Thermistor Temperature Sensor NTC 10D-20 10 Ohm 6A
NTC thermistor has to be connected in series to the power source circuit to avoid the surge current at the instant when the electronic circuits are turned on. The device can effectively suppress the surge current, and its resistance and power consumption can be greatly reduced after that through the continuous effect of the current so as not to affect the normal work current. Therefore the Power NTC thermistor is the most convenient and efficient instrument to curb the surge current and protect the electronic devices from being damaged.

Thermistor Temperature Sensor NTC 10D-25 10 Ohm 7A
NTC thermistor has to be connected in series to the power source circuit to avoid the surge current at the instant when the electronic circuits are turned on. The device can effectively suppress the surge current, and its resistance and power consumption can be greatly reduced after that through the continuous effect of the current so as not to affect the normal work current. Therefore the Power NTC thermistor is the most convenient and efficient instrument to curb the surge current and protect the electronic devices from being damaged.

A cadmium sulphide light dependent resistor (LDR), also known as photoresistor, photocell. Its resistance goes up in dark and goes down in light.

MQ-5 gas sensor has high sensitivity to LPG, natural gas, methane, propane, butane and small sensitivity to alcohol, smoke.

MQ-2 gas sensor module has high sensitive to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is with low cost and suitable for different application.
Working voltage: DC 5V, DOUT: TTL output, AOUT: Analog output, Preheat time: Over 20s.

MQ-3 Gas Sensor module, sensitive to Alcohol, Ethanol concentrations. Output is proportional to concetration of Alcohol / Ethanol.
Working voltage: DC 5V, DOUT: TTL output, AOUT: Analog output, Preheat time: Over 20s.

MQ-4 gas sensor has high sensitivity to methane(CH₄) and natural gas and small sensitivity to alcohol, smoke.

MQ-7 - MQ7 Gas Sensor module, sensitive to Carbon Monoxide. Output is proportional to concetration of Carbon Monoxide.
Working voltage: DC 5V, DOUT: TTL output, AOUT: Analog output, Preheat time: Over 20s.

The DHT11 is a simple low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, providing a digital output, updated approximately every 2 seconds.

LM35 is a precision centigrade temperature sensor.
Manufacturer: National Semiconductor.

TCST2103 infrared based optical sensor. It contains an IR emiter and receiver pair mounted facing each other. It can be used with encoders to detect wheel speed, angle, etc.

IR Infrared Obstacle Sensor Module PCB - LM358 - Print Out on Toner Transfer Paper.
PCB Size: 0.9"x1.9" (23mm x 48mm), Trace Width: 0.75mm, Mounting Hole: 1 x 3mm. Design Print: On Toner Paper (A5/A6), PCB Design & Printout Ratio: 1:1
Components Required: IC LM358 (1pc), IR Emitter (1pc), IR Receiver (1pc), LED 5mm Red (1pc), Resistor 0.25W 1.5K, 22K & 180 Ohm (1pc each), 3-Pin Relimate Male Header (1pc), Small Preset 20K (1pc), Blank PCB 1x2 (1pc).
Note: You can change the components according to your requirement.

IR Infrared Obstacle Sensor Module PCB - LM358 with Toner Transferred, Ready for Etching.
PCB Size: 0.9"x1.9" (23mm x 48mm), Trace Width: 0.75mm, Mounting Hole: 1 x 3mm, PCB Etching: No, PCB Drilling: No.
Components Required: IC LM358 (1pc), IR Emitter (1pc), IR Receiver (1pc), LED 5mm Red (1pc), Resistor 0.25W 1.5K, 22K & 180 Ohm (1pc each), 3-Pin Relimate Male Header (1pc), Small Preset 20K (1pc).
Note: You can change the components according to your requirement.

IR Infrared Obstacle Sensor Module PCB - LM358
Size: 0.9"x1.9" (23mm x 48mm), Trace Width: 0.75mm, Mounting Hole: 1 x 3mm.
Components Required: IC LM358 (1pc), IR Emitter (1pc), IR Receiver (1pc), LED 5mm Red (1pc), Resistor 0.25W 1.5K, 22K & 180 Ohm (1pc each), 3-Pin Relimate Male Header (1pc), Small Preset 20K (1pc).
Note: You can change the components according to your requirement.

MQ-2 gas sensor has high sensitive to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is with low cost and suitable for different application.