Sensors

IR (Infrared) sensor tuned to 38KHz, perfect for receiving commands  from a TV remote control. Runs at 3V to 5V so it's great for use on the  Raspberry Pi!

To use, connect pin 3 (all the way to the right) to  5V power, pin 2 (middle) to ground and listen on pin 1. It doesn't do  any decoding of the signal, just passes the 'raw data' along.

• Carrier Frequency: 38kHz
• Transmission Range: 45m
• Directivity: 45°
• Supply Voltage Min: 2.5V
• Supply Voltage Max: 5.5V
• Supply Current: 350µA
• Opto Case Style: Through Hole
• Operating Temperature Min: -25°C
• Operating Temperature Max: 85°C
• Packaging: Each
• Operating Temperature Range: -25°C to 85°C
• SVHC: No SVHC (16-Dec-2013)
• Supply Voltage Range: 2.5V to 5.5V
• Manufacturer: VISHAY MINICAST AGC2

• Using an IR remote with a Raspberry Pi

This  one's great, as it can be powered  via the Raspberry Pi's 5V output, and  be read directly from the Raspberry Pi's GPIO input (as the sensor has a  digital 3.3V output!)

This PIR includes an adjustable delay  before firing (approx 0.5 - 200 seconds), has adjustable sensitivity and  two M2 mounting holes! It runs on 4.5V-20V power (or 3V by bypassing  the regulator with a bit of soldering) and has a digital signal output   (3.3V) high, 0V low. Its sensing range is up to 7 meters in a 100  degree cone.

Specifications

• Input Voltage: 4.5V - 20V
• Current Draw: <50µA
• Digital Output: 3.3V (High)
• Digital Output: 0V (Low)
• Working Temperature: -15°C to 70°C
• Delay Time: 0.5 - 200 Seconds
• Sensing Angle: 100° Cone
• Range 5m - 7m

Dimensions

• Sensor Lens Diameter: 23mm
• Length: 24.03mm
• Width: 32.34mm
• Height (with lens): 24.66mm
• Centre screw hole distance: 28mm
• Screw hole diameter: 2mm (M2)

• PIR Sensors and the Raspberry Pi
• Python Library

The only  downside is they use the Dallas 1-Wire protocol, which is somewhat  complex, and requires a bunch of code to parse out the communication. If  you want something really simple, and you have an analog input pin,  the TMP36 is trivial to get going.

We toss in a 4.7k resistor, which is required as a pullup from the DATA to VCC line when using the sensor.

Cable specs

• Stainless steel tube 6mm diameter by 30mm long
• Cable is 36" long / 91cm, 4mm diameter
• Contains DS18B20 temperature sensor
• If  your sensor has four wires - Red connects to 3-5V, Black connects to  ground and White is data. The copper wire is soldered to the wire  shielding
• If your sensor has three wires - Red connects to 3-5V, Blue/Black connects to ground and Yellow/White is data

DS18B20 Technical specs:

• Usable temperature range: -55 to 125°C (-67°F to 257°F)
• 9 to 12 bit selectable resolution
• Uses 1-Wire interface- requires only one digital pin for communication
• Unique 64 bit ID burned into chip
• Multiple sensors can share one pin
• ±0.5°C Accuracy from -10°C to 85°C
• Temperature-limit alarm system
• Query time is less than 750ms
• Usable with 3.0V to 5.5V power/data

• Operating voltage: 3.3V~5V.
  
• Adjustable sensitivity (blue digital potentiometer adjustment)
  
• Dual output mode, analog output more accurate.
  
• A fixed bolt hole for easy installation.
  
• Power indicator (red) and digital switching output indicator (green).
  
• LM393 comparator chip, stable.
  
• PCB Dimension: 3cm x 1.5cm.
  
• Soil Probe Dimension: 6cm x 2cm.
  
• Cable Length: 21cm.
  

• Vcc: Power supply 3.5V to 5.5V
• Signal: Outputs both Temperature and Humidity through serial Data
• Ground: Connected to the ground of the circuit

• With calibrated digital signal output
• Adopt special digital module acquisition technology and temperature and humidity sensing technology to ensure high reliability and excellent long-term stability.
• The sensor is composed of a resistance liquid contact element and an NTC temperature measuring element and is connected to a high-performance 8-bit microcontroller. Therefore, the product has the advantages of high quality, ultra-fast response, strong anti-interference ability, and high-cost performance.
• The single-wire serial interface makes system integration simple and fast. Ultra-small size, low power consumption, and a signal transmission distance of more than 20 meters make it the best choice for any application, even the most demanding ones. The product is easy to connect and can be plugged directly into the sensor expansion board.

Application

• Measure temperature and humidity
• Widely used for IoT projects
• Local Weather station
• Automatic climate control
• Environment monitoring

Specifications 

• • Operating Voltage: 3.0V to 5.5V
  • Operating current: 0.3mA (measuring) 60uA (standby)
  • Output: Serial data
  • Temperature Range: 0°C to 50°C
  • Humidity Range: 20% to 90%
  • Resolution: Temperature and Humidity both are 16-bit
  • Accuracy: ±1°C and ±1%

• How to setup a DHT11 with your Raspberry Pi.
• DHT 11 Datasheet
• https://github.com/adafruit/DHT-sensor-library

This infrared obstacle/object detection sensor is super easy to use. It comes with a potentiometer to adjust the sensitivity. The output is a digital signal so it is easy to interface with any microcontroller such as Maker UNO, Mega, Leornado, Zero, 101, or even the Raspberry Pi or Raspberry Pi Zero. This infrared sensor offers simple, user-friendly, and fast obstacle detection via infrared reflection, it is non-contact detection. As it is based on light reflection, the detection varies with different surfaces. And any infrared source might also interfere with the detection.

