This ESP8285 ESP M2 Module provides easy-to-use WiFi for any UART port and is compatible with the HC-06 Bluetooth modules. If your project uses Bluetooth, it is very easy to convert it to WiFi. Using the integrated web interface, WIFI-UART communication can be configured for TCP or UDP sockets on any port.

This RS232 shield is designed for the Arduino controller and can easily convert UART to RS232 interface.

This is a Speaker Expansion Module designed for the BBC micro:bit.

A ESP32 NodeMcu WiFi CP2102 Module with Built-in Antenna, MicroUSB Connector, Bluetooth BLE 4.2, Analog Digital Converter, GPIO with PWM Functions, 12C, SPI, Etc and Supports Remote Firmware Upgrade.

Bi-directional Logic Level Converter 4-channel by I2C BSS138

Open the Original Scheme, Free Download the Development Software Interface, Also Allow Your Needs to Be Modified, Easy and Convenient to Download the Program.

You can simply use Sensors, All Kinds of Electronic Component Connections (such as LED Lights, Buzzer, Buttons and Photosensitive Resistance, etc.), to do all kinds of Interesting Work.

MicroSD card breakout board

The ESP32-CAM is a WIFI + Bluetooth Development Card based on the ESP32 Chip, with the additional possibility of using a camera. It is ideal for a variety of loT applications.

Stem Shield for your Arduino, the Velleman.

An ESP8266 Wifi Shield for Arduino.

The motor shield is based on the L298 , it is a double complete bridge driver designed to drive inductive loads, such as relays, solenoids, DC and stepper motors. 

An Controller Module of XH-M603 Charge, very easy to use, learn more about it here at ElectroFun!