Description
This simple yet powerful Voltage Divider Module allows you to safely measure higher voltages (up to 25V) using a microcontroller’s analog input. It reduces the input voltage by a fixed ratio of 5:1, making it ideal for Arduino, ESP32, Raspberry Pi Pico, and other embedded systems with 0–5V ADC range.
By using precision 30kΩ and 7.5kΩ resistors (1% tolerance), the module accurately steps down input voltages to a level readable by 3.3V or 5V analog pins. With this module, you can now monitor battery voltage, DC supply levels, solar panel output, or sensor power levels safely and easily.
✅ Key Features
Fixed Voltage Divider Ratio: 5:1 (e.g. 25V in → 5V out)
⚡ Max Input Voltage: 25V DC
Precision Resistors: 30KΩ & 7.5KΩ (1% tolerance)
Simple Analog Sensing: Works with ADC/analog input pins
Clearly Labeled Pins: Easy to integrate with microcontrollers
Compact Module: