Component Part Number Needed

Thought for 35 sec

Please provide the exact manufacturer part number for the component you want documented—for example, CP2102N-A02-GQFN24, ESP32-WROOM-32E, or the specific USB-C connector MPN.

The screen capture appears to show an ESP32 DevKit-style board, but it does not identify a unique component or ordering code, so I can’t produce a verified, datasheet-cited guide without risking incorrect pinout or rating information.

jharwinbarrozo

ESP32-DEVKIT-V1

Thought for 48 sec

flux

I’ll treat this as the common 30-pin DOIT-style ESP32-DEVKIT-V1 shown in the current footprint, verify the module/board limits and pin mapping from Espressif primary sources, then create the requested application guide as a project file.

Worked for 8 mins 17 sec

Created a project doc

ESP32-DEVKIT-V1 Application and Usage Guide

View Document

ESP32-DEVKIT-V1 Application and Usage Guide

The ESP32-DEVKIT-V1 is a family name commonly used for 30-pin development boards built around an ESP-WROOM-32/ESP32-WROOM-32-series module, a 3.3 V regulator, USB-to-UART bridge, reset/boot circuitry, and 2.54 mm headers. Its most common use is rapid Wi-Fi/Bluetooth prototyping with Arduino or ESP-IDF, but the name is not a single controlled manufacturer part number—regulator, USB bridge, connector, LED wiring, and even header orientation can vary between vendors.

Scope and verification note: This guide matches the 30-pin footprint used in this project: with the antenna end at the top and USB end at the bottom, the left header runs 3V3 through D23, and the right header runs VIN through EN. Module-level electrical claims are b...

flux

Created the ESP32-DEVKIT-V1 Application and Usage Guide, including the 30-pin pinout, electrical limits, application wiring, PCB guidance, alternatives, sourcing, and verified Espressif citations.

Open item

Exact VIN limits, dimensions, regulator capacity, and USB bridge depend on the specific clone/vendor revision.

Suggested next steps

Verify the project footprint against a physical board.
Audit the schematic connections for boot-strapping conflicts.
Create a firmware pin-mapping and bring-up guide.

Files

Pins

Symbol

Layout

3D View

ESP32-DEVKIT-V1 Application and Usage Guide

Scope and verification note: This guide matches the 30-pin footprint used in this project: with the antenna end at the top and USB end at the bottom, the left header runs 3V3 through D23, and the right header runs VIN through EN. Module-level electrical claims are based on Espressif ESP32-WROOM-32E documentation. Board-level limits that depend on the clone manufacturer are explicitly marked verify on the purchased board.

1. Quick Specifications

Table

Attribute	Rating / condition	Classification and engineering note
ESP32 module supply, VDD33	−0.3 to 3.6 V	Absolute maximum for ESP32-WROOM-32E; not an operating range.
ESP32 module storage temperature	−40 to +105 °C	Absolute maximum.
ESP32 module operating supply	3.0 to 3.6 V; 3.3 V typical	Recommended operating condition. Use regulated 3.3 V when bypassing the development-board regulator.
External 3.3 V supply capability	≥500 mA	Espressif recommendation; the module can draw a 379 mA Wi-Fi TX peak in the stated 802.11b test condition.
Operating ambient temperature	−40 to +85 °C for the 85 °C module version	Module rating only; the assembled clone board may use commercial-temperature regulator, USB bridge, connector, and passives.
GPIO logic	3.3 V domain	GPIOs are not 5 V tolerant: the documented high-level input maximum is VDD + 0.3 V. At 3.3 V, VIH is at least 0.75×VDD and VIL is at most 0.25×VDD.
GPIO output current	40 mA source typical under the datasheet test condition; 28 mA sink typical	These are characterization values, not a recommended continuous load. Use conservative GPIO currents and external drivers for LEDs, relays, motors, and other loads.
VIN / USB supply	5 V nominal	Board-dependent. Do not assume a safe high-voltage VIN range merely because some boards use an AMS1117-type regulator.
Header pitch	2.54 mm	Project footprint and common 30-pin-board convention.
Header row spacing	25.4 mm center-to-center	Project footprint; verify against a physical sample before manufacturing a mating PCB.
Approximate board envelope	About 28 mm × 51 mm	Common 30-pin format; not controlled by the ESP32-DEVKIT-V1 name. Measure the intended supplier’s board, USB overhang, button positions, and mounting holes.

