Microcontroller

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Comparison

Flash RAM PSRAM
ESP8266
ESP-01 ext. 1MB 80kB
Wemos D1 Mini ext. 4MB 80kB
NodeMCU
ESP8265
ESP-01 int. 1-2MB
ESP32
WROOM based 4MB 520kB (328k usable) 0MB
ESP32-mini 4MB 520kB 0MB
Lolin32 4MB 520kB 0MB
ESP32 DevKit v1 4MB 520kB 0MB
WROVER based 4MB 520kB 8MB

ESP8266

  • Pinout
Pin Priorities
Pin I2C SPI ESP-01 D1 Mini Comment Boot behaviour
GPIO14 D5 SCK x
GPIO12 D6 MISO x
GPIO13 D7 MOSI x
GPIO5 D1 SCL x
GPIO4 D2 SDA x
GPIO16 D0 x Pulldown resistor high on boot
GPIO15 D8 CS x Boot failure if high
GPIO0 D3 x x Boot failure if low
Inputs
ADC A0 x Analog input
Serial
GPIO1 TX x x TX high on boot, failure if low
GPIO3 RX x x RX high on boot
Strapping Pins (Boot)
GPIO2 D4 x (LED) x high on boot, boot failure if low

ESP32

  • Pinout
    • ESP32-mini: [4]
    • Lolin32: [5]
    • ESP32 Devkit v1 (30pin): [6]
    • ESP32 Devkit v1 (38pin): [7]
  • WROVER = 8MB PSRAM
Pin Priorities
Pin ADC1 DAC RTC(WakeUp) Touch SPI Comment
IO04 x x
IO05 CS
IO16
IO17
IO18 CLK
IO19 MISO
IO23 MOSI
IO25 x x
IO26 x x
IO27 x x
IO32 x x x
IO33 x x x
IO12 x x HSPI (Platform IO JTAG)
IO13 x x HSPI (Platform IO JTAG)
IO14 x x HSPI (Platform IO JTAG)
IO15 x x HSPI (Platform IO JTAG)
Input only
IO34 x x Input only
IO35 x x Input only
IO36 x x Input only, Hall
IO39 x x Input only, Hall
Serial, I2C, SPI
IO1 TX
IO3 RX
IO21 I2C SDA
IO22 I2C SCL
Strapping Pins (Boot)
IO0 x Boot button
IO2 x Block flash
IO5 ?
IO15 Low = no boot log
Flash Chip
IO06
IO07
IO08
IO09
IO10
IO11