Connected IoT devices and wireless sensor nodes
On-board radio: Wi-Fi 802.11 b/g/n 2.4 GHz.
Engineering inference
NodeMCU (open hardware; generic makers)
NodeMCU V1.0 ESP8266 (ESP-12E) Board
NodeMCU DEVKIT V1.0 is the open-hardware ESP8266 board: an ESP-12E module (ESP8266EX, 80/160 MHz, 4 MB flash, 802.11 b/g/n) with a CP2102 USB-serial on micro-USB. It has 30 pins on two 1×15 headers 0.9 in apart: D0–D8, RX/TX, A0 and SD0–SD3. There are FLASH and RST buttons, a blue LED on D0 / GPIO16 and 3.3 V logic. The board is 25.4 × 48.3 mm with four Ø2.9 mm holes and costs about .
NodeMCU DEVKIT V1.0Development boardPrice$6.95protosupplies.com · in stock
Buy at protosupplies.com Overview
Board essentials
Facts about the complete product. Unknown values remain open design questions.
- Exposed GPIO
- 11
- Board I/O voltage
- 3.3 V
- Board flash capacity
- 4 MiB
- Board SRAM capacity
- 96 KiB
A good fit for
Guidance to help you shortlist. The basis is shown for each recommendation.
Learning and fast prototyping
Programs from Arduino IDE, NodeMCU Lua firmware.
Engineering inferenceInside this board
The board is the parent product. Each chip has its own memory, pins, capabilities and thermal limits.
main processor
ESP8266EX
Espressif Systems
1956154e-b234-5b7f-ada0-dd840ece9977--mcu- Architecture
- Tensilica L106 32-bit RISC
- Documented clock
- 160 MHz
- On-chip SRAM
- 50 KiB
usb uart
CP2102
Silicon Labs
1956154e-b234-5b7f-ada0-dd840ece9977--u23D model & CAD
3D model & CAD files
Generated from the datasheet's dimensioned drawing and measured against it. Download the STEP to check fit in your own enclosure.
- Envelope (L × W × H)
- 48.26 × 25.4 × 1.6 mm
- Verification
- generated
- Envelope complete
- No — some heights assumed
thickness=1.6 mm assumed: PCB thickness not in the Gerber or BOM; 1.6 mm assumed for the CAD envelope only
Pins & mapping
30 board pins and 20 explicit routes documented. The record marks the pinout complete. Alternate functions can share pins and may not be usable together.
Exposed board pins
Board connector positions are the physical points you wire to.
| Board pin | Connector / position | Electrical | Functions / constraints |
|---|---|---|---|
| A0ID L1 | J1 (A0 side)Position L1 | analog | A0 (10-bit, 0–3.3 V per Components101) ADC0 / TOUT |
| RSVID L2 | J1 (A0 side)Position L2 | other | rsv reserved |
| RSVID L3 | J1 (A0 side)Position L3 | other | rsv reserved |
| SD3ID L4 | J1 (A0 side)Position L4 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | SDIO_DATA_3, SPIWP (flash) GPIO10, SDD3 (flash) |
| SD2ID L5 | J1 (A0 side)Position L5 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | SDIO_DATA_2, SPIHD (flash) GPIO9, SDD2 (flash) |
| SD1ID L6 | J1 (A0 side)Position L6 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | SDIO_DATA1, SPID/MOSI (flash), U1RXD MOSI, SDD1 (flash) |
| CMDID L7 | J1 (A0 side)Position L7 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | SDIO_CMD, SPICS0 (flash) CS, SDCMD (flash) |
| SD0ID L8 | J1 (A0 side)Position L8 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | SDIO_DATA0, SPIQ/MISO (flash) MISO, SDD0 (flash) |
| CLKID L9 | J1 (A0 side)Position L9 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | SDIO_CLK, SPICLK (flash) SCLK, SDCLK (flash) |
| GNDID L10 | J1 (A0 side)Position L10 | 0 Vground | ground ground |
| 3V3ID L11 | J1 (A0 side)Position L11 | power out | power_out 3.3 V |
| ENID L12 | J1 (A0 side)Position L12 | control | en chip enable |
| RSTID L13 | J1 (A0 side)Position L13 | control | rst reset |
| GNDID L14 | J1 (A0 side)Position L14 | 0 Vground | ground ground |
| VinID L15 | J1 (A0 side)Position L15 | power in | power_in VIN 5 V |
