This breakout board uses the LTC3588 Piezoelectric Energy Harvester from Linear Technologies. This board can be used not only for harvesting piezoelectric energy, but solar energy as well. There is a bridge rectified input for piezo elements (PZ1 and PZ2) and a direct input (VIN) for DC sources. Both are clamped to 20V. In addition, the board can simply be used as a standalone nanopower buck regulator.

Ultra-Low-Power 1.8V Piezoelectric Energy Harvesting RF Sensor Node with Apollo3 Blue, LTC3588-1, STTS22H, and OPA333