Circuit Schematic Piezo Trigger Switch based on M7555CN

555Timer. - Here is Circuit Schematic Piezo Trigger Switch based on IC555. 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).

Figure 1. Schematic Piezo Trigger Switch based on M7555CN
(Source: www.electroschematics.com)

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)
The Original article : "Piezo Trigger Switch Circuit"
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