ESP32 Calcs

official pin data · free calculators · no login

ESP32 pinout, click any pin, and the math every build needs

An interactive pinout for the DevKitC V4, S3, C3 and C6 — every pin's functions straight from Espressif's official header tables — plus five calculators whose answers include the traps that actually bite: Wi-Fi killing ADC2, GPIO current limits, strapping pins, power injection.

One tap gets you to the tool you came for

Pinout4 boards · official data%Battery lifehours · days · monthsΩLED resistorE24 value + powerAPCB traceIPC-2221, both layers

ESP32 Tools & Guides

Everything ESP32-specific in one place: the interactive pinout tool with each official board's pin functions, and the guides we wish existed when we started — AI hardware builds, starter projects, and the deep-sleep tricks that decide whether your battery project lasts days or months.

Open the hub

Electronics Calculators

The five calculations every microcontroller project runs into — battery runtime, LED resistors, voltage dividers, PCB trace widths and LED strip power — with the practical traps (Wi-Fi vs ADC2, GPIO current limits, power injection) baked into each answer.

Open the hub

The calculators

Battery Life CalculatorBattery runtime for microcontroller projects: enter capacity, active current, duty cycle and sleep current to get real-world battery life in hours and days — the way it actually behaves on an ESP32-class board.LED Resistor CalculatorSeries resistor for one or more LEDs: enter supply, forward voltage and target current to get the exact resistance, the nearest E24 value to buy, actual current and the power rating you need.Voltage Divider CalculatorTwo-resistor voltage divider: output voltage, divider current and dissipation — plus the R2 value that hits a target voltage, and the ESP32 ADC limits that decide whether your reading will actually be stable.PCB Trace Width CalculatorIPC-2221 trace width for your current, temperature rise and copper weight — external or internal layer — plus resistance and voltage drop when you enter the trace length.LED Strip Power CalculatorPower supply sizing for LED strips: enter length and W/m to get total watts, total amps, the PSU wattage to buy with headroom, and how many power injection points the strip needs.

Guides

ESP32 Projects for BeginnersESP32 AI Hardware ProjectsESP32 Deep Sleep & Battery Power GuideHow Many LEDs Can an ESP32 Drive?ESP32 vs Arduino vs Raspberry Pi Pico

What this site does

  • Transcribes each board's pins from the official Espressif user guide, with the source linked on every pin detail.
  • Converts formulas into buying decisions: the E24 resistor to order, the PSU wattage with headroom, the trace width to route.
  • Names the traps (ADC2 vs Wi-Fi, strapping pins, 3.3 V logic, injection points) next to each answer.
  • Runs entirely in your browser — no account, nothing uploaded.

What it doesn't do

  • It isn't an official Espressif reference — verify against the module datasheet for anything safety-critical.
  • It doesn't cover every clone board on AliExpress — boards that aren't in the official docs aren't in the tool yet.
  • It won't pick your parts, tune your antenna, or hold your hand through a dead PSRAM module.
  • Electronics is real: current, heat, and reversed polarity are not theoretical. Double-check your wiring.