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.
NodeMcu consists of open source firmware and a development kit that helps to prototype your IoT (Intemet of Things) project through some lines of Lua language. The NodeMcu has integrated ESP-12 serial WiFi with GPIO, PWM, ADC, I2C and 1-WIRE capabilities, integrates USB-TTL serial with super reliable industrial strength CH340 for superior stability on all supported platforms.
The Arduino WTV020-SD MP3 Module is a voice recording module with 1GB SD Card storage capacity. You can upload WAV and AD4 format files that conform to FAT formatting. It supports 6KHz to 32KHz, being 36KHz for AD4 files and 6-16KHz for voice sampling rate (Audio Sampling).
