Microcontroller: ATmega168 or ATmega328V
Operating Voltage: 2.7-5.5 V
Digital I/O Pins: 14
PWM Channels: 6
Analog Input Channels: 6
DC Current per I/O Pin: 40 mA
Power Supply: Operates from 2V to 5V
Automatic Reset: Supports automatic reset for easier programming
Flat Design: Completely flat back for easy integration

Microcontroller RP2040 with dual-core ARM Cortex-M0+
Flash Memory 2MB onboard QSPI
Wireless Connectivity 2.4GHz 802.11n LAN support
Form Factor 40 pin 21mmx51mm DIP style
GPIO Pins 26 multi-function 3.3V
Power Supply Flexible options
Programming Interface Comprehensive SDK and examples
Onboard Components CYW43439 wireless chip
Documentation Raspberry Pi Pico Series Documentation
Download Raspberry Pi Pico W Datasheet

MCU: Powerful STM32F103C8T6
Performance: 72MHz work frequency
Memory: 64K flash memory, 20K SRAM
Voltage: 2.0-3.6V power, I/O
USB: Onboard Micro USB interface
Core: ARM Cortex-M3 32-bit CPU
Debug: SWD Mode support
Size: Compact 54mm x 22mm
Weight: Light at only 9g
Download Datasheet

Microcontroller: ESP8266EX
Operating Voltage: 3.3V
Digital I/O Pins: 11
Flash Memory: 4MB
Compatible: Arduino, NodeMCU
Power Supply: 9V-12V Input
On-board Switching: 5V Output
Download Datasheet: Download