Transistor as a key?

Question

Electronic components

Hello,
there is a task to give 3.3 volts per leg of esp8266 (reset) with a foot of MK
which at 5v
can tell you which transistor to power the leg of 8266 so that 5v goes to the base of the transistor
or just make a divider from a pair of resistors .. just resistor values ​​can jump and esp8266 will burn out if exceeded 3.3 in and this is completely inappropriate

Answer 1

A chain / divider of two series-connected resistors of the same rating is placed on the MK leg (connected to the "ground", the resistor ratings are about 4.7 kOhm - 10 kOhm). The connection point of the resistors (5 V /2) is connected to the base of the "digital" transistor PDTC123 (transistor + resistors in one package). The collector through a resistor (4.7 kOhm) is connected to 3.3 V, and directly to the "reset" pin. Just remember that the transistor works like an inverter: on the leg MK 0, on "reset" 1.