This slide discusses the design challenges that WSN design engineers face. As previously discussed, WSNs are often installed in locations that are inaccessible, and without access to power lines. Batteries provide a finite power supply, and must be replaced to continue operation. Solar power WSNs have very small form factor requirements as well as very lower power consumption requirements. Designing a WSN that uses an energy harvesting system is difficult. Balancing the load consumed with the power supplied by the energy harvesting system is required, but since the power provided by an energy harvesting device is very small the EHS components themselves must consume a very small amount of power. The system overall is very sensitive to the load that the WSN presents. The Cypress Energy Harvesting PMIC can solve these problems. Cypress offers a complete, easy to use solar powered sensor node solution that includes their low power energy harvesting PMIC, the EZ-BLE PRoC Module, plus all the needed firmware and software.