ESP32 Expert Bench Assistant · Hardware-Locked Calculations

ADC Voltage Divider Max Safe Vout: 3.3V

Scale safe inputs for complex sensor arrays, 5V modules, and 12V LiPo batteries.

Target Maximum Input Voltage (Vin in Volts)

Resistor 1 (R1 - Connected to High Vin) in Ohms

Resistor 2 (R2 - Connected to Ground) in Ohms

Quick Resistor Pairs: 5V → 10k/20k 12V → 10k/3.3k 9V → 10k/4.7k

Output Voltage to ESP32 Pin: 2.98 V

Recommended: Use 11dB Attenuation configuration in code.

Verify if complex loads (Relays, High-Power LEDs, Motors) can run directly from an ESP32 pin.

Source Rail Voltage

Target Component Forward Voltage Drop (Vf in Volts)

Desired Operating Current (mA)

Required Current Limiting Resistor: 86.67 Ohms

Power rating: ~19.5 mW (Standard 1/4W resistor safe)

Rule: Keep continuous GPIO currents ≤ 20mA. Switch heavy coils using 2N2222 NPN or Logic-Level MOSFETs.

Plug-and-play Arduino IDE sketch auto-configured for your calculated resistor values and voltage limits.

// Generated code will appear here

Target Hardware Node / Pin

Physical Multimeter Reading (DMM)

Active Bench Session Log (Persistent on this device)

No physical checks logged yet today.