This moisture sensor can read the amount of moisture present in the soil surrounding it. It's a low tech sensor, but ideal for monitoring an urban garden, or your pet plant's water level. This is a must have tool for a connected garden!

This sensor uses the two probes to pass current through the soil, and then it reads that resistance to get the moisture level. More water makes the soil conduct electricity more easily (less resistance), while dry soil conducts electricity poorly (more resistance).

It will be helpful to remind you to water your indoor plants or to monitor the soil moisture in your garden.

Specification

• Power supply: 3.3v or 5v
• Output voltage signal: 0~4.2v
• Current: 35mA
• Pin definition:
  • Analog output(Blue wire)
  • GND(Black wire)
  • Power(Red wire)
• Size: 60x20x5mm
• Value range:
  • 0 ~300 : dry soil
  • 300~700 : humid soil
  • 700~950 : in water

PRODUCT DESCRIPTION

1 VCC external 3.3V-5V voltage (can be directly connected with the 5V MCU and 3.3V chip)

   2 GND external GND

   3 IN external microcontroller I/O port, I/O port has been designed with 10K pull-up resistor

   Theoretical test suite from 5-8 meters, but the surrounding environmental factors depends on when you use the actual application and intermediate barrier (e.g. diaphragm, glass, hinder the barrier or other materials), receiving head using HX1838, with a power indicator light, can receive the 38K frequency of any remote control coding data!

PRODUCT FEATURE

   1, sensor using HX1838, high sensitivity

   2, working voltage 5V

   3, output: digital output

PACKAGE INCLUDED

   1×Infrared Remote Controller Kit

ultrasonic sensor provides an easy method of distance measurement. This sensor is perfect for any number of applications that require you to perform measurements between moving or stationary objects.

Interfacing to a microcontroller is a snap. A single I/O pin is used to trigger an ultrasonic burst (well above human hearing) and then "listen" for the echo return pulse. The sensor measures the time required for the echo return, and returns this value to the microcontroller as a variable-width pulse via the same I/O pin.

Application Ideas:

• Security systems
• Interactive animated exhibits
• Parking assistant systems
• Robotic navigation

• Features:
  Add an ear to your project with this well-designed electret microphone amplifier.
  This fully assembled and tested board comes with a 20-20KHz electret microphone soldered on. For the amplification, we use the Maxim MAX4466, an op-amp specifically designed for this delicate task.
  The amplifier has excellent power supply noise rejection, so this amplifier sounds really good and isn't nearly as noisy or scratchy as other mic amp breakouts we've tried!
  This breakout is best used for projects such as voice changers, audio recording/sampling, and audio-reactive projects that use FFT. On the back, we include a small trimmer pot to adjust the gain.
  You can set the gain from 25x to 125x. That's down to be about 200mVpp (for normal speaking volume about 6" away) which is good for attaching to something that expects 'line level' input without clipping, or up to about 1Vpp, ideal for reading from a microcontroller ADC.
  The output is rail-to-rail so if the sounds gets loud, the output can go up to 5Vpp!
  
  Specifications:
  Material: electronic element
  Color: purple
  Size: 10x15mm

• Bosch has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI!
• This precision sensor from Bosch is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuracy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with ±1 meter accuracy

•  

   

        Typical application：

• Enhancement of GPS navigation
• e.g.time-to-first-fix improvement，dead-reckoning，slope detection
• Indoor navigation（floor detection，elevator detection）
• Outdoor navigation，leisure and sports applications
• Weather forecast
• Health care application（e.g. sirometry）
• Vertical velocity indication（e.g. risk/sink speed）
• Target devices
• Handsets such as mobile phones ,table PCs,GPS devices
• Navigation systems
• Portable health caredevices
• Home weather stations
• Flying toys
• Watches
• PCB size:(L*W)1.52* 1.20cm/0.60"*0.47"

• 
  
  You can find the complete datasheet here. 
  
   

  This sensor support both I2C or SPI interface. The wiring for this sensor is simple. Note that this sensor require 3.3v, so if you use Arduino Uno, use the 3.3v pin.
   
  Wiring sensor and Arduino:
   
• VCC <----> 3.3v
• GND <----> GND
• SCL/SCK <----> A5(Analog pin 5)
• SDA/SDI <----> A4(Analog pin 4)

• This is a small (0.4 in x 0.3 in) breakout board for TDK's (Invensense's) ICS43434 bottom-ported, digital microphone that outputs I2S audio as a stream of 24-bit serial words that can be directly read by any microcontroller with an I2S port. No CODEC is required to decode the audio data!

  The ICS43434 has the same low noise and high sensitivity as the ICS43432 but cuts the power usage from 1.1 mA in normal mode to ~500 uA and adds a low-power mode which uses just 230 uA. That's right, the ICS43434 uses only 20% of the power of the ICS43432!

