ESP32 DevKit V1 (30-pin)
Espressif / generic · ESP32
Wi-FiBLEBT Classic3.3 V
- MHz
- 240
- GPIO
- 25
- Flash
- 4 MB
- RAM
- 520 KB
$8
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Compare 40 popular microcontroller boards, look up any pin, and save time with the built-in calculators every hobbyist needs.
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Popular boards
The ones everyone asks about
Raspberry Pi Pico W
Raspberry Pi · RP2040
Wi-FiBLEBT Classic3.3 V
- MHz
- 133
- GPIO
- 26
- Flash
- 2 MB
- RAM
- 264 KB
$6
Seeed XIAO ESP32-C3
Seeed Studio · ESP32
Wi-FiBLE3.3 V
- MHz
- 160
- GPIO
- 11
- Flash
- 4 MB
- RAM
- 400 KB
$5
Arduino Uno R3
Arduino · AVR
No wireless5 V
- MHz
- 16
- GPIO
- 20
- Flash
- 32 KB
- RAM
- 2 KB
$28
ESP32-S3 DevKitC-1
Espressif · ESP32
Wi-FiBLE3.3 V
- MHz
- 240
- GPIO
- 36
- Flash
- 8 MB
- RAM
- 512 KB
$12
Teensy 4.1
PJRC · NXP i.MX RT
No wireless3.3 V
- MHz
- 600
- GPIO
- 55
- Flash
- 8 MB
- RAM
- 1 MB
$31.50
Calculators
Eight tools you'll actually reuse
Every calculator has its own page with the formula, a worked example and answers to the questions people really ask. Results are shareable with a link.
Resistor Color Code
Decode 4, 5 and 6-band resistors — or find the bands for any value.
LED Resistor
Find the current-limiting resistor for any LED and supply voltage.
Voltage Divider
Work out the output voltage of a two-resistor divider — with optional load.
Battery Life
Estimate runtime from battery mAh, sleep/active current and duty cycle.
Ohm's Law
Fill in any two of voltage, current, resistance or power — get the rest.
555 Timer
Frequency, duty cycle and pulse width for astable and monostable 555 circuits.
Wire Gauge & Current
Pick the right AWG wire size: current rating, resistance and voltage drop.
RC Time Constant
Time constant, cutoff frequency and capacitor voltage over time.
Compare
Head-to-head, no spin
Pick up to three boards and see the specs side by side, with the winner highlighted in every row.
- ESP32 DevKit V1 vs Raspberry Pi Pico W
- ESP32 DevKit V1 vs ESP32-S3 DevKitC-1
- ESP32 DevKit V1 vs ESP32-C3 DevKitM-1
- ESP32-C3 DevKitM-1 vs ESP32-C6 DevKitC-1
- ESP32-S3 DevKitC-1 vs ESP32-S2 Mini
- ESP32-S3 DevKitC-1 vs Teensy 4.1
Pinouts
Click a pin, get the answer
Which pins do ADC? Which ones break boot? Click any pin on the diagram to see its functions, warnings and ready-to-paste Arduino and MicroPython code.
Browse all pinoutsPDF · 2 PAGES
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The Microcontroller Cheat Sheet
Logic levels, pins to avoid, I2C / SPI / UART basics and a quick-pick table of the best boards — on one printable PDF. Enter your email and it's yours.
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Printable
Pro Pinout Pack
High-resolution, print-ready pinout posters for the most popular boards — pin them above your bench.
$7 one-time
See what's insideFrom the blog
Straight-talking guides
5 min read
ESP32 vs Raspberry Pi Pico W: Which Should You Buy?
ESP32 or Pico W? A practical comparison of Wi-Fi, Bluetooth, ADC, PIO, GPIO, power, price and software, with a clear pick for each kind of project.
5 min read
Best Microcontroller for Battery-Powered Projects
Datasheet sleep numbers lie by omission. Learn what really drains your battery and which boards (XIAO, nRF52840, ESP32-C6) last longest.
6 min read
ESP32 Pins You Should NOT Use (and the Ones That Are Safe)
Which ESP32 GPIO pins break boot, flash or Wi-Fi? A clear guide to strapping pins, input-only pins, ADC2 limits, plus a safe-pin list.
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