ESP-01S (esp8266): high-resolution pinout and specs

by Renzo Mischianti · 4 October 2023

Spread the love

The ESP-01S module is an enhanced version of the popular ESP-01 module, featuring improvements in various aspects such as flash memory and stability.

Link to the high resolution image

Here my selection of devices WeMos D1 mini - NodeMCU V2 V2.1 V3 - esp01 - esp01 programmer

Like its predecessor, the ESP-01S is based on the ESP8266 chipset and is designed to add Wi-Fi capabilities to microcontroller projects. It is widely used in IoT (Internet of Things) applications and offers a simple and cost-effective solution for wireless connectivity.

Specs

Processor: L106 32-bit RISC microprocessor core based on the Tensilica Diamond Standard 106Micro running at 80 or 160 MHz^[5]
Memory:^[6]
- 32 KiB instruction RAM
- 32 KiB instruction cache RAM
- 80 KiB user-data RAM
- 16 KiB ETS system-data RAM
External QSPI flash: 1Mb
IEEE 802.11 b/g/n Wi-Fi
- Integrated TR switch, balun, LNA, power amplifier and matching network
- WEP or WPA/WPA2 authentication, or open networks
17 GPIO pins^[7]
Serial Peripheral Interface Bus (SPI)
I²C (software implementation)^[8]
I²S interfaces with DMA (sharing pins with GPIO)
UART on dedicated pins, plus a transmit-only UART can be enabled on GPIO2
10-bit ADC (successive approximation ADC)
Status LED (GPIO1) and power LED