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This module is made using Alcohol Gas Sensor MQ3. It is a low cost semiconductor sensor which can detect the presence of alcohol gases at concentrations from 0.05 mg/L to 10 mg/L. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. It’s conductivity increases as the concentration of alcohol gases increases. It has high sensitivity to alcohol and has a good resistance to disturbances due to smoke, vapor and gasoline. This module provides both digital and analog outputs. MQ3 alcohol sensor module can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc.
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Description
This is a 2-Channel Relay interface board, which can control various appliances, and other equipments. It can be controlled directly by Microcontroller. Rated voltage: DC12 Rated current: 10A Coil power: 0.36W Contact switch voltage: 220VAC Protective characteristics: Sealed Contact load: Medium-power Application: Electromagnetism Contact Form: Conversion type With 4 mounting holes, diameter of each hole is 3.1mm, easy to install Apply superior SONGLE relay, SPDT(single-pole double-throw), one common port, one NO and one NC Opto-isolator, excellent anti-interference performance Low level actuation(indicator ON), high level release(indicator OFF) Maximum output of relay: DC 30 -
The nRF24L01 is used on a wide variety of applications that require wireless control. They are transceivers which this means that each module can transmit and receive data. These modules are very cheap and you can use them with any microcontroller (MCU). Specifications nRF24L01 – 2.4GHz RF Transceiver
- Low cost single-chip 2.4GHz GFSK RF transceiver IC
- Range with Antenna: 250Kb rate (Open area) >1000 meter
- Power: Ultra low power consumption
- Input Voltage: 3.3V
- Pins: 5V tolerant
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L9110 chip is able to drive a single DC motor using two digital control inputs. One input is used to select the motor direction while the other is used to control the motor speed. Speed is controlled by using PWM Pulse Width Modulation. Motor drivers typically have what is called a truth table that determines the effect of its inputs.
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The sensor has a sensitive filament made of SnO2. In the presence of clean air, this filament tends to have lower electrical conductivity. When a combustible gas such as LPG is introduced, the filament’s conductivity rises, and the amount of change in it’s conductance/resistance can be used to indicate the equivalent gas concentration. This effect tends to be particularly pronounced at higher temperatures, and resistive heating element is present as well. SnO2 is particularly sensitive to Methane, Butane and Propane, but is also sensitive to other combustible gases as well.
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This is a simple-to-use liquefied petroleum gas (LPG) sensor, suitable for sensing LPG (composed of mostly propane and butane) concentrations in the air. The MQ-6 can detect gas concentrations anywhere from 200 to 10000ppm. This sensor has a high sensitivity and fast response time. The sensor’s output is an analog resistance. The drive circuit is very simple; all you need to do is power the heater coil with 5V, add a load resistance, and connect the output to an ADC.
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A unipolar stepper motor has one winding with center tap per phase. Each section of windings is switched on for each direction of magnetic field. Since in this arrangement a magnetic pole can be reversed without switching the direction of current, the commutation circuit can be made very simple (e.g., a single transistor) for each winding. Typically, given a phase, the center tap of each winding is made common: giving three leads per phase and six leads for a typical two phase motor. Often, these two phase commons are internally joined, so the motor has only five leads.
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Description
- The mini USB LED light is good for camping and desktop/laptop lighting .
- It is quite convenient,the light will turn on/off when you touch the back of the sensing area.
- the light can be dimmer when you touch the back of the sensing area.
- It is compatible with all standard USB plug device, such as power bank, car/mobile charger, desktop computer, laptop, etc.