情境
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.
這張圖裡有什麼
看懂背後的決策。
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.