| D0ID R1 | J2 (D0 side)Position R1 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | blue onboard LED (LED_BUILTIN), Deep-sleep wakeup (connect to EXT_RSTB) GPIO16, USER LED, WAKE |
| D1ID R2 | J2 (D0 side)Position R2 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | IR Rx GPIO5 |
| D2ID R3 | J2 (D0 side)Position R3 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | PWM3 GPIO4 |
| D3ID R4 | J2 (D0 side)Position R4 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | FLASH button, SPICS2 GPIO0, FLASH button |
| D4ID R5 | J2 (D0 side)Position R5 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | I2C_SDA (software I2C), U1TXD, I2SO_WS GPIO2, TXD1 |
| 3V3ID R6 | J2 (D0 side)Position R6 | power out | power_out 3.3 V |
| GNDID R7 | J2 (D0 side)Position R7 | 0 Vground | ground ground |
| D5ID R8 | J2 (D0 side)Position R8 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | HSPICLK, I2C_SCL (software I2C), I2SI_WS, PWM2, IR TX GPIO14, HSCLK |
| D6ID R9 | J2 (D0 side)Position R9 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | HSPIQ/MISO, I2SI_DATA, PWM0 GPIO12, HMISO |
| D7ID R10 | J2 (D0 side)Position R10 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | HSPID/MOSI, U0CTS, I2SI_BCK GPIO13, RXD2, HMOSI |
| D8ID R11 | J2 (D0 side)Position R11 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | HSPICS, U0RTS, I2SO_BCK, PWM1 GPIO15, TXD2, HCS |
| RXID R12 | J2 (D0 side)Position R12 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | U0RXD, I2SO_DATA D9: GPIO3, RXD0 |
| TXID R13 | J2 (D0 side)Position R13 | 3.3 Vgpio5 V tolerant: noMax drive 12 mA | U0TXD, SPICS1 D10: GPIO1, TXD0 |
| GNDID R14 | J2 (D0 side)Position R14 | 0 Vground | ground ground |
| 3V3ID R15 | J2 (D0 side)Position R15 | power out | power_out 3.3 V |
Board → chip mapping
A board label, a chip signal ID and a package lead number are different identifiers.
| Board connection | Chip instance | Chip signal | Package lead | Route |
|---|---|---|---|---|
L1 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | TOUTID TOUT | — | other scaled on board |
L4 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO10ID GPIO10 | — | direct |
L5 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO9ID GPIO9 | — | direct |
L6 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO8ID GPIO8 | — | direct |
L7 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO11ID GPIO11 | — | direct |
L8 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO7ID GPIO7 | — | direct |
L9 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO6ID GPIO6 | — | direct |
L12 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | CHIP_ENID CHIP_EN | — | direct |
L13 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | EXT_RSTBID EXT_RSTB | — | direct |
R1 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO16ID GPIO16 | — | direct |
R2 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO5ID GPIO5 | — | direct |
R3 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO4ID GPIO4 | — | direct |
R4 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO0ID GPIO0 | — | direct |
R5 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO2ID GPIO2 | — | direct |
R8 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO14ID GPIO14 | — | direct |
R9 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO12ID GPIO12 | — | direct |
R10 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO13ID GPIO13 | — | direct |
R11 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO15ID GPIO15 | — | direct |
R12 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO3ID GPIO3 | — | direct |
R13 | ESP8266EXInstance 1956154e-b234-5b7f-ada0-dd840ece9977--mcu | GPIO1ID GPIO1 | — | direct |
ESP8266EX · chip pins
Chip signals stay attached to their chip instance, including their package lead and board exposure.
