This is a 5V 4-channel relay interface board, and each channel needs a 15-20mA driver current. This 4-way relay module can be used to control various appliances and equipment with large current. This four-channel relay module is equipped with high-current relays that work under AC250V 10A or DC30V 10A. 5 volts relay driver module has a standard interface that can be controlled directly by the microcontroller. This relay module board allows a wide range of microcontrollers such as Arduino, AVR, PIC, ARM with digital outputs to control larger loads and devices like AC or DC Motors, electromagnets, solenoids, and incandescent light bulbs.

This AT-09 HM10 / HM-10 4.0 BLE Bluetooth Serial CC2540 CC2541 Module For IOS 6/Android 4.3 contains a BLE chip (a CC2540/CC2541). This AT-09 HM-10 Bluetooth Module allows performing serial communication with the BLE chip thanks to an Rx and a Tx pin. This 4.0 Bluetooth Serial Module is also very similar to the HM-10 module and is also compatible with it. So if you have some experience with the latter, you will get started quickly with the AT-09.

The USB to RS485 Converter Adapter module support WIN7 XP Vista Linux Mac OS provides an easy-to-use RS485 interface by means of a Virtual Com Port on the user’s system. There are no command structures, whatever is sent to the Virtual Comm Port is automatically converted to RS485 and vice versa. The module is completely self-powered from the USB bus. Controlling / Communicating with RS-485 devices from your PC has never been easier! This device is plug-and-play. It shows up as a serial/com port and is accessible from applications or hyper-terminal.