.10 m/s
- Mean speed 0.88 · Sample SD (STDEV.S) 0.23
- Toy-car times mean 4.90 s · Population SD (STDEV.P) 0.14 s (= error bar value)
- Trendline y = 1.51x − 2.03 · R² ≈ 0.997
- Predict at 6.0 s → ≈ 7.03 m
Wrap-up answers A–I
- A Speed is a calculated quantity (from measured d & t) — keep measured vs calculated separate.
- B Slope = speed/velocity (rate of change of distance with time).
- C y-intercept = distance at t=0 (initial position); slightly negative = small offset.
- D R² near 1 = strong linear fit (variables highly correlated).
- E Graph Y (professional: title, labeled axes w/ units, trendline, equation, R²).
- F y = 1.51(6.0) − 2.03 ≈ 7.03 m.
- G The (3.5 s, 3.4 m) point is farthest — random measurement error.
- H Error bars ±0.14 s ≈ 3% of 4.90 s → fairly precise.
- I (1.10 − 0.88)/0.23 ≈ 1.0 standard deviation.
✅ Quiz answers
Pre-lab 0.1 (IOLab + Excel videos)
- iOLab purpose → collect & send data to a computer for real-time analysis
- iOLab lets students → explore experiments independently & understand science broadly
- Scatter plot → highlight data → Insert → Scatter Plot
- Label axes → ensures accurate data interpretation
- Excel version → Windows desktop version
- Professional graph → titles for graph & axes
- Trendline purpose → identify/describe the relationship between variables
Lab 1 pre-lab video quiz
- Heart contracts all at once → False (coordinated sequence: atria then ventricles)
- Camera detects heart rate → by tiny color changes in the skin over time
- Accelerometer chip replaces ball-and-spring with → a comb-like silicon structure with flexible supports
- Smartphone accelerometer main function → detect orientation and motion
- Large error bars indicate → high uncertainty
Lab 0 post-lab assessment
- Slope of trendline → relationship between distance and time (= speed)
- Copy formula down → drag the fill handle (bottom-right square)
- Objective of Excel lab → input, organize, analyze, visualize experimental data
- Independent variable axis → the x-axis
- Average function → =AVERAGE
📦 PHYS 1164 take-home kit (provided — return at end)
You don't buy these; you're accountable for returning them. For Lab 1 you only need the IOLab, dongle, 2× AA, your phone, and — from the kit — 2 male-to-male wires + alligator clips (ECG method).
| Item | Qty | Used for |
|---|---|---|
| Alligator clips | 5 | ECG leads (clip to pennies) |
| Male-to-male wires | 2 | ECG → G+/G− terminals |
| Breadboard + resistors (100/1k/10k Ω) | — | Ohm's law / RC circuits (later) |
| Diode | 1 | Circuits (later) |
| Capacitors (22 µF, 220 µF) | 2 | RC circuits (later) |
| Hanging magnet + copper wire | — | Induction / magnetism (later) |
| Polarizer film ×2, ruler, protractor | — | Optics (later) |
| Balloons ×3 | 3 | Electrostatics (later) |
| 4× AA + battery holder | — | Circuit power (later) |