Chip package pins have not been transcribed for this instance.
CP2102 · chip pins
Chip signals stay attached to their chip instance, including their package lead and board exposure.
Chip package pins have not been transcribed for this instance.
Specifications
Board electrical limits
Supply voltage and GPIO logic voltage describe different parts of the design.
- I/O voltage
- 3.3 V
- Supply voltage range
- 7 to 12 V
- Logic high minimum
- 2.475 V
- Per-pin drive limit
- 12 mA
| Input | Voltage range | Connector | Notes |
|---|---|---|---|
| Vin | 7 to 12 V | — | VIN 5 V |
A 5 V supply input does not establish 5 V tolerance on GPIO. Check the documented power input and logic domain for each connection.
Board-level capabilities
These describe the assembled board. Interface counts do not guarantee simultaneous operation.
| Interface | Support | Count | Details |
|---|---|---|---|
| adc | Documented | 1 | L1count stated in datasheet (adc_channels) |
| sdio | Documented | Unknown | L4, L5, L6, L7, L8, L9 |
| spi | Documented | Unknown | L4, L5, L6, L7, L8, L9, R4, R8, R9, R10, R11, R13 |
| uart | Documented | 1 | L6, R5, R10, R11, R12, R13count stated in datasheet (uart_count) |
| led | Documented | Unknown | R1 |
| control | Documented | Unknown | R1, R4 |
| other | Documented | Unknown | R2, R8 |
| pwm | Documented | 10 | R3, R8, R9, R11count stated in datasheet (pwm_channels) |
| i2c | Documented | Unknown | R5, R8 |
| i2s | Documented | Unknown | R5, R8, R9, R10, R11, R12 |
| usb | Documented | 1 | micro-USB, CP2102 USB-serial bridge |
Memory on the board
Board capacity includes installed memory; chip-local memory is listed separately under each processor.
- Flash
- 4 MiB
- SRAM
- 96 KiB
Capacities use KiB / MiB (1024-based units). Firmware partitions and runtime allocations reduce application-available memory.
Thermal limits by level
Product operating conditions, chip ambient ratings, package case limits and junction maxima remain separate.
Assembled board
ESP8266EX · main processor
CP2102 · usb uart
Mechanical dimensions
Reported product dimensions may exclude protruding components. Unknown height does not establish a complete clearance envelope.
- Length
- 48.26 mm
- Width
- 25.4 mm
- Mounting hole records
- 4
Attached generated geometry is an approximate envelope. A generated outline does not establish an electrically verified PCB footprint.
Board connectors
| ID / type | Pins | Pitch | Notes |
|---|---|---|---|
| usbmicro-USB (Micro-B female) to the CP2102 USB-serial bridge | Unknown | Unknown | — |
| headers2 × 1×15 male pin headers, 2.54 mm pitch, rows 0.9 in (22.86 mm) apart | 30 | 2.54 mm | — |
Software and certifications
- Software frameworks
- Arduino IDE, NodeMCU Lua firmware
Complete structured record
Every available field, including details beyond the summaries. Null means the value has not been established.
Sourcing & files
Supplier offers
US / USD is the target market. Observed price and stock are separate from a delivery quote.
protosupplies.com
US · USD
$6.95Minimum quantity unknown
- Observed stock
- in stock
- Checked
- Oct 18, 2026, 03:45 AM UTC
- Delivery estimate
- Not quoted
This observation is stale or has no verified check time. Recheck with the supplier.
Visit supplier (opens in a new tab)Delivery depends on quantity, postal code and shipping method. A dispatch statement such as “ship today” is not an arrival estimate.
Design files and references
Each source keeps its own verification status. Confirm the part revision and file contents before using it in a design.
