D&V Engineering

This W3230 AC110-220V Digital Temperature Controller Microcomputer Thermostat Switch features an NTC 10K waterproof temperature sensor. When the temperature of the object reaches a certain set temperature at that time the microcomputer switches on the relay, in turn switching on the device connected to the output terminals.

1. Outdoor use uses involving potential chemical contamination or electrical interference
2. Nuclear energy control systems, combustion systems, railroad systems, aviation systems
3. Medical equipment, amusement machines, vehicles, safety equipment, and installations subject to separate industry or government regulations
4. Systems, machines, and equipment that could present a risk to life or property
5. Domestic freezer, water tanks, refrigerator, industrial chiller, steamer, industrial equipment, and another temperature-controlled system

1. Mini temperature controller.
2. With a clear LED display for better readability.
3. Wide temperature measuring range.
4. Heating or cooling control.
5. All parameters set can be saved after a short circuit.
6. Relay output.
7. High Control precision 0.1 centigrade

1. The XH-W1219 thermostat module with its STM8S µC and I/O (sensor input, keys, double display, relay) can be re-programmed for automation tasks, e.g. timing, control, or counting.
2. Electronic digital thermostat with double 3-digit LED display, extremely bright and red. Operation both in heating and cooling to easily control equipment and devices.
3. The output is electronically controlled by a microprocessor, to guarantee the utmost precision of intervention and an excellent resolution of reading temperature.
4. The NTC probe is waterproof and allows to control the temperature even of fluids, allowing the controlled heated or cooling.
5. Temperature Measurement Range: -50~110℃. Control Precision: 0.1 celsius.

OV7670 Camera Module is a precise small size, high sensitive and low voltage CMOS image Sensor module for capturing and processing the image. It is based on OV7670 image sensor. Through SCCB bus control, the sensor can output the whole frame, sampling, and various resolution of 8 bits of data. The product VGA image can reach up to a maximum of 30 frames per second. Users can completely control the image quality, data format and transmission mode. All the process of image processing functions can be through the SCCB programming interface, including gamma curve, white balance, saturation and chroma.

The OV7670 is a low cost image sensor DSP that can operate at a maximum of 30 fps and 640 x 480 ("VGA") resolutions, equivalent to 0.3 Megapixels. The captured image can be pre-processed by the DSP before sending it out. This preprocessing can be configured via the Serial Camera Control Bus (SCCB). 

In addition, OmmiVision image sensor has been in application of unique sensor technology, by reducing or eliminating optical or electronic defect such as fixed pattern noise, tail, floating away, etc., to improve the quality of the image, and get the clear and stable color images.

Features:-

1. Power supply needs: 5v
2. Interface type: analog
3. Wide detecting scope
4. Fast response and high sensitivity
5. Simple drive circuit
6. Main Chip: The LM393, ZYMQ - 2 Gas Sensor
7. Working Voltage: DC 5 V
8. Great for home or factory gas leakage detection
9. Use for Detecting: Combustible gas such as LPG, butane, methane, alcohol, propane, hydrogen, smoke, etc
10. Size:32mmx22mmx27mm/1.26''x0.86''x1.06''

1. This is RF433 MHz Transmitter Receiver Wireless Module.
2. These are affordable and simple to use RF receivers and transmitters.
3. Its extremely small size coupled with its low power consumption makes it ideal for a variety of applications.
4. These modules can be used with an encoder/ decoder IC pair or can be directly interfaced to a microcontroller/Arduino.
5. This receiver works between 3 - 5V

1. Versatile Compatibility: Compatible with a range of light sources, including lamps, incandescent bulbs, old-fashioned fluorescent lamps, 
2. electronic fluorescent ring lamps, spotlights, transformers, and small electrical appliances.
3. Adjustable Lux Settings: The Lux adjustment feature enables you to customize when the lights turn on based on ambient lighting conditions, ensuring optimal control in any environment.