It comes in a pair of Infrared emitter and receiver at the front of the module, whenever an object blocks the infrared source, it reflects the infrared and the receiver gets it and the signal goes through a comparator circuit on board. Depending on the threshold that is being adjusted, it will output logic LOW at the output pin and the green LED will light up to indicate the detection. Turning the onboard potentiometer clockwise will increase the sensitivity and further increase the detection range. Compatible with 5V or 3.3V power input.

Note: Please make sure that there is a gap between the emitter and the receiver so that the sensor can work properly.

• Working voltage :   3.3V – 5V DC
  
• Working current  :  ≥ 20mA
  
• Working temperature :   -10°C – 50°C
  
• Detection distance   :  2cm – 40cm
  
• IO interface   : 4-wire interface (-/ /S/EN)
  
• Output signal :   TTL level (low level if obstacle detected, high if no obstacle)
  
• Adjustment method :   multi-turn resistance adjustment
  
• IR pulse frequency   : 38kHz
  
• Effective angle  :  35°
  
• Board Size :   1.6cm x 4cm
  
• Weight  :  9g

• Getting Started with Infrared Sensor Module
  
  

• Dimensions: 40 x 23mm
  
• Weight: 4g
• Working voltage: 3 V - 5.5 V
  
• Port: digital two-way single bus
  
• Temperature range: -40 to 80 °C ± 0.5 °C
  
• Humidity: 20 to 90% RH ± 2% RH
  
• Platform: Arduino, SBC

• Datasheet (DHT22)
• Example Code (Arduino) (Credit to Adafruit)
  
  
  

• 1.8V to 3.6V Supply Voltage
• Low power consumption - 0.5uA at 1Hz
• I2C interface
• Max I2C Speed: 3.5 MHz
• Very low noise - up to 0.02hPa (17cm)
• Fully calibrated
• Pressure Range: 300hPa to 1100hPa ( 9000m to -500m)
• Weight: 1.18g
• Size: 21mm x 18mm

LM393 Sound Detection Sensor Module for controller detects whether the sound has exceeded a threshold value. The sound is detected via a microphone and fed into an LM393 op-amp. The sound level setpoint is set via an onboard potentiometer.
Can be used for Acoustic control light; give sound and light alarm working with Photosensitive sensor

Note: The Maximum induction distance is 0.5M

• Main Chip: LM393, Electret condenser microphone
• Working Voltage: DC 4-6V
• Signal output indication
• Single channel signal output
• The output effective signal is low level
• When there is sound,output low level and the signal lights

• This product is mainly used for water metering
  
• High amplitude ≥ 4.6V
  
• Low amplitude ≤ 0.5V
  
• Electric strength 1250V/min
  
• Insulation resistance ≥ 100MΩ
  
• Hydrostatic pressure testing ≤ 2.0Mpa
  
  

• The lowest rated working voltage: DC4.5 5V-24V
  
• Maximum operating current: 15 mA (DC 5V)
  
• Working voltage range: DC 5~18 v
  
• Load capacity: ≤ 10 mA (DC 5V)
  
• Use temperature: ≤ 80°C
  
• Operating humidity range: 35%~90%RH (no frost)
  
• Allowing pressure: pressure 2.0Mpa
  
• Temperature: -25~ 80 °C
  
• External threads: 1/2"
  
• Outer diameter: 20mm
  
• Intake diameter: 9mm
  
• Outlet diameter: 12mm
  
  

• Maximum Load: 50 W
• Max Switching Voltage: 100V DC
• Minimum Voltage: 250V DC
• Maximum Switching Current: 0.5 A
• Max Load Current: 1.0 A
• Max Contact Resistance: 0.4 Ω
• Temp Rating: -20~ 80℃
• Net Weight: 12g
• Material: PP

• View the project details here
• And some more help here
• Article specific to the anemometer only

• Operating voltage: DC 5V
  
• Total current work: 40mA
  
• Acoustic emission frequency: 40khz
  
• Maximum distance: 2m
  
• Blind: 25cm
• Resolution: about 0.5cm
  
• Angle: 70 degrees
  
• Working temperature: -10 ~ 70 ℃
  
• Storage temperature: -20 ~ 80 ℃

• small size, easy to use;
  
• low voltage, low power consumption;
  
• high accuracy;
  
• strong anti-jamming;
  
• integrated with wire enclosed waterproof probe, suitable for wet, harsh measuring conditions.

• Size: 3.5 x 1cm
  
• Power supply: 5V DC
  
• Detector distance: 10mm
  
• Build-in Tcrt5000 Sensor NSOR
  
• Applicable to a variety of platforms including Arduino / AVR / ARM /PIC