The scenario
A hobbyist is designing a solar-powered ESP32 weather station that must sit in an outdoor enclosure and report temperature, humidity, pressure, and RF status.
What is in this drawing
Read the decisions behind it.
01
Use a fused 5 V USB input with a Schottky reverse-polarity diode before the 3.3 V LDO
02
Share a single 3.3 V rail with 10 uF and 100 nF bypass caps for the ESP32 and both sensors
03
Pull up the I2C SDA/SCL lines to 3.3 V with 4.7 k resistors and include a reset pull-up/switch
04
Route the RF line to an SMA connector and leave its shield as no-connect
Reuse for any ESP32 sensor node on a custom outdoor PCB that needs regulated 3.3 V, I2C environmental sensors, and an external antenna.
More like this