1. Infrared Sensor Switch Working Voltage :100-240V ; Load Power  40W; Best sensing distance: 3-5M; Mounting Hole Diameter:25mm/0.98 Inch
2. There are 4 wires, Red line is Live wire (L); the outermost blue line is Neutral wire (N); Yellow line and inside blue line connect to light bulb or energy-saving lamp.
3. PIR motion sensor switch has feature of small size and lightweight, easy to install and operate in room or cabinet, plug and play.
4. Function :Auto switch on/off in the dark when you enter into the induction range, and the time delay has 3 way of 15 seconds, 45 seconds, 5 minutes adjustable .In addition to the automatic control of LED lights, it can also be used to control exhaust fans, doorbells or other devices.

1. This is a collection of emission and reception in one photoelectric sensor.
2. Detection distance can be adjusted according to requirements.
3. The sensor has a detection range, interference by visible light small, easy to assemble, easy to use and so on.
4. Can be widely used in robot obstacle avoidance, assembly line and many other automated products.
5. Photoelectric sensor (photoelectric switch) NPN normally open.

• Wide Working Voltage Range: DC 4.5V- 20V
• Detection Distance: 3 to 7m (can be adjusted)
• Blockade time: 2.5s (Defa
• Current Drain: <60
• Detection Angle: <140°

1. Operating voltage : 3.3V to 5V DC
2. LM393 comparator with threshold preset
3. Induction distance: 0.5 Meter
4. Operating current : 4 to 5 mA
5. Microphone sensitivity (1kHz): 52 to 48 dB

1. Operating voltage DC4.5V-20V
2. Output level: High 3.3V / Low 0V
3. Trigger: repeatable trigger (default)
4. Output high signal: easy docking and all kinds of circuits
5. Micro power: quiescent current <50

1. 3-in-1 FUNCTION: This specially designed soil test kit can test soil moisture, pH value and sunlight level of plants , quickly helps you to know the soil condition and do adjustment for better plants care.
2. EASY to USE: This soil tester works by sensing the moisture and chemical ions of the soil, no battery need, no need to be charged either, just plug the probes into the soil about 2-4 inches, then you will easily read the value showed by the pointer at a quick time..
3. PRACTICAL and RELIABLE: Double-needle Detection Technology strongly enhances the speed and accuracy of detecting and analyzing soil moisture and pH acidity, you can read the accurate value at a quicker time, helping you know when you need to water your plant, how to control the pH value in the soil and whether it gets adequate sunlight.
4. WARM PROMPT: While using the tester, please be careful and not let the probes touch stones while inserting. Don't exert too much force, or it will hurt the probes easily. After using, please clean and wipe the probes for next use.
5. PERFECT GARDENING HELPER: This soil can be used both indoors and outdoors, you can test at any time any place as you want, find out what your plants need with a little help from our soil test kit! 

1. Operating voltage: 3.3V~5V; Dual output mode,analog output more accurate; A fixed bolt hole for easy installation
2. With power indicator (red) and digital switching output indicator (green); Having LM393 comparator chip, stable
3. Panel PCB Dimension: Approx.3cm x 1.5cm; Soil Probe Dimension: Approx. 6cm x 3cm; Cable Length: Approx.21cm
4. nterface Description(4-wire); VCC: 3.3V-5V; GND: GND
5. DO: digital output interface(0 and 1); AO: analog output interface

1. Small size, convenient to use, it can accurately measure distance
2. Low voltage, low power consumption, stable performance
3. High measuring precision, strong anti-interference ability
4. Integrated with wire enclosed water-resistant sensor, suitable for wet, harsh measurement occasions
5. Widely used for horizontal distance measuring, obstacle avoidance, automatic control,security, industrial control, etc

1. Voice Record Module is base on ISD1820, which a multiple‐message record/playback device.
2. It can offers true single‐chip voice recording, no‐volatile storage, and playback capability around 10 seconds.
3.  This module is easy to use which you could direct control by push button on board or by Microcontroller such as Arduino, STM32, ChipKit etc.
4.  From these, you can easy control record , playback and repeat and so on.

1. Dual Signal Output (Analog Output, and TTL Level Output)
2. Analog and Digital Output - Threshold for Digital Voltage Can be Set Using on Board Pot.
3. MQ-6 gas Sensor for Propane , Butane , Liquefied Petroleum Gas Sensitivity is High, Natural Gas and has a Good Sensitivity. This Sensor can Detect a Variety of Flammable Gas , is a Low-Cost Sensors for a Variety of Applications
4. Small Sensitivity to Alcohol, Smoke.
5. Relative Humidity:<95% RH.

