EMF Meter - Complete Shopping List

What You're Building

✓ Electromagnetic field detector with 5-LED bar graph

✓ OLED display showing numerical readings

✓ Rechargeable 18650 battery powered

✓ Portable handheld device in enclosure

Total Cost: $40-55 | Build Time: 3-4 hours | Difficulty: ⭐⭐ Easy-Medium

💰 Save $40-60 vs K-II EMF Meter ($50-100)

🔧 Core Components (Required)

1×

ESP32 Development Board (3-pack)

Main microcontroller. Get 3-pack for future projects. WROOM-32 chip, 38-pin version.

$15-18

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1×

0.96" OLED Display (I2C)

128x64 resolution, SSD1306 chip, I2C interface (4-pin). Blue or white display.

$7-10

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1×

Hall Effect Sensor Module (A3144)

Digital hall sensor on breakout board. Get 5-10 pack. This detects magnetic fields (EMF).

$6-8

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5×

LED Assortment Kit

5mm LEDs in multiple colors. For EMF you need: 1 clear, 1 blue, 1 green, 1 yellow, 1 red. Get 500-1000 piece assortment for all future projects.

$8-12

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5×

Resistor Kit (1000 pieces)

1/4W resistor assortment. Need 220Ω for LEDs. Kit has all values for future projects.

$10-14

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1×

Terminal Block Strip (12-position dual row)

Screw terminals for wire connections. More compact than breadboard - fits in small 100×60×25mm enclosure. Requires small screwdriver.

$3-5

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1×

Solid Core Wire Kit (22 AWG)

Pre-cut solid core wires in multiple colors. For terminal block connections. Get assorted length kit.

$8-12

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🔋 Power System (Required)

2×

18650 Rechargeable Battery (2-pack)

3.7V lithium-ion batteries, 3000mAh+. Get protected cells with button top. Only need 1 for EMF meter.

$10-15

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1×

18650 Battery Holder (Single)

Plastic holder with wires. Spring-loaded. Single cell holder for compact build.

$5-7

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1×

TP4056 Charging Module (5-pack)

USB battery charger with protection. Charge battery without removing from device.

$6-9

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1×

Micro-USB Extension Cable (3-4 inch, 5-10 pack)

Short male-to-female extension for ESP32 firmware updates. Stays inside case permanently. Buy multi-pack for best value ($0.50-1 each).

$5-10

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1×

SPDT Slide Switch (10-pack)

On/off power switch. Small slide switch, panel mount. Get pack for future projects.

$5-7

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📦 Enclosure & Assembly (Required)

1×

Project Box / Enclosure

ABS plastic box, approx 4" × 3" × 1.5" (100×75×40mm). Black or gray. Need to drill holes.

$7-12

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1×

Hot Glue Gun + Glue Sticks

For mounting components inside enclosure. Mini glue gun works fine.

$6-10

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1×

Double-Sided Foam Tape

3M VHB or similar. For mounting boards inside case. Strong adhesive.

$5-8

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1×

USB Cable (Micro-USB or USB-C)

To program ESP32 from computer. Check your ESP32 board's USB port type. 3-6 foot length.

$4-6

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🔨 Tools (Recommended)

1×

Drill Bit Set + Hand Drill

Need 3mm, 5mm, 6mm bits minimum. For drilling holes in enclosure. Cordless drill recommended.

$15-25

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1×

Automatic Center Punch

CRITICAL for accurate drilling! Creates starter dimple so drill doesn't wander. Game changer.

$6-10

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1×

Step Drill Bit

Optional but HIGHLY recommended. Makes clean holes in plastic. One bit does multiple sizes.

$8-15

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🔌 Power Filtering (REQUIRED)

1×

Ceramic Capacitor Kit (500 pieces) - 0.1µF

ESSENTIAL power filtering capacitors. Prevents voltage noise, random resets, and jumpy readings. Need 3× per EMF meter. Get bulk kit for all projects.

$10-14

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⭐ Optional Upgrades

1×

Perfboard / Protoboard Kit

For permanent soldered builds. Transfer from breadboard when everything works.

$8-12

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1×

Soldering Iron Kit

For permanent builds on perfboard. Temperature controlled, 60W. Includes solder and tips.

$18-25

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💡 Pro Tips:
• Buy 3-packs of ESP32 boards - same price per unit, have spares for future projects
• LED and resistor kits provide components for ALL OpenParanormal devices
• Breadboard is ESSENTIAL for testing before permanent assembly
• Hot glue gun is used in every build - great investment
• Amazon's "Frequently bought together" feature can save money

📡 EMF Meter - Complete Shopping List

What You're Building

🔧 Core Components (Required)

🔋 Power System (Required)

📦 Enclosure & Assembly (Required)

🔨 Tools (Recommended)

🔌 Power Filtering (REQUIRED)

⭐ Optional Upgrades