Breadboard Schematic for Electromagnetic Visualizer

ezexa

The exported PDF is wrong because it shows PCB layers/footprints/copper instead of a readable schematic.

Please convert this project into a clean documentation schematic only.

Requirements:

Do NOT create PCB layout.
Do NOT show PCB footprints.
Do NOT show copper layers.
Do NOT show pads only.
Use schematic symbols, not footprint symbols.
Draw visible schematic wires.
Keep this as a breadboard prototype documentation schematic.

Create a clean one-page schematic with these blocks from left to right:

Power rails
BC547 LC oscillator
LM339 comparator
ESP32 + OLED + calibration button

Use visible wires and net labels.

Main signal path: +5V → L1 → OUT_OSC OUT_OSC → BC547 collector OUT_OSC → C1 47nF → EMIT EMIT → C2 47nF → GND EMIT → RE 1k → GND BASE biased by R1 47k to +5V and R2 20k to GND OUT_OSC → C3 10nF → SIG_IN SIG_IN → LM339 pin 5 VREF → LM339 pin 4 LM339 pin 2 → COMP_OUT R6 4.7k from +3V3 to COMP_OUT COMP_OUT → R7 1k → ESP32 GPIO27 OLED VCC → +3V3 OLED GND → GND OLED SDA → ESP32 GPIO21 OLED SCL → ESP32 GPIO22 SW1 from ESP32 GPIO14 to GND

Power: ESP32 5V → +5V ESP32 3V3 → +3V3 ESP32 GND → GND LM339 pin 3 → +5V LM339 pin 12 → GND All grounds common.

Important:

LM339 output pull-up R6 must connect to +3V3, not +5V.
ESP32 GPIO is not 5V tolerant.
ESP32 must not connect directly to OUT_OSC.
U1:VP is intentionally unused and should remain No Connect.

After revising, make the schematic fit on one readable page for screenshot or print-to-PDF.

Thought for 6 sec

flux

I’ll revise the project into a clean one-page documentation schematic only: schematic symbols, visible wiring/net labels, left-to-right functional blocks, and no PCB layout work.

Worked for 4 mins 22 sec

flux

Created a clean one-page breadboard documentation schematic with schematic symbols, visible wires, and net labels — no PCB layers, copper, footprints, or pads-only view.

Files:

Image
Clean schematic SVG
Printable schematic HTML — open this and use browser Print → Save as PDF.

I also added Breadboard Assembly Schematic to the project files documenting that this schematic-only output is the correct assembly reference. The live netlist was rechecked; the only remaining ERC issue is the intentional U1:VP No Connect, as requested.

Export PDF version

Check schematic accuracy

Create assembly guide

Generate BOM list

Add firmware starter

U1 GND_3 - R2 P2

L1 P2 - Q1 C

Q1 E - RE P1

Q1 B - R1 P2

L1 P2 - Q1 C

C3 P2 - R5 P1

U1 5V - L1 P1

Resistance

47 kΩ

Q1 E - RE P1

Resistance

20 kΩ

Capacitance

47 nF

Capacitance

10 nF

Inductance

Handmade / tune empirically H

Capacitance

47 nF

Reviews

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Project Name

Spatial Metal Field Display Mini

Description

Breadboard-only schematic for an ESP32-based LC electromagnetic response visualizer using a handmade coil oscillator, LM339 comparator, GPIO27 frequency input, SSD1306 I2C OLED, and calibration button. No PCB layout is included.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$0.21–$0.34
Digi-Key	$11.10–$11.38
HQonline	$0.33
LCSC	$12.72–$12.99
Mouser	$0.63
TME	$0.00
Verical	$0.15–$0.37

Controls

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