2. Pinout & Connections

Orientation: antenna at the top, USB connector at the bottom. L1…L15 are the left-side pins from top to bottom; R1…R15 are the right-side pins from top to bottom. This position notation is safer than assigning global pin numbers because clone drawings number the two rows differently.

Table

Pin Number	Pin Name	Description	Best Practice
L1	3V3	Regulated 3.3 V rail	Use as a low-current output, or as a regulated input only when USB/VIN is disconnected. Never apply 5 V.
L2	GND	Ground	Connect to a solid common ground plane.
L3	GPIO15 / D15	GPIO, ADC2_CH3, touch, MTDO; strapping pin	Avoid forcing an incompatible level during reset; ADC2 is unavailable while Wi-Fi is enabled.
L4	GPIO2 / D2	GPIO, ADC2_CH2, touch; strapping pin	Do not let attached circuitry disturb its required boot level; onboard-LED wiring varies by clone.
L5	GPIO4 / D4	GPIO, ADC2_CH0, touch	General-purpose I/O; use level shifting for 5 V peripherals.
L6	GPIO16 / RX2	GPIO, commonly UART2 RX	Good general I/O/UART pin on WROOM boards; confirm module type if substituting a WROVER-based board.
L7	GPIO17 / TX2	GPIO, commonly UART2 TX	Good general I/O/UART pin on WROOM boards.
L8	GPIO5 / D5	GPIO, commonly VSPI CS; strapping pin	Keep external reset-time loading weak and deterministic.
L9	GPIO18 / D18	GPIO, commonly VSPI SCK	Preferred general SPI clock pin.
L10	GPIO19 / D19	GPIO, commonly VSPI MISO	Preferred general SPI input pin.
L11	GPIO21 / D21	GPIO, commonly I²C SDA	Add pull-up to 3.3 V, normally 2.2–10 kΩ depending on bus capacitance and speed.
L12	GPIO3 / RX0	UART0 RX, connected to USB-UART bridge	Avoid hard-driving this pin during programming; isolate external UART sources if contention is possible.
L13	GPIO1 / TX0	UART0 TX, connected to USB-UART bridge	Boot logs and programming traffic appear here; do not use for a load that reacts badly to startup transitions.
L14	GPIO22 / D22	GPIO, commonly I²C SCL	Add pull-up to 3.3 V; route with SDA over a continuous ground reference.
L15	GPIO23 / D23	GPIO, commonly VSPI MOSI	Preferred general SPI output pin.
R1	VIN	Nominal 5 V board rail / regulator input	Supply 5 V nominal only; verify reverse-current behavior before treating VIN as an output while USB is connected.
R2	GND	Ground	Connect to the same ground as the external supply and peripherals.
R3	GPIO13 / D13	GPIO, ADC2_CH4, touch, MTCK	General-purpose I/O; ADC2 unavailable during Wi-Fi operation.
R4	GPIO12 / D12	GPIO, ADC2_CH5, touch, MTDI; strapping pin	High-risk boot pin: external pull-ups can select an incompatible flash voltage. Prefer another pin when possible.
R5	GPIO14 / D14	GPIO, ADC2_CH6, touch, MTMS	Common HSPI clock; attached loads must tolerate startup transitions.
R6	GPIO27 / D27	GPIO, ADC2_CH7, touch	General-purpose digital/touch pin.
R7	GPIO26 / D26	GPIO, ADC2_CH9, DAC2	Use for DAC output or digital I/O; buffer analog loads.
R8	GPIO25 / D25	GPIO, ADC2_CH8, DAC1	Use for DAC output or digital I/O; buffer analog loads.
R9	GPIO33 / D33	GPIO, ADC1_CH5, touch	Good analog input when Wi-Fi must remain active.
R10	GPIO32 / D32	GPIO, ADC1_CH4, touch	Good analog input when Wi-Fi must remain active.
R11	GPIO35 / D35	ADC1_CH7, input only	No output driver; add an external bias resistor whenever a defined idle state is required.
R12	GPIO34 / D34	ADC1_CH6, input only	No output driver; suitable for analog sensing with appropriate source impedance and external biasing.
R13	GPIO36 / VP	ADC1_CH0, input only	Analog/input use only; add external biasing as needed.
R14	GPIO39 / VN	ADC1_CH3, input only	Analog/input use only; add external biasing as needed.
R15	EN	Active-low chip enable/reset	Normally leave to the onboard reset network. External reset may pull EN low with an open-drain device; Espressif recommends a 10 kΩ/1 µF CHIP_PU RC network in a bare-module design.

