Voltmeter Clock - Quick Operation Guide

Quick Start

Power On

1. Connect power to Arduino
2. Wait for sensors to initialize (~2 seconds)
3. Device starts in Time Mode by default

Normal Operation

Viewing Time (Default Mode)

• Three voltmeters display:
  • Left: Hours (0-12, 12-hour format)
  • Middle: Minutes (0-60)
  • Right: Seconds (0-60)
• LEDs: Hour, Minute, Second LEDs are ON (solid)
• Behavior: Second hand moves smoothly with quarter-second interpolation

Viewing Environmental Data (PTH Mode)

1. Press button briefly (< 0.5 seconds)
2. Voltmeters switch to display:
   • Left: Pressure (950-1030 hPa)
   • Middle: Temperature (40-100°F)
   • Right: Humidity (0-100% RH)
3. LED: PTH LED turns ON
4. Return to time: Press button again briefly

Time Adjustment Procedure

Entering Adjustment Mode

1. Hold button for more than 0.5 seconds (long press)
2. Device enters adjustment mode
3. Hour LED starts blinking

Adjusting Hours

1. Rotate encoder clockwise/counter-clockwise
2. Left voltmeter shows current hour value (0-11)
3. Hour LED blinks to indicate active adjustment
4. Press button to confirm and move to minutes

Adjusting Minutes

1. Rotate encoder to set minutes (0-59)
2. Middle voltmeter shows current minute value
3. Minute LED blinks to indicate active adjustment
4. Press button to confirm and move to seconds

Adjusting Seconds

1. Rotate encoder to set seconds (0-59)
2. Right voltmeter shows current second value
3. Second LED blinks to indicate active adjustment
4. Press button to finish adjustment
5. Device exits adjustment mode and enters PTH mode
6. Press button briefly to return to time mode

Visual Indicators

LED Status Meanings

Voltmeter Behavior

Time Mode

• Smooth continuous movement of all three hands
• Second hand has quarter-second interpolation for fluid motion
• Hour hand includes fractional hours based on minutes
• Minute hand includes fractional minutes based on seconds

PTH Mode

• Real-time updates of environmental data
• Pressure: Higher pressure = higher voltage (right side of scale)
• Temperature: Higher temperature = higher voltage (right side of scale)
• Humidity: Higher humidity = higher voltage (right side of scale)

Adjustment Mode

• Only the active voltmeter shows the adjustment value
• Other voltmeters are at zero
• Value updates as you rotate the encoder

Button Functions

Rotary Encoder Functions

Typical Usage Scenarios

Scenario 1: Daily Time Display

1. Power on device
2. Device automatically shows time
3. No interaction needed
4. Watch the smooth analog movement

Scenario 2: Check Weather Conditions

1. Press button briefly
2. Observe PTH readings on voltmeters
3. Press button again to return to time

Scenario 3: Set Time After Power Loss

1. Long press button to enter adjustment
2. Set hours using encoder, press button
3. Set minutes using encoder, press button
4. Set seconds using encoder, press button
5. Press button to finish
6. Press button briefly to return to time mode

Scenario 4: Quick Time Check

• Just look at the voltmeters - no button press needed
• LEDs indicate you’re in time mode

Troubleshooting Quick Reference

Tips for Best Experience

1. Calibration: Ensure voltmeters are properly calibrated for accurate readings
2. Lighting: Position LEDs where they’re visible but not distracting
3. Placement: Keep sensors away from heat sources for accurate readings
4. Power: Use stable power supply for consistent voltmeter readings
5. Serial Monitor: Enable debug mode to see sensor readings and system status

Mode Summary

┌─────────────────────────────────────────┐
│  TIME MODE (Default)                    │
│  - Voltmeters: Hours, Minutes, Seconds  │
│  - LEDs: Hour, Min, Sec ON              │
│  - Action: Short press → PTH Mode       │
└─────────────────────────────────────────┘
              ↓ (Short Press)
┌─────────────────────────────────────────┐
│  PTH MODE                                │
│  - Voltmeters: Pressure, Temp, Humidity │
│  - LED: PTH ON                           │
│  - Action: Short press → Time Mode      │
└─────────────────────────────────────────┘
              ↓ (Long Press)
┌─────────────────────────────────────────┐
│  ADJUSTMENT MODE                        │
│  - Step 0: Adjust Hours (LED blinks)    │
│  - Step 1: Adjust Minutes (LED blinks)  │
│  - Step 2: Adjust Seconds (LED blinks)   │
│  - Action: Press to confirm each step   │
└─────────────────────────────────────────┘

Quick Command Reference