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A small piezo element may only generate microwatts — enough for a low-power MCU waking briefly
if you do have a battery
Output (at Angular Velocity=0): 1
while the relay side needs a separate 12V DC adaptor
LiPo Battery 3.7V 105mAh - Tiny Pouch w/ JST-PH dual axis A small piezo element may3. 7V Lithium Ion Polymer Battery 105mAh The Lithium Ion Polymer Battery 3. 7V 105mAh is a rechargeable lithium cell with a JST connector, designed for portable electronics, wearables, IoT devices, and maker projects. Pair it with a LiPo charger like the TP4056 or Adafruit Micro Lipo. Safety: Lithium batteries can be dangerous if punctured, short circuited, or overcharged. Always use a proper LiPo charger with protection circuitry. 3. 7V battery size
