HC-06 RF Wireless Bluetooth Transceiver Slave Module RS232 / TTL to UART converter and adapter. This module is an Upgrade from the older HC-05 and has better stable Firmware. Features: Bluetooth Serial Transceiver Module with backboard. This module includes key interface and state interface compared with Smart Bluetooth Module Baseboard. The Bluetooth Module Baseboard can be compatible with slave mode. Works for Bluetooth TTL transceiver module which allows your target device to both senders receive the TTL data. The key interface on the baseboard is the master mode button and can be controlled by high level from external MCU, and then this module will search again automatically. Built in antenna Bluetooth version: V2.0 EDR

This module integrates DHT11 sensor and other required components on a small PCB. The DHT11 sensor includes a resistive-type humidity measurement component, an NTC temperature measurement component and a high-performance 8-bit micro controller inside, and provides calibrated digital signal output. It has high reliability and excellent long-term stability, thanks to the exclusive digital signal acquisition technique and temperature & humidity sensing technology.

Stable and reliable chipset CP2102 USB specification 2.0 compliant with full-speed 12Mbps. Standard USB type A male and TTL 5pin Supports windows vista/xp/server 2003/200,Mac OS-X/OS-9,Linux Temperature Range: -40Cto 85C

This is the HC-SR04 ultrasonic ranging sensor. This economical sensor provides 2cm to 400cm of non-contact measurement functionality with a ranging accuracy that can reach up to 3mm. Each HC-SR04 module includes an ultrasonic transmitter, a receiver and a control circuit.

The SRF05 is an evolutionary step from the SRF04, and has been designed to increase flexibility, increase range, and to reduce costs still further. As such, the SRF05 is fully compatible with the SRF04. Range is increased from 3 meters to 4 meters. A new operating mode (tying the mode pin to ground) allows the SRF05 to use a single pin for both trigger and echo, thereby saving valuable pins on your controller. When the mode pin is left unconnected, the SRF05 operates with separate trigger and echo pins, like the SRF04. The SRF05 includes a small delay before the echo pulse to give slower controllers such as the Basic Stamp and Picaxe time to execute their pulse in commands