Just the module, 3.3V buck regulator, and the transistors for switching into bootloader mode using DTR and RTS from an external USB-to-serial converter such as a CP2102.

Partlist

Exported from breakout.sch at 2/1/2020 5:14 PM

EAGLE Version 7.4.0 Copyright © 1988-2015 CadSoft

Assembly variant:

Part     Value              Device              Package         Library                Sheet
C1       22u                C_EU_0805           0805            CRAIG_SMD_PACKS_000004 1
C2       0.1u               C_EU_0603           0603            CRAIG_SMD_PACKS_000004 1
C3       0.1u               C_EU_0603           0603            CRAIG_SMD_PACKS_000004 1
C4       0.1u               C_EU_0603           0603            CRAIG_SMD_PACKS_000004 1
C5       10u                C_EU_0805           0805            CRAIG_SMD_PACKS_000004 1
D1       5.5V Zener         DIODE/SHOTKY_SOD323 SOD323          CRAIG_SMD_PACKS_000004 1
JP1                         PINHD-2X10          2X10            pinhead                1
JP2                         PINHD-2X10          2X10            pinhead                1
L1                          INDUCTOR_1008       1008            CRAIG_SMD_PACKS_000004 1
R1       10K                R_US_0603           0603            CRAIG_SMD_PACKS_000004 1
R2       10K                R_US_0603           0603            CRAIG_SMD_PACKS_000004 1
R3       10K                R_US_0603           0603            CRAIG_SMD_PACKS_000004 1
T1       SS8050-G           BC808-NPN-SOT23-BEC SOT23-BEC       transistor             1
T2       SS8050-G           BC808-NPN-SOT23-BEC SOT23-BEC       transistor             1
U1       ESP32_WROVER_V4    ESP32_WROVER_V4     ESP32_WROVER_V4 esp32_wrover_v4        1
U2       BUCK_SEMTECH_SC189 BUCK_SEMTECH_SC189  SOT23-5         CRAIG_SMD_PACKS_000004 1