Currently I am preparing the bird nest cam. The ESP32 cam can be powered on two levels: On 3.3V or on 5V. In several articles on the web I found the information that the ESP32 Cam does sometimes not work properly when powered on 3.3V. Therefore I decided to power it on 5V. The LiPo cells of my old MacBook deliver 3.7V. So I needed a step up converter also called boost converter.