Communication

HC-05 Wireless Bluetooth Module
2094-1200106

SparkFun Logic Level Converter Bi-Directional
1066-9941412

9Pin DB9 Solderless Terminal RS232 RS485 Adapter Connector - Female
2133-9923111

Buzzer (Active) - 5V
2106-0300108

Speaker - 0.5W (8 ohm)
2308-9933148

Micro SD Card Reader Breakout
2077-0100313

USB to UART TTL Serial Cable (PL2303HX Compatible)
1746-7813033

USB Wi-Fi (802.11b/g/n) Module with Antenna (great for Raspberry Pi)
1041-7816044

SparkFun FTDI Basic Breakout Board (3.3V)
0342-0800102

Adafruit PCF8523 Real Time Clock Assembled Breakout Board
2352-0600102

Voice Record Module (ISD1820)
2174-9933111

Real Time Clock (RTC) DS1307 Module
1791-9971112

Adafruit FT232H Breakout - General Purpose USB to GPIO+SPI+I2C
2323-0100405

Micro SD Card Reader - USB 2.0
2231-9923173

9Pin DB9 Solderless Terminal RS232 RS485 Adapter Connector - Male
2134-9923112

RFID Reader Module
2132-1000305

SD Card Reader Breakout
2076-1200102

USB to RS485 TTL Serial Converter Adapter
2010-9922411

ELM327 OBD2 Car Diagnostics Bluetooth Adapter (v2.1)
1875-7812075

ESP8266 ESP-01 Serial WiFi Module
1788-9971111

Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE)
1672-0200210

Adafruit Bluefruit LE UART Friend - Bluetooth Low Energy (BLE)
1670-0200209