Tilt Sensor Alarm Circuit


Posted on Feb 5, 2014

Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transistor based design. Home made Tilt sensor for this circuit is an ordinary little glass/plastic bottle with two metal needles inserted through its cap, and a small quantity of water inside. Usually, transistor T1 is in


Tilt Sensor Alarm Circuit
Click here to download the full size of the above Circuit.

inactive state. When the sensor assembly is tilted, both needles inside the sensor (bottle) are short circuited by the water and a positive voltage is available at the base of T1 and it becomes active. Activation of T1 causes the activation of next transistors T2 and T3. After this, T2 supplies constant bias for T1 to make it latched and T3 triggers the SCR(T4) which inturn energises the active piezo-sounder(BZ1). Once activated the circuit can be deactivated by depressing the power/reset switch S1. Preset pot P1 is deliberately added here to adjust the circuit sensitivity. This may become necessary if you are trying a different (readymade) tilt sensor. Similarly, SCR(T4) and piezosounder (BZ1) may be replaced with near equivalent parts. Resistor R3 (100-150 Ohm) is optional. Thanks to Mr. Colin Mitchell for his feedback. My prototype was tested with this home-brewed tilt switch . But it is always better to use a ready-made tilt switch.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    30 Meters CW transmitter
    demystifying use of table pointer in
    switch debounce circuit
    Power Amplifier
    A simple remote control tester circuit diagram
    555 Timer Frequency and Duty Cycle Calculator
    tube tester
    Transistor Circuits
    Recording signal amplifying transistor circuit
    Precision bright light control circuit diagram



    Top