Datasheet (opens in a new tab)
Manufacturer reference
ESP8266 NodeMCU V1.0 top (ProtoSupplies) (opens in a new tab)
Unverified reference
inspected: black PCB, ESP-12E (ESP8266MOD) shielded module with PCB antenna, CP2102 QFN, micro-USB, FLASH and RST buttons, 2×15 pins labelled D0 D1 D2 D3 D4 3V3 GND D5 D6 D7 D8 RX TX GND 3V3 / A0 RSV RSV SD3 SD2 SD1 CMD SD0 CLK GND 3V3 EN RST GND Vin; four corner holes; retailer photo
STEP (generated from datasheet drawing) — link unavailable
Generated asset
cad_check passed
Generated envelope geometry may also exist for this record. It does not replace manufacturer CAD or a verified electrical land pattern.
Source evidence
Document provenance, retrieval dates and the field groups supported by each source.
Supports: spec.constraints.electrical.io_voltage_v, spec.constraints.electrical.logic_high_min_v, spec.constraints.electrical.pin_drive_max_ma, spec.constraints.electrical.supply_voltage_max_v, spec.constraints.electrical.supply_voltage_min_v, spec.geometry.cad.assumptions, spec.geometry.cad.bbox.height_mm, spec.geometry.cad.bbox.length_mm, spec.geometry.cad.bbox.width_mm, spec.geometry.cad.envelope_complete, spec.geometry.cad.mesh_path, spec.geometry.cad.step_path, spec.geometry.cad.verification, spec.geometry.dimensions.length_mm, spec.geometry.dimensions.width_mm, spec.geometry.mounting_holes, spec.provides.capabilities, spec.provides.features, spec.provides.gpio_count, spec.provides.memory.flash_kb, spec.provides.memory.sram_kb, spec.provides.software_frameworks, spec.provides.wireless, spec.usage.connectors, spec.usage.pin_mappings, spec.usage.pinout, spec.usage.pinout_complete, spec.usage.requirements.power_inputs
sha256 588efea35941080143af50fa562586067e4a9a4eb6cd553c571b3bbca1a64481
Supports: offers
FAQ
NodeMCU V1.0 ESP8266 (ESP-12E) Board questions
What microcontroller does the NodeMCU V1.0 ESP8266 (ESP-12E) Board use?
The NodeMCU V1.0 ESP8266 (ESP-12E) Board is built around the ESP8266EX, alongside CP2102.
How many GPIO pins does the NodeMCU V1.0 ESP8266 (ESP-12E) Board have?
11 GPIO pins are exposed. Xirkit documents 30 board pins, 17 of them with pin-level electrical limits.
Are the NodeMCU V1.0 ESP8266 (ESP-12E) Board I/O pins 5 V tolerant?
No. The I/O pins are not 5 V tolerant — they run at 3.3 V logic; use a level shifter for 5 V signals. Input-high threshold: 2.475–3.6 V.
How much current can a NodeMCU V1.0 ESP8266 (ESP-12E) Board GPIO pin source?
Documented output-high current per pin: ≤ 12 mA. Values are traced to the chip datasheet; see the pinout table for per-pin limits and conditions.
What voltage powers the NodeMCU V1.0 ESP8266 (ESP-12E) Board?
Supply range 7–12 V. Power inputs: Vin (7–12 V).
How much does the NodeMCU V1.0 ESP8266 (ESP-12E) Board cost?
From $6.95 at protosupplies.com. Prices are observed unit prices before tax and shipping.
What are the NodeMCU V1.0 ESP8266 (ESP-12E) Board dimensions?
48.26 × 25.4 mm. A STEP model is available for enclosure fit checks.
Which interfaces does the NodeMCU V1.0 ESP8266 (ESP-12E) Board support?
adc, sdio, spi, uart, led, control, other, pwm, i2c, i2s, usb.
How do I program the NodeMCU V1.0 ESP8266 (ESP-12E) Board?
Supported frameworks: Arduino IDE, NodeMCU Lua firmware.
Where does this NodeMCU V1.0 ESP8266 (ESP-12E) Board data come from?
Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.
Sources
- NodeMCU V1.0 ESP8266 (ESP-12E) Board datasheet — NodeMCU (open hardware; generic makers)
- protosupplies.com listing