5Pcs DIY Touch Vibration Alarm Kit Electronic Training Teaching
$18.35
Shipping:Standard Shipping about 10-25 business days
Secure Payment:Paypal,VISA,MasterCard
Working principle
The touching vibration alarm consists of touch trigger circuit, vibration trigger circuit and alarm circuit. The 555 time base circuit U1 forms the typical monostable operating mode. The transient time is determined by the values of RP1, R2 and C2.
Usually the circuit is in steady state, 555 time base circuit 3 pin output low, the alarm chip does not alarm because there is no power supply. When the human touch the electrode sheet M, the human body induced by the clutter of the signal injected into the 555 trigger pin 2 through C1, or vibration sensor S1 connect instantly because of the vibration, will both cause the U1’s pin 2 to appear instantly low level , So that the 555 circuit flip into the transient, pin 3 mutate to high level, alarm chip works.
Transient time is over, the time base circuit back to steady state, stop the alarm. The length of the alarm time can be adjusted by changing RP1. LED is a two-color light-emitting diodes, green LED bright after power, use as the power indicator light, the red and green light are bright and shows the overall orange when alarming, the resistance of resistor R5 determines the alarm sound play speed, generally take 180K-240K, pay attention to install the resistor before installing the chip, the entire circuit can work under DC 3-6V.
Note
Battery is not included.
Package included
5 x DIY Touch Vibration Alarm Kit
Weight | 0.065 kg |
---|
Customers Also Viewed
28.35ct 20x15mm Purple Oval Elliptical Cut Gemstone VVS AAA Jewelry Loose Gems Decorations
$20.24Lab Clamp & StandAdd to cartSpecificationsMaterial:ZirconColor:PurpleSize:20x15mmWeight:28.35ctClarity:VVS AAAShape:OvalFeatures– Transparent, bright;– Color is bright and the purity is positive;– Wide range of use;– Application for jewelry.Package Included1 Pcs x Purple Oval Cut Gemstone
5pcs CJMCU-250E BMA250E Sensor Module 3-axis Low G Acceleration Sensor Triaxial Accelerometer SPI IIC interface
$32.02Sensor & Detector ModuleAdd to cartFeatureThe BMA250E is a triaxial, low-g acceleration sensor with digital output for consumer applications. It allows measurements of acceleration in three perpendicular axes. An evaluation circuitry (ASIC) converts the output of a micromechanical acceleration-sensing structure(MEMS) that works according to the differential capacitance principle.Package and interfaces of the BMA250E have been defined to match a multitude …
JoyC Rocker Sensor Switch Module STM32F030F4 Control Chip Game Handle I2C Wireless Joystick Device
$54.05Motherboard & Development BoardAdd to cartDescriptionJoyC is a rocker module designed for the M5StickC.It supports two-hand operation. Embedded STM32F030F4 main control chip, using I2C communication protocol and host M5StickC for data transmission. The ran ge of the joystick is 0~200, there are 12 RGB LEDs under the left and right joysticks, and the bottom of the joystick is equipped with …
600-6000MHz UWB WiFi Ultra-wideband Log Periodic Antenna
$32.00RF amplifierAdd to cartSpecification1. Antenna frequency:600-6000MHz2. Antenna standing wave:less than 2 (typical value)3. Antenna polarization:directional linear polarization4. Antenna gain:6-7dB5. Power capacity:50W6. Dimensions:20≠20CM7. Weight:74 g8. Connector form:SMA-K (standard female, outer screw and inner hole)Package included1 x Antenna
Reviews
There are no reviews yet.