Saturday, March 7, 2015

Circuit Diagram Piezo Trigger Switch using M7555 IC

Robotronicdiagram. - Here is Circuit Diagram Piezo Trigger Switch using M7555 IC like in figure 1 below. Piezo Trigger Switch circuit described here is a microcontroller-compatible shock/impact sensor switch module works on 5VDC supply. The whole circuit can be assembled on a 5×7 cm common circuit board. The piezo-ceramic element (PZ1) can also be mounted on the PCB without any difficulty. The module gives a “Logic-High” (H) output when the sensor (PZ1) detects a valid shock/impact. By default, this high signal is available for a period of near 1 second. However you can change this by modifying the value of the RC time constant components in the CMOS monostable circuit built around M7555CN (U1).

Circuit Diagram

Figure 1. Circuit Diagram Piezo Trigger Switch using M7555
Component List

  • IC1: M7555CN (from NXP)
  • D1: 1N4148
  • LED1: 5mm/3mm Red
  • PZ1: 27mm Piezo-Ceramic Element (Piezo-Disc)
  • R1: 4.7M ¼ w
  • R2: 100K ¼ w
  • R3: 100K ¼ w
  • R4: 1.5K ¼ w
  • C1: 1KpF (102) Ceramic
  • C2: 10uF/16V Tantalum (Plastic Washer for the Piezo: 25mm outer diameter x 20 mm inner diameter x 2mm thickness)


Circuit diagram like in figure 1 above is ICCircuit Diagram Piezo Trigger Switch using M7555 . Proposed circuit board wiring layout is shown here. First of all apply a thin amount of glue to the marked area on the PCB and press a plastic washer (of suitable diameter) into the glue, put aside until the glue is hard. Next, apply little glue on the top of the washer,place the piezo (with presoldered wires) and solder the wires to the circuit board. Decide how you would like to route your wires before you complete this step. It will be harder to move the wires thereafter. Now you can finish the construction by soldering remaining components as indicated in the circuit diagram. After construction, gently hit or knock the piezo sensor with your fingertipor a small hammer to test the circuit. Every time the piezo element receives a hit, the red LED lights up for near one second. Note that the piezo element can easily get damaged, so hit it mildly.

The original article : "Piezo Trigger Switch "

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