Adafruit SGP40 Air Quality Sensor Breakout – VOC Index – STEMMA QT/Qwiic

• Infrared Obstacle Avoidance IR Sensor Module (Active Low) contains a pair of infrared transmitting and receiving tubes. When the transmitted light waves are reflected back, the reflected IR waves will be received by the receiver tube. The onboard comparator circuitry does the processing and the green indicator LED comes to life.
• Mounting hole | Adjustable Range Detection | LED Indicators | Built-in Ambient Light Sensor | Infrared transmitting and receiving tubes | Onboard comparator circuitry | Easy to assemble | Easy to use
• LxWxH : 48 x 14 x 8 mm
• The IR sensor module can be widely used for robot obstacle avoidance, obstacle avoidance car assembly line count, black-and-white line tracking and many other occasions. This sensor module can be used for obstacle detection in autonomous robots and cars, in positional feedback for control system, industrial safety system, wheel encoder etc.
• Main Chip : LM393 Operating Voltage (VDC) : 3.6 ~ 5 Average Current Consumption (mA) : 0.06 Detection Angle : 35 ° Distance Measuring Range : 2 – 30 cm

HC-05 is a Bluetooth Transceiver Module and has TTL Output. HC-05 6 Pin Wireless Serial Bluetooth Module is a Bluetooth module for use with any microcontroller.  It uses the UART protocol to make it easy to send and receive data wirelessly. This Bluetooth module is a completely qualified Bluetooth V2+Enhanced Data Rate (EDR). It is 3Mbps Module with 2.4GHz radio transceiver and baseband. It has CSR Bluecore 04, an external single-chip Bluetooth system with CMOS technology and AFH, Adaptive Frequency Hopping, feature.

The HC-06 module is a slave only device.  This means that it can connect to most phones and computers with Bluetooth but it cannot connect to another slave-only device such as keyboards and other HC-06 modules.  To connect with other slave devices a master module would be necessary such as the HC-05 version which can do both master and slave.

Specification and Features:

• Voltage supply: 3.5v to 5v
• Working current: matching for 30 mA, matching the communication for 8 mA.
• Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps.
• With the integrated antenna and edge connector
• Sensitively: -80dBm
• RF Transmit Power: up to +4dBm
• Supported baud rate: 9600, 19200, 38400, 57600, 115200, 230400 and 460800
• Slave default baud rate: 9600
• Data bits: 8
• Stop bit: 1
• Parity: no parity
• A programmable input-output control
• Supported device: laptop, desktop, mobile, tablet
• Protocol: IEEE802.15.1
• Dormancy current: no dormancy.
• Bluetooth module HC-05 Master and slave Two in one module.
• Use the CSR mainstream Bluetooth chip, Bluetooth V2.0 protocol standards.
• Bluetooth protocol: Bluetooth Specification v2.0+EDR
• Security: Authentication and encryption.