1, B1117 is a three-end regulator, there are two types of adjustable voltage and fixed voltage.
2, the reference voltage of the adjustable voltage is 1.2V.3, the fixed point output has different specifications of 1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5V. 4, you can determine it by measuring with a multimeter in the store state.