1. KY-036 Metal Touch Sensor Module
2. Working Voltage: for DC 5V
3. Single channel signal output;Low level output signal used for human body touch sensor alarm
4. Dimensions: 43 x 16 x 15 mm / 1.69 x 0.63 x 0.59 inch; Weight: 3 g / 0.11 oz
5. Color: Red + Blue

1. Product Name : Inductive Proximity Switch;Model : LJ12A3-4-Z-BX;Wire Type : 3 Wire Type (Black, Brown, Blue);Switch Appearance Type : Cylinder Type
2. Theory : Inductive Sensor;Output Type : NPN NO(Normal Open);Thread Diameter : 12mm/0.5" ;Head Diameter : 11.8mm/0.46"
3. Detecting Distance : 4mm;Supply Voltage : DC 6-36V;Current Output : 300mA;Response Frequency : 150Hz
4. Detect Object : Iron;Operating Temperature : -25°C to +55°C (Non-freezing Condition);Size : 6.2 x 2cm/2.4'' x 0.8'' (L*Max. Dia);Cable Length : 110cm/43.3"
5. External Material : Plastic, Alloy;Net Weight : 44g;Color : Silver Tone, Yellow, Gray;Package Content : 2 x Inductive Proximity Switch

1. Main Chip: AOSONG AM2302 High Sensitive Temperature Humidity Sensor
2. Single-bus digital signal output, bidirectional serial data
3. With fixing screw hole, convenient to install and fixed
4. Temperature range: -40 to 80 degree celsius, Temperature measurement accuracy: +/- 0.5℃ degree celsius
5. Humidity measuring range: 0~100%RH, Humidity measurement accuracy: ±2%RH

1. Working voltage: 2.4V to 5.5V
2. Built-in regulator
3. Modes can be selected and configured by the user.
4. Adjustable sensitivity

1. Color: 8 way touch
2. 1, 4 key-board TTP224 capacitive touch sensor IC
3. 2, 4-way board-level status indicator
4. 3, working voltage: 2.4V-5.5V
5. 4, the module can be set to output mode, the key output mode, the longest time and fast output / low power options

1. Digital Capacitive Touch Switch Module is based on TTP223B. Normally, it outputs low and keeps at low power state.
2. When a touch is sensed on the circular marked region, it outputs high and switches to the quick response state. When not being touched for 12 seconds, it switches to low power state again.
3. If the module is mounted in the surfaces of non-metallic materials such as plastic, glass, acrylic, you can make the keys hidden in the walls and desks.
4. Allows you to remove the worry of conventional push-type keys

1. Capacitive touch switches module power supply: 2.5v-5.5v/2W; Multiple trigger mode; Use effect: AB = 00: no lock high TTL level output; AB = 01: self-locking high TTL level output; AB = 10: no lock low TTL level output; AB = 11: self-locking low TTL level output
2. This TTP223 module is based on a touch detection IC ( TTP223 ) of capacitive type touch jog switch module.
3. Touch key switch module stable touching detection of human body for replacing traditional direct switch key.
4. A very useful addition for projects or applications where a conventional mechanical button or switch is not an ideal choice.
5. The touch button capacitive switches module can be installed in plastic, glass surface non-metallic materials. As long as the touch of the correct position, you can make hidden in the

1. This is a breakout board for Freescale's MPR121QR2.
2. The MPR121 is a capacitive touch sensor controller driven by an I2C interface.
3. The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode.
4. The MPR121 also features eight LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs.
5. Brand New & High Quality

1. ESP32-WROOM-32D, Core: ESP32-D0WD ; SPI flash: 32 Mbits, 3.3 V; Crysta: 40 MHz; Antenna: onboard antenna.
2. ESP32-WROOM-32D are powerful, generic Wi-Fi+BT+BLE MCU modules that target a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming and MP3 decoding.
3. The sleep current of the ESP32 chip is less than 5 µA, making it suitable for battery powered and wearable electronics applications.
4. ESP32-WROOM-32D integrate a 4 MB of external SPI flash. The integrated SPI flash is connected to GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and GPIO11. These six pins cannot be used as regular GPIOs.
5. Flash integrated on the module and are not recommended for other uses.

