Frequently Asked Questions
Can I use a divider to power things?
No. A divider is for signals and measurements. Use a regulator to power circuits.
What resistor values should I pick?
For ADC inputs, 10 kΩ-100 kΩ totals are common: low enough for accurate readings, high enough to waste little current.
How do I read a 5 V sensor on an ESP32?
A 10 kΩ (R1) and 20 kΩ (R2) divider turns 5 V into 3.33 V, which is safe for a 3.3 V pin. For fast digital signals like I2C, use a proper level shifter instead.
Educational use only. Results are estimates from standard formulas and typical values, provided "as is" without warranty. Always check your part's datasheet and follow safety precautions. Arduino, ESP32, ESP8266 and Raspberry Pi are trademarks of their respective owners; TechsPassion is not affiliated with them. See the full disclaimer.