I order the REG1117-3.3V IC and after reading the REG1117 datasheet I found the following on page 8 :
Figure 1 shows the basic hookup diagram for fixed-voltage models. All models require an output capacitor for proper operation, and for improving high-frequency load regulation; a 10µF tantalum capacitor is recommended. Aluminum electrolytic types of 50µF or greater can also be used. A high-quality capacitor should be used to assure that the ESR (Effective Series Resistance) is less than 0.5Ω
I will use this regulator to power from microUSB (5V to 3.3V) an ESP8266 and several MPR121 (IC sensor). I was wondering which value for the ESR capacitor should I order ? I don't know which value for the capacitor because there is no other information on the minimal value to avoid instability.