This integrated soil nutrient sensor can measure soil moisture, electrical conductivity, temperature, nitrogen, phosphorus, potassium, and pH 7 elements at the same time. It can be used for long-term and stable measurement of soil conditions in a fixed area at a cheap price. Using RS485 Modbus standard protocol, the signal is stable.

This 7 in 1 soil nutrient sensor solves the problem that users need to purchase multiple soil sensors to measure different soil elements. It consists of five stainless steel probes, which are used to measure soil moisture, temperature, electrical conductivity, NPK, and pH. You can select one or more soil elements to measure or test all soil elements at the same time. The flexibility is very high. The housing of the integrated soil nutrient sensor is sealed with epoxy resin vacuum, completely waterproof, with IP68 protection class. It can be used outdoors for a long time. It is resistant to electrolysis and corrosion.

1. Maximum power consumption: 0.5W (24V DC power supply)
2. Working temperature: -20℃~+60℃
3. Core chip temperature resistance: 85℃
4. Probe material: Anti-corrosion special electrode
5. Sealing material: Black flame-retardant epoxy resin The default cable length: 2 meters, the cable length can be customized as required

1. Capacitive soil moisture sensor module is new version ,Operating Voltage: 3.3 ~ 5.5 VDC;Output Voltage: 0 ~ 3.0VDC
2. This sensor is 3-pin "Gravity" interface, which can be directly connected to the Gravity I/O expansion shield.
3. It is made of a corrosion resistant material giving it a long service life.
4. This analog capacitive soil moisture sensor measures soil moisture levels by capacitive sensing, rather than resistive sensing like other types of moisture sensor.
5. Applications: Garden plants;Moisture detection;Intelligent agriculture

1. Infrared Sensor Switch Working Voltage :100-240V ; Load Power :?40W; Best sensing distance: 3-5M; Mounting Hole Diameter:25mm/0.98 Inch
2. There are 4 wires, Red line is Live wire (L); the outermost blue line is Neutral wire (N); Yellow line and inside blue line connect to light bulb or energy-saving lamp.
3. PIR motion sensor switch has feature of small size and lightweight, easy to install and operate in room or cabinet, plug and play.
4. Function :Auto switch on/off in the dark when you enter into the induction range, and the time delay has 3 way of 15 seconds, 45 seconds, 5 minutes adjustable .In addition to the automatic control of LED lights, it can also be used to control exhaust fans, doorbells or other devices.

1. MQ-8 Hydrogen Gas Sensor
2. Input Voltage : DC5V & Power consumption ( current ): 150mA & DO output: TTL digital 0 and 1 ( 0.1 and 5V) & AO output:0.1-0 .3 V ( relative to pollution ) , the maximum concentration of a voltage of about 4V
3. Special note: After the sensor is powered , needs to warm up around 20S, measured data was stable , heat sensor is a normal phenomenon , because the internal heating wire , if hot is not normal .
4. Size: 32(L)x20(W)x22(H)mm/1.26"x0.79"x0.76"
5. Package Include: 2PCS MQ-8 Sensor Module

1. The INMP441 MEMS Omnidirectional Microphone Module is a high performance, low power, digital output, omnidirectional MEMS microphone with bottom port
2. The complete INMP441 solution consists of a MEMS sensor, signal conditioning, analog to digital converter, anti-aliasing filter, power management and industry standard 24-bit I2S interface.
3. The I2S interface allows the INMP441 to be directly connected to digital processors such as DSPs and microcontrollers without the need for an audio codec for use in the system
4. The INMP441 has a high signal-to-noise ratio and is an excellent choice for near field applications.
5. The INMP441 has a flat wideband frequency response that results in high definition of natural sound.

1. Working voltage: 12VAC dual power supply (12V-0-12V)
2. Power consumption: 5W: IC: NE5532
3. Input interface: RCA; Output interface: 2.54-3P
4. Number of channels: Dual channel audio (Stereo)
5. Adjustment type: 4-way (treble, mid range, bass, volume)

1. Can sense applied force on sensing area in the range of 0g-10kg.
2. Sensing area: 12.7mm
3. Length: approx. 56mm; Width: approx. 13mm
4. FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance.
5. This sensor is simple to set up and great for sensing pressure, but you may not want to use it as a scale for it is not incredibly accurate.

