Piezo ignition is a type of ignition that is used in portable camping stoves, gas grills and some lighters.^[1] Piezo ignition uses the principle of piezoelectricity, which, in short, is the electric charge that accumulates in some materials in response to mechanical deformation. It consists of a small, spring-loaded hammer which, when a button is pressed, hits a crystal of PZT. This sudden forceful deformation produces a high voltage and subsequent electrical discharge, which ignites the gas.

No external electric connection is required, though wires are sometimes used to place the sparking location away from the crystal itself. Piezo ignition systems can be operated by either a lever, push-button or built into the control knob. An electric spark is usually generated once per turn of the knob or press of the button. Eventually, the crystal will no longer be able to emit an electric discharge. However, this takes a long time — piezoelectric igniters usually stop sparking after several tens of thousands of strikes.

The most common material used in piezo ignition systems is lead zirconate titanate (PZT). However, other materials such as quartz and certain types of ceramics can also exhibit piezoelectric properties. These materials generate an electric charge in response to mechanical stress.

While piezo ignition systems are generally safe, it is important to ensure that the igniter is properly connected and maintained. Users should avoid tampering with the igniter mechanism, as improper handling can lead to malfunction or injury.

The piezoelectric effect was discovered by Pierre and Jacques Curie in 1880. The application of this effect in ignition systems began to be explored in the mid-20th century, leading to the development of modern piezo ignition devices.

• Piezo Disassembly — Exposing the piezo element in a barbecue lighter
• Piezo Igniter Life — A destructive test of igniter lifetime