This is a small DC – DC boost module that converts a 0.9 ~ 5v power source to standard 5V, making it capable of supplying power to an Arduino microcontroller and other small electronic devices that use a 5v input. It integrates a PFM DC-DC boost control chip. The maximum output current is up to 500 ~ 600 mA. There are two power input ports, PH2.0 and KF235-3.81-2P which are compatible with DFRobot\’s 3.7 V lithium battery. Note: Please pay attenetion to the battery polarity when connecting the battery. Project 1: Free Energy? Charge Your Mobile Phone with Hands Introduction: Wanna charge your phone in the apocalypse? Maybe my hand crank generator can help you. Hardware componentsDC-DC Boost Module (0.9-5V)9g 180 Micro Servo (1.6kg)1N4007 High Voltage, High Current Rated DiodeCapacitor 100 F Specification Input Voltage: 0.9 V to 5 V Output Voltage: 5 V Conversion Efficiency: 85% (Typ.) Duty ratio coefficient: 66% to 78% The input interface: PH2.0; KF235-3.81-2P Output interface: USB Size: 43 * 33 mm/ 1.69 * 1.3 inches Weight: 14g Documents Schematic Layout Shipping List DC-DC Boost Module x1