Для хобби, творчества и дома

are sophisticated power control alternatives to bulky mechanical switches. The main function is pushbutton-based latching power control, where one push turns on power and another push turns it off. Additional control inputs allow advanced applications such as automatic shutdown by the device being powered. This low-voltage (LV) version operates from 2.2 V to 20 V and can deliver continuous currents up to around 6 A. The Pololu Pushbutton Power Switch is a compact, solid-state power switch that features built-in reverse-voltage protection and is controlled by a momentary pushbutton: one push turns on power and another push turns it off. This is a patented design initially created for use in our own products as an alternative to bulky mechanical switches. Because the switched current does not flow through the mechanical switch, a large variety of small, low-power switches can be used to control a substantial amount of power. The use of momentary switches also allows multiple switches to be used in parallel to control the power to one load. The board has a small pushbutton already installed and offers convenient points for connecting external pushbutton or tactile switches in parallel. It also offers several alternate pushbutton connection options that result in push-on-only or push-off-only operation, and additional inputs enable further power control options like allowing the load to turn off its own power, which can be beneficial when used with battery chemistries sensitive to over-discharging. Block diagram of Pushbutton Power Switch with Reverse Voltage Protection.
The switch and control inputs control the state of a latching circuit that in turn controls a pair of power MOSFETs through which the main current flows. Benefits and limitations
The Pololu Pushbutton Power Switch works well in its intended application as a DC power switch for small robots, but because it is fundamentally different from a mechanical power switch, the benefits and drawbacks of the components must be fully considered. Benefits over mechanical switches: Compact size
Reverse-voltage protection
Allows multiple (parallel) switches for improved user interface
Better turn-on characteristics than a bouncing mechanical switch
Limited LC spikes for low-resistance loads
Allows self-shutoff (OFF input)
Allows external digital device to control the power state (ON and CTRL inputs)
Breadboard and perfboard compatible (0.1?-pitch)
Drawbacks compared to mechanical switches: Switch is one-directional (power applied to VOUT cannot be switched to VIN)
Limited operating voltage range
Switch can lose its state when power is disconnected (the switch typically defaults to being off when power is first applied, but it can default to being on near the upper end of the operating range)
Switches DC only (does not maintain state through power disruptions or excessive noise)
No complete isolation in off state. - Absolute max voltage: 20 V
- Recommended operating voltage: 2.2 V to 16 V
- MOSFET combined on resistance (max) 26 m? @ 1.8 V 16 m? @ 4.5 V - Continuous current at 55°C 3.0 A
- Continuous current at 150°C 6.0 A
- Maximum current ~210 ?A/V
- Current consumption in on state ~210 ?A/V
- Current consumption in off state ~0.01 ?A
- LED color red
- Size 0.6? ? 0.7? ? 0.12?
- Weight 0.6 g <<

high voltage, high current, 4-channel driver.
Basically this means using this chip you can use DC motors and power supplies of up to 25 Volts, thats some pretty big motors and the chip can supply a maximum current of 600mA per channel, the L293D chip is also what's known as a type of H-Bridge.
The H-Bridge is typically an electrical circuit that enables a voltage to be applied across a load in either direction to an output, e.g. motor.
2 interface for 5V Servo connected to the Arduino's high-resolution dedicated timer - no jitter.
Can drive 4 DC motors or 2 stepper motors or 2 Servo.
Up to 4 bi-directional DC motors with individual 8-bit speed selection.
Up to 2 stepper motors (unipolar or bipolar) with single coil, double coil or interleaved stepping.
4 H-Bridges: per bridge provides 0.6A (1.2A peak current) with thermal protection, can run motors on 4.5V to 25V DC.
Pull down resistors keep motors disabled during power-up.
reset button.
2 external terminal power interface, for seperate logic/motor supplies.
Tested compatible for Arduino Mega, Diecimila & Duemilanove. <<

тока с напряжением от 3 до 30V. Имеет выходной порт 5V DC для снабжения SCM системы и поддерживает 3,3 MCU, что удобно для управления скоростью и направлением вращения двигателей. Также, доступен контроль 2 фаз шагового двигателя. Характеристики: - Чип: L298N double-H Bridge - Клеммы Vms: 5V-35V - Max. ток: 2A на канал - Входные уровни: Высокий TTL 4.5-5,5В, Низкий TTL:0 - Max. потребление: 20W - Другие функции: Индикатор управления, индикатор питания. <<

was widely used in motor speed detection, pulse count, the position limit, etc. Features:
Groove type optical coupling sensor
the output state light, lamp output level, the output low level light.
covered, output high level,Without sunscreen, the output low level.
the comparator output signal is clean, good waveform, driving ability is strong, for more than 15 ma.
has a fixed bolt hole, convenient installation Specification:
- Groove width 10 mm.
- the working voltage of 3.3 V to 5 V
- output form: digital switch output (0 and 1)
- PCB size: 2.3 cmx2cm
- use the LM393 wide voltage comparator <<

Диапазон измерений 0,0510 мг/ л Потребляемый ток, мА 150160 Напряжение питания, В 5 Форма сигнала - TTL/ аналоговая Диапазон рабочих температур, C -20+70 Вес брутто 14.50 Транспортная упаковка: размер/кол-во 48*31.5*27/100 <<

в виде аналогового напряжения. Датчик для измерения концентрации горючих газов от 300 до 10000 ppm.The Датчик может работать при температуре от -20 до 50 ° С и потребляет меньше чем 150 мА при 5 В. Подключение пять вольт через нагревательный (H) контактами удерживает датчик достаточно горячей, чтобы функционировать правильно. Подключение пять вольт либо в А или В контактами вызывает датчик, чтобы излучать аналоговое напряжение на другие выводы. Резистивной нагрузки между выходными контактами и землей устанавливает чувствительность детектора. Пожалуйста, обратите внимание, что изображение в техническом паспорте на верхней неправильной настройке. Обе конфигурации имеют одинаковую распиновку соответствует нижней configuration.The резистивная нагрузка должна быть откалибрована для конкретного приложения с использованием уравнений в таблицу, но хорошее начальное значение для резистор 20 кОм. <<

and industry markets,this sensor is suitable for detecting CH4,Natural gas, LNG, avoid exposure to alcohol, cooking fumes, and cigarette smoke. The sensitivity can be adjusted by the potentiometer. Specification
- Power supply needs: 5V
- Interface type: Analog
- Pin Definition: 1-Output 2-GND 3-VCC
- High sensitivity to CH4,Natural gas
- Small sensitivity to alcohol, smoke
- Fast response
- Stable and long life
- Simple drive circuit
- Size: 40x20mm Shipping List
- Analog Gas sensor (MQ4) 1unit <<