  The pinout is straightforward. The microphones are NOT 5 V tolerant so apply no more than 3.6 V to 3V3 on the board.

  On the Teensy 3.2, CLK connects to Teensy pin 9 (BCLK), WS connects to Teensy pin 23 (LRCLK), and pin 13 is the serial data out.

• small, low cost MEMS mic with a range of about 50Hz - 15KHz
• there are three digital pins:
• The microphone is a single mono element
• This I2S MEMS microphone is bottom ported
• MEMS mics can detect sound and convert it to voltage

MF52 10K thermistor (ceramic)

• The sensor uses the FR-04 high-quality double-sided materials, King Size 5.0 * 4.0CM, and with the surface of the nickel plating treatment, against oxidative, conductivity, superior performance and longevity;
• Operating voltage 3.3V-5V
• Sensitivity can be adjusted via potentiometer
• Small board PCB size: 3.2cm x 1.4cm

• Working Voltage Range: DC 4.5V- 20V
• Current drain:<60uA
• Voltage Output: High/Low level signal:3.3V TTL output
• Detection distance: 3--7M(can be adjusted)
• Detection range: <140°
• Delay time: 5-200S(can be adjusted, default 5s +-3%)
• Blockade time: 2.5 S (default)
• Trigger: L: Non-repeatable trigger H: Repeat Trigger (default)
• Work temperature:-20-+80°C
• Trigger Method: L unrepeatable trigger / H repeatable trigger

• Input voltage: 4.5V-5.5V
• Full charge voltage: 4.2V
• LEDs: red - charging | green - charged
• Input interface: mini USB and Solder plates
• Work temperature: -10ºC to 85ºC

• This ir transmitter sensor module is directly launched by a single tube, it requires waveform modulation through the program.
• It is suitable for infrared communication, infrared remote control, apply to a variety of platforms including Arduino/51/AVR/ARM
• With signal indicating LED, easy to observe and debug

• Chip: MPU-6050
• Onboard LDO regulator. GY-521 operating voltage: 3V ~ 5V
• Communication: I2C
• Built-in 16bit AD converter, 16bit data output
• Gyroscopes ranges: +/- 250 500 1000 2000 degree/sec
• Acceleration ranges: +/- 2g, +/- 4g, +/- 8g, +/- 16g
• Pin Spacing: 2.54mm (0.1in)

Product Features:

.Brand new 37 in 1 Sensor Kits for Arduino

.Material: Circuit board

.Includes basic components and sensors

.Compatible with  

Specifications:

. 

Package Included:

. 1 x Small passive buzzer module 

.1 x 2-color LED module 

.1 x Hit sensor module 

.1 x Vibration switch module 

.1 x Photo resistor module 

.1 x Key switch module 

.1 x Tilt switch module 

.1 x 3-color full-color LED SMD module

.1 x Infrared emission sensor module 

.1 x 3-color LED module 

.1 x Mercury open optical module 

.1 x Yin Yi 2-color LED module 3MM 

.1 x Active buzzer module 

.1 x Temperature sensor module 

.1 x Automatic flashing colorful LED module 

.1 x Mini magnetic reed modules 

.1 x Hall magnetic sensor module 

.1 x Infrared sensor receiver module 

.1 x Class Bihor magnetic sensor 

.1 x Magic light cup module 

.1 x Rotary encoder module 

.1 x Optical broken module 

.1 x Detect the heartbeat module 

.1 x Reed module 

.1 x Obstacle avoidance sensor module 

.1 x Hunt sensor module 

.1 x Microphone sound sensor module 

.1 x Laser sensor module 

.1 x 5V relay module 

.1 x Temperature sensor module 

.1 x Temperature sensor module 

.1 x Linear magnetic Hall sensors 

.1 x Flame sensor module 

.1 x Sensitive microphone sensor module 

.1 x Temperature and humidity sensor module 

.1 x XY-axis joystick module 

.1 x Metal touch sensor module 

100K ohm NTC 3950 Thermistors with cable for 3D Printer

his tipping bucket rain gauge has a magnetic reed switch that closes momentarily each time the gauge measures 0.011" (0.2794 mm) of rain.

The 9 foot (3 meter) cable terminates in an RJ11 modular plug, and can easily be extended using a common telephone extension cable.

The gauge can be easily connected to an Arduino, Rapberry Pi, or any microcontroller. Commonly a pull-up resistor (4.7k ohms is typical) will be used to pull the input pin high, and the other side of the gauge's switch will be connected to ground, pulling the pin low each time the switch closes.

https://www.sparkfun.com/products/8942