Schematic for [Example] ESP32 Reference Design: An example...

Identifying SMD Component

irflashrex

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105 days

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2:01

General

Project

Knowledge Base

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Using Knowledge Base Tool.

That top mark “7002” on a 3‑pin SMD package is very likely a 2N7002 N‑channel MOSFET (SOT‑23), commonly used for small‑signal switching and level‑shifting.

How to verify quickly:

Gate will be the pin that’s isolated (very high resistance to the others).
In diode‑test mode you’ll read a body‑diode between the other two pins; the remaining pin is the gate. Typical pinout for 2N7002 is 1=Gate, 2=Source, 3=Drain (confirm with your board traces).

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list all ESP-01 pins in a table format. For each pin provide its pin number, pin...

irflashrex

@copilot list all ESP-01 pins in a table format. For each pin provide its pin number, pin name and function.

copilot

Here's a table listing the pins for the ESP-01 module, along with their pin numbers, names, and functions:

Table

Pin Number	Pin Name	Function
1	GND	Ground
2	IO2	GPIO2, U1_TXD, I2C_SDA, 12SO_WS
3	IO0	GPIO0, HSPI_MISO, I2SI_DATA
4	RXD	GPIO3, I2SO_DATA
5	TXD	GPIO1
6	EN	Chip Enabled Pin, Active High
7	RST	Reset Pin, Active Low
8	VCC	Supply Voltage

Would you like more details on any specific functionalities or application tips for these pins?

irflashrex

do i need pin 2 to be high in normal operation?

copilot

In normal operation, you typically want GPIO2 (Pin 2) on the ESP-01 module to be pulled high. This is generally important for successful booting when the ESP8266 is powered on or reset. Here are some details:

GPIO2: It should be connected to VCC (pulled high) for the ESP-01 to boot properly into the normal operating mode, also known as Flash mode.

Doing this ensures that the device doesn't enter a different boot mode, which could interfere with normal operations.

irflashrex

do i need pin 3 to be high in normal operation?

copilot

Yes, for normal operation of the ESP-01, you should also ensure that GPIO0 (Pin 3) is pulled high. Here’s why:

GPIO0: If GPIO0 is pulled high during power-up or reset, the ESP8266 boots into standard Flash mode, allowing the device to execute the firmware stored in its flash memory.

To enter the programming mode (to upload firmware), GPIO0 needs to be pulled low during reset. However, for regular operation, keeping it high ensures that the device boots correctly into normal operational mode.

irflashrex

is there any resistance needed for pins 2 or 3?

copilot

It's a good practice to use pull-up resistors to ensure that GPIO2 and GPIO0 are held high. A standard value for pull-up resistors in this context is typically around 10 kΩ. Here’s a bit more detail:

GPIO2 and GPIO0: Connect a 10 kΩ resistor between each GPIO pin and the VCC. This pull-up resistor helps maintain the pin in a high state and prevents it from floating, which might lead to unpredictable behavior.

These pull-up resistors are especially useful during power-up and reset to ensure reliable operation. Feel free to adjust the resistor values based on your specific design requirements, such as power consumption or signal integrity.

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3.3vdc

er-cd

reset

cd-dr

cs-rs

rst

Reviews

Electrical Rule Checks

Missing Footprints

Reports parts that have no footprint.

Design Rule Checks

Overlapping Copper • 16

Des	Net	Des	Net
rs232tx:rs232tx	Net 11	Via	None
Trace 2fc9	Net 11	Via	None
Trace a872	Net 11	Via	None
Trace 01fc	Net 12	Via	None
CD:CD	None	Trace a894	Net 13
Via	None	rs232rx:rs232rx	Net 12
Via	None	Trace a894	Net 13
Via	None	DR:DR	Net 14
Via	None	Trace 32c5	Net 14
Via	None	ER:ER	Net 15
Via	None	Trace f29e	Net 15
Via	None	CS:CS	Net 16
Via	None	Trace 9efe	Net 16
Via	None	Trace 847b	Net 16
Via	None	RS:RS	Net 17
Via	None	Trace 4662	Net 17

Invalid Layer

Reports nodes that are assigned to a layer that doesn't exist in the layout stackup.

Component Overrides • 3

	Designator	Ruleset
	Footprint	Override rule for Footprint
	＊｀VALUE｀＊	Override rule for ＊｀VALUE｀＊
	PCB Edge	Override rule for PCB Edge

Airwires

Reports missing routed traces between pads in a net.

Deprecated Rules

Reports nodes that are using rules that are not supported anymore.

Layers with Multiple Fills

Reports layers that have multiple copper fills of different nets. Make sure the Connected Layers rule value of nets with fills is valid.

Floating Copper

Detect any via, trace or copper fill island that is not connected to any net.

Protected Intrusions

Reports intrusions from objects of other nets into polygons or fills that have the Protected layout rule applied.

Manufacturing

Manufacturer Part Number • 3

	Designator	MPN
	C3	None
	R1	None
	R2	None

Parts Available

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Checks that all parts have a part number and are available from distributors.

System Checks

Auto-Layout

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Reports issues with Auto-Layout if Flux cannot route something or must ignore a configuration.

Passive Components

Resistor Power Rating

Beta

Checks that the power traveling across a given resistor is under its rating with 50% headroom.

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Pull Up/Pull Down Presence

Beta

Checks that IC pins that require pull up or pull down resistors have them.

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Capacitor Voltage Rating

Beta

Checks that capacitors have appropriate voltage ratings to prevent overheating and ensure reliable circuit operation.

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #generics
jharwinbarrozo
15.1k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

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[Example] ESP32 Reference Design

Controls

Properties

Availability & Pricing

Distributor		Qty 1
	Arrow	$1.59–$2.44
	Digi-Key	$2.31–$3.87
	LCSC	$2.28–$2.37
	Mouser	$2.56
	Verical	$0.79–$1.77

Assets

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esp32.png

id=esp32

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