1. 4-20mA Output Soil Sensor
2. 2M Cable with 3-pin Probes
3. Measures Soil Moisture, Temperature, and Humidity
4. Suitable for Agriculture and Environmental Monitoring
5. 4-20mA Output for Compatibility

Simple to use, few operation steps, fast measurement, no reagents, unlimited detection times.

• High measurement accuracy, fast response speed, and good interchangeability.
•  The electrode is made of specially treated alloy material, which can withstand strong external impact and is not easy to damage.
• Completely sealed, resistant to acid and alkali corrosion, and can be buried in soil for long-term dynamic testing.
• The probe plug-in design ensures accurate measurement and reliable performance.
• Soil npk sensor parameters
• Power supply: 5-30VDC
• • Maximum power consumption: ≤0.15W
  • Operating temperature: -40~80℃
  • NPK parameters:
  • Range: 0-1999 mg/kg(mg/L)
  • Resolution: 1 mg/kg(mg/L)
  • Precision: ±2%FS
  • Response time: ≤1S
  • Protection grade: IP68
  • Probe material: 316 stainless steel
  • Sealing material: Black flame-retardant epoxy resin
  • Default cable length: 2 meters, cable length can be customized
  • Dimensions: 45*15*123mm
  • Output signal: RS485/4-20ma/0-5v/0-10v
• Maximum power consumption: ≤0.15W
• Operating temperature: -40~80℃
• NPK parameters:
• Range: 0-1999 mg/kg(mg/L)
• Resolution: 1 mg/kg(mg/L)
• Precision: ±2%FS
• Response time: ≤1S
• Protection grade: IP68
• Probe material: 316 stainless steel
• Sealing material: Black flame-retardant epoxy resin
• Default cable length: 2 meters, cable length can be customized
• Dimensions: 45*15*123mm
• Output signal: RS485/4-20ma/0-5v/0-10v
• Maximum power consumption: ≤0.15W
• Operating temperature: -40~80℃
• NPK parameters:
• Range: 0-1999 mg/kg(mg/L)
• Resolution: 1 mg/kg(mg/L)
• Precision: ±2%FS
• Response time: ≤1S
• Protection grade: IP68
• Probe material: 316 stainless steel
• Sealing material: Black flame-retardant epoxy resin
• Default cable length: 2 meters, cable length can be customized
• Dimensions: 45*15*123mm
• Output signal: RS485/4-20ma/0-5v/0-10v
• Place of origin
• : China
•  

1. Chip built-in 16bit AD converter, 16-bit data output
2. Driver Chip: MPU6050
3. Operating Voltage: 3-5V DC
4. Communication: I2C/IIC Protocol
5. Gyro Range: ± 250, 500, 1000, 2000 °/s
6. Accelerometer Range: ± 2 ± 4 ± 8 ± 16 g

1. 4 degrees of freedom robot arm with more untrammeled and flexible experience.
2. HIGH FLEXIBILITY: The 4-DOF robot arm has more unconstrained and flexible experience.
3. GIFT FOR MECHANICAL ENTHUSIASTS: Ideal robotic arm DIY assembly kit for college students, middle school students, DIY enthusiasts, etc.
4. Package include 1 set of wood cutting parts, 1 pack of screws and 4 sg90 servo, great for you to assemble.
5. Package include 1 set of wood cutting parts, 1 pack of screws and 4 sg90 servo, great for you to assemble.

• Output Signal: Electric frequency signal, high level 5V, low level 0V
• Sensor Angle: Not more than 15 degrees

1. TTP224 4-way switch digital touch capacitive touch sensor module
2. 4 keyboard TTP224 capacitive touch sensor IC
3. Onboard 4-level status indicator.

1. Digital output detection distance adjustable.The analog output sensitivity adjustable, more flexible design
2. Using 1% resistor design, signal output is more accurate, suitable for the needs of high-precision measurement occasions
3. Onboard 3 M3 mounting holes for easy installation
4. 3.3V-9V power supply, and is compatible with most of the SCM system
5. The patch devices used in all SMT process auto matic welding, military quality reliable