GPIO0 is used by the onboard BOOT circuit but is not exposed on this project’s 30-pin footprint. Espressif identifies GPIO0, GPIO2, GPIO5, MTDI, and MTDO as strapping pins and recommends a pull-up on GPIO0.

3. Standard Application Circuit

Basic powered sensor/controller setup

Power the board from one source only: USB, 5 V/VIN plus GND, or a regulated 3.3 V source plus GND. Espressif’s analogous DevKitC documentation explicitly makes these options mutually exclusive because combining them can damage the board or source.
For an external 5 V supply, use a low-noise source with at least 500 mA available for the ESP32 board alone; increase the budget for attached peripherals. Add local bulk capacitance near the board connector when supply leads are long. Espressif recommends at least 10 µF at the main power entrance in a module-based design.
Connect all peripheral grounds to board GND. Power 3.3 V sensors from 3V3 only if the onboard regulator’s thermal and current margin is known; otherwise use a separate regulator and common ground.
For I²C, connect GPIO21=SDA and GPIO22=SCL, with pull-ups to 3.3 V, not 5 V.
For SPI, a common mapping is GPIO18=SCK, GPIO19=MISO, GPIO23=MOSI, and GPIO5=CS. Account for GPIO5’s strapping behavior at reset.
For analog measurements during Wi-Fi operation, select ADC1 pins such as GPIO32, GPIO33, GPIO34, GPIO35, GPIO36, or GPIO39. ADC2 cannot be used while Wi-Fi is enabled.

Programming and reset

Use the board’s USB-UART connection for flashing and logs. GPIO1 and GPIO3 are UART0 TX/RX and are shared with that bridge.
Automatic programming normally drives EN and GPIO0. If automatic entry fails, hold BOOT, press/release EN, then release BOOT; Espressif documents holding Boot and pressing EN to initiate serial firmware-download mode.
Do not place low-impedance loads on UART0 or strapping pins unless their startup state is fully controlled.

Driving loads

GPIO characterization reaches 40 mA source and 28 mA sink under specific test conditions, but this is not a recommended load design point. Use a transistor or MOSFET plus appropriate flyback protection for relays, motors, solenoids, buzzers, high-brightness LEDs, and other significant loads.

For a simple indicator LED, use:

R = (3.3 V − VF) / ILED

Example: for a red LED with VF ≈ 2.0 V at ILED = 5 mA, select about 260 Ω; use the next standard value, 270 Ω. Do not connect a 5 V logic output directly to any ESP32 GPIO.

4. PCB Layout & Routing Guidelines

Place the development board so the ESP32 module’s PCB antenna extends beyond the carrier-board edge where possible. If it cannot, remove carrier-board material/copper beneath and beside the antenna region; Espressif recommends at least 15 mm clearance in all directions inside the enclosure.
Keep copper pours, traces, batteries, displays, cables, metal fasteners, and enclosure metal away from the antenna end. Do not place a ground plane directly beneath the antenna.
Route 5 V, 3.3 V, and GND with low impedance. Size power traces for the board plus peripheral current, and place bulk capacitance near the board power-entry pins.
Maintain a continuous ground reference under SPI, I²C, and UART routing. Keep noisy switching nodes, motors, and DC/DC inductors away from analog inputs and the antenna.
If embedding the bare ESP32 module rather than the complete DevKit, place decoupling capacitors close to each power pin and put a ground via close to each capacitor ground pad for a short return path.

