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KY-008 laser sensor module: Operating voltage: 5V Specifications: 15 * 24 mm Light source wavelength: 650 nm Weight: 2.2 g Obstacle avoidance sensor module: VCC: 3.3V-5V external voltage (can be directly connected to the 5v and 3.3v microcontroller MCU) GND: External GND OUT: Small board digital output interface (0 and 1) Connection method: VCC-VCC; GND-GND; OUT-IO Board size: 3.2 x 1.4cm Flame sensor module: Operating voltage: 3.3V-5V Output form: DO digital switching output (0 and 1) and AO analog voltage output Size: 3.2cm x 1.4cm Detect flame or wavelength range (approx): 760 nm to 1100 nm£¬ lighter flame test distance is 80cm£¬ the greater flame£¬ the farther test distance Detection angle is about 60 degree£¬ particularly sensitive to flame photometry Adjustable sensitivity 315M wireless transceiver module: Operating voltage: DC5V Quiescent current: 4Ma Receiving frequency: 315MHz Receiving sensitivity: -105DB Size: 30 x 14 x 7mm Emission head parameters: Transmission distance: 20-200 meter (different voltage£¬ different effect) Operating voltage: 3.5-12V Dimension: 19 x 19mm Work: AM Transfer rate: 4KB / S Transmitting power: 10mW Transmission frequency: 315M Pinout left → right: (DATA£¬ VCC£¬ GND) One channel TCRT5000 tracing module: Detection distance: about 10mm Operating voltage: 5V£¬ black line output low level£¬ white line output high level Shock sensor module: Operating voltage: 3.3V-5V Output type: Digital switching output (0 and 1) Small PCB board size: 3.2cm x 1.4cm MQ-2 gas sensor module: Dimension: 32 x 22 x 27mm (L x W x H) The main chip: LM393£¬ ZYMQ-2 gas sensor Operating voltage: 5V DC Dual signal output (analog output£¬ and TTL level output) TTL output valid signal is low level. (When the output low level signal light can be directly connected microcontroller) Analog output: 0 ~ 5V voltage£¬ the higher the concentration the higher the voltage. Sound sensor module: Operating voltage: 3.3V-5V Small PCB board size: 3.4cm x 1.6cm DHT11 temperature and humidity sensor module: VDD: 3.3-5.5V DC DATA: Serial data NC: No connection GND: Grounding£¬ negative power supply HC-SR04 ultrasonic sensor module: Operating voltage: 5V Ultra-small quiescent current: less than 2mA Induction angle: not more than 15 degrees Detection distance: 2cm-400cm High precision: up to 0.3cm