WeMos D1 Mini ESP8266

WeMos D1 Mini ESP8266 -  11 digital input/output pins, all pins have interrupt/PWM/I2C/one-wire supported(except D0)

1 analog input(3.2V max input)

a Micro USB connection

Compatible with Arduino

Compatible with Nodemcu

ESP32 vs ESP8266 – Which One To Choose?

ESP8266

The Wemos D1 small is unquestionably one of our favorite development boards. It has Wi-Fi, is compact, quick, affordable, and simple to program. In many of our projects, this ESP8266-based board serves as the primary microcontroller. However, as demonstrated by the Nettigo Air Monitor project, in some applications we need to increase the ESP8266's basic clock speed from 80MHz to 160MHz (mainly because of SSL support). Additionally, we are continuously battling for RAM while releasing new features. If we could switch from ESP8266 to ESP32 without altering the pinout, it would be excellent.

Pros: 

The ESP8266 Module's powerful onboard processing and storage technology enables it to be combined with sensors and other applications.

The chip has it extremely well integrated. The user needs extremely little external refer circuitry because of on-chip integration.

The ESP8266 uses APSD for its coexistence interfaces for Bluetooth and VoIP applications. It also contains a self-calibrated radio frequency (RF) that makes it possible for it to function in any environment without the need for extra radio frequency components.

Cons:

In contrast to ESP32, which supports Bluetooth communication, ESP8266 does not.

ESP8266 has a significantly smaller number of GPIOs than ESP32.

ESP32

Wemos D1 mini and ESP32 D1 mini are both boards. Here, the ESP-12F module has been replaced with the more capable ESP32-WROOM-32 module. Furthermore, the two 8-pin connectors' pins continued to function in a functionally compatible manner. There is nothing to stop Retro Fit from using the original design in places where a little bigger size permits. And there are tons of opportunities. The ESP32 D1 small is a dual-core board with a 240MHz clock speed that supports Bluetooth in addition to Wi-Fi. The fact that there are twice as many GPIOs, I2S, or DMA accessible is significant.

A line of inexpensive power systems on chip microcontrollers is called ESP32. A more advanced member of the ESP8266 family is the ESP32. The ESP32 series was created and developed by Espressif Systems. The ESP32 has a dual-core and an ultra-low power co-processor. It was created to address the ESP8266's lack of security.

Pros:  

You can choose from ESP32's dual-core 160MHZ to 240MHZ processors.

With Bluetooth or Wi-fi, you can monitor and operate your gadget for a very minimal cost.

The ESP32 provides additional GPIOs.

You can get a high speed of 150Mbps from ESP32.

Cons:

The ESP32 costs more than the ESP8266.