5. Common Pitfalls / Things to Watch Out For

Assuming every ESP32-DEVKIT-V1 is identical. Boards sold under this name use different USB bridges, regulators, connectors, LEDs, dimensions, and protection circuitry. Verify the exact supplier sample before committing a mating PCB, enclosure, production test fixture, or VIN rating.
Ignoring startup and peripheral restrictions. GPIO12, GPIO15, GPIO2, and GPIO5 participate in boot strapping; GPIO34/35/36/39 are input-only; GPIO1/3 are shared with USB-UART; and ADC2 channels are unavailable when Wi-Fi is enabled. These errors commonly cause boot loops, failed uploads, or intermittent analog readings.

Also avoid the ESP32 module’s internal flash pins GPIO6–GPIO11. Espressif states these signals are internally used for SPI flash and using them can disrupt flash/PSRAM access.

6. Popular Alternatives & Equivalents

There is no manufacturer-verified universal drop-in replacement for a generic 30-pin ESP32-DEVKIT-V1 because the name does not define a controlled mechanical or electrical specification.

Table

Alternative	Compatibility	Use case
Espressif ESP32-DevKitC V4 / ESP32-DevKitC-32E	Functionally similar; not footprint- or pin-compatible with this 30-pin carrier	Preferred when traceable Espressif documentation, a controlled MPN, and authorized distribution matter.
Ai-Thinker NodeMCU-32S	Functionally similar; not footprint-compatible and pin-header mapping differs	ESP32/Wi-Fi/Bluetooth prototyping where the wider NodeMCU form factor is acceptable.
Adafruit HUZZAH32 Feather (PID 3405/3591)	Functionally similar; not pin- or footprint-compatible	Adds the Feather ecosystem and LiPo charging, with a documented supplier-controlled board.

A vendor’s “30-pin ESP32 DevKit V1” may be mechanically interchangeable, but treat it as unverified until its header order, row spacing, board outline, USB overhang, mounting holes, regulator, and VIN behavior have been checked.

7. Sourcing & Purchasing Guide

Table

Attribute	Details
Primary Distributors	For traceable alternatives and ESP32 modules: DigiKey, Mouser, Arrow, Farnell/Newark, RS, and authorized Espressif distributors. Generic DEVKIT-V1 clones are also sold by LCSC and maker retailers, but vendor identity and revision control may vary.
Packaging Options	Development boards are usually sold individually or in bulk trays/bags; they are generally not tape-and-reel components. Bare ESP32-WROOM modules are available in cut tape and tape-and-reel.
Standard MOQ	Commonly 1 board for retail development kits. Bulk-board MOQ and packaging are supplier-specific. Module cut-tape MOQ is commonly 1; full-reel quantity depends on the exact module ordering code.
Sourcing Advice	For production, prefer a controlled MPN such as an Espressif DevKit or design the ESP32-WROOM module directly onto the product PCB. Buy through franchised distributors, match the complete ordering suffix for module type, antenna, flash/PSRAM, temperature grade, and packaging, and qualify any second source mechanically and electrically. Counterfeit or re-marked modules and inconsistent clone revisions are a material risk on non-authorized marketplaces.

Sources

Espressif Systems, ESP32-WROOM-32E & ESP32-WROOM-32UE Datasheet, v2.1, dated 2026-08-05; available from the Espressif module documentation page.
Espressif Systems, ESP32-DevKitC V4 User Guide, current online release; official user guide.
Espressif Systems, ESP Hardware Design Guidelines — ESP32, current online release; official hardware design guidelines.
Ai-Thinker, NodeMCU-32S Product Specification; official board documentation.
Adafruit Industries, HUZZAH32 ESP32 Feather; official product page.

Board Qualification Checklist

Before using a purchased ESP32-DEVKIT-V1 as a production subassembly, record the supplier, board revision, ESP32 module marking, USB-UART IC, regulator MPN, connector type, board dimensions, header spacing, VIN behavior, maximum stable peripheral current from 3V3, and programming/reset behavior. Retain a golden sample because the generic product name alone does not ensure future lots are equivalent.

1. Quick Specifications
2. Pinout & Connections
3. Standard Application Circuit
Basic powered sensor/controller setup
Programming and reset
Driving loads
4. PCB Layout & Routing Guidelines
5. Common Pitfalls / Things to Watch Out For
6. Popular Alternatives & Equivalents
7. Sourcing & Purchasing Guide
Sources
Board Qualification Checklist