ESP types

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ESP32 types

CPU SRAM ROM Flash RTC SRAM Wifi Bluetooth GPIO ADC release
ESP32 1x/2x LX6 520KiB 448KiB b/g/n 2.4G 4.2 34 12bit 2016
ESP32-S2 1x LX7 320KiB 128KIB 0-4MB 16KiB b/g/n 2.4G - 43 2x13bit 2019
ESP32-S3 2x LX7 512KiB 384KiB 0-8MB 16KiB b/g/n 2.4G 5 LE 45 2x12bit 2020
ESP32-C2 1x RISC-V 272KiB 576KiB 1-4MB 5 LE 14 2022
ESP32-C3 1x RISC-V 400KiB 384KiB 0-4MB 8KiB b/g/n 2.4G 5 LE 22/16 2x12bit ESP8266 pins comp. 2020
ESP32-C6 1x RISC-V 512KiB 320KiB 0-4MB b/g/n/ax 2.4G 5.3 LE 30/22 12bit Zigbee + Thread 2023
ESP32-H2 1x RISC-V 256KiB 2-4MB 5.3 LE 19 Zigbee + Thread
ESP32-C5 1x RISC-V 400KiB 384KiB b/g/n/ax 2.4G 5 LE 20+ ?
ESP32-P4 2x RISC-V 768KiB - - 50+ ?


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