ESP8266 vs ESP32 vs ESP32-S2 vs ESP32-C3

Product details
	ESP32-C3	ESP32-S2	ESP32	ESP8285	ESP8266

Description	ESP32-C3 is pin-compatible with ESP8266. It has a single core RISC-V 32-bit CPU @160 MHz and includes 400 kB of SRAM and 384 kB of flash built-in.			The ESP8285 is similar to the ESP8266, but has built-in 1 MiB of flash.
Website	https://www.espressif.com/en/products/socs/esp32-c3	https://www.espressif.com/en/products/socs/esp32-s2	https://www.espressif.com/en/products/socs/esp32	https://www.espressif.com/en/products/socs/esp8266	https://www.espressif.com/en/products/socs/esp8266
Release date	2020	2019	2016	2016	2014
CPU	RISC-V 32-bit Single-Core @ 160 MHz	Tensilica Xtensa LX7 32 bit Single-Core @ 240Mhz	Tensilica Xtensa LX6 32 bit Dual-Core @ 160 / 240Mhz	Tensilica LX106 32 bit @ 80 MHz (up to 160 MHz)	Tensilica LX106 32 bit @ 80 MHz (up to 160 MHz)
Coprocessor		ULP (RISC-V)	ULP
RAM	400 KB	320 KB	520 KB	160 KB	160 KB (36 KB available to user)
ROM	384 KB	128 KB	448 KB	1024 KB
UART	2	2	3	2	2
SPI	Yes 3	Yes 4 (OSPI)	Yes 4	Yes 2	Yes 2
Wi-Fi	Yes 802.11b/g/n	Yes 802.11b/g/n	Yes 802.11b/g/n	Yes 802.11b/g/n (max 65Mbps)	Yes 802.11b/g/n (max 65Mbps)
Bluetooth®	Yes 5.0 + BLE	No	Yes 4.2 BR/EDR + BLE	No	No
USB Host	No	Yes	No	No	No
Ethernet (LAN, RJ45)	No	No	Yes 10/100Mbps	No	No
RTC Memory	8 KB	16 KB	16 KB
External SPIRAM		128 MB up to	16 MB up to	16 MB up to	16 MB up to
External Flash		1 GB up to
ESP-MESH	Yes	Yes	Yes	Yes	Yes
CAN			2.0
GPIO	22 (up to)	43	32 (up to)	17 (up to)	17 (up to)
Hall effect sensor	No	No	Yes	No	No
Temperature sensor	Yes	Yes	Yes	No	No
Touch sensors		14	10	No	No
I²C	Yes up to 1	Yes up to 2	Yes up to 2	Yes up to 1	Yes up to 1
I2S	1	1	2	2	2
ADC	Yes 2 × 12-bit SAR ADCs, up to 6 channels	Yes 12 bit SAR ADC up to 20 channels	Yes 12 bit SAR ADC up to 18 channels	Yes 10 bit	Yes 10 bit
DAC		Yes 8 bit up to 2 channels	Yes 8 bit up to 2 channels	No	No
PWM	Yes up to 6	Yes 8	Yes up to 8	No	No
SDMMC		No	Yes	No	No
RMT (remote control)		Yes	Yes	No	No
LCD Interface	No	Yes	No	No	No
Camera Interface	No	Yes	No	No	No
Secure flash	4096-bit OTP	4096-bit OTP secure boot	1024-bit OTP secure boot
Cryptography support	AES-128/256, RSA Accelerator, SHA Accelerator, Random Number Generator (RNG), HMAC	AES-128/192/256, SHA-2, RSA, RNG, HMAC, Digital Signature	AES, SHA-2, RSA, ECC, RNG
Deep sleep consumption		5 µA	10 µA	20 µA	20 µA
Dimensions
Height	5 mm	7 mm	6 mm	5 mm	5 mm
Width	5 mm	7 mm	6 mm	5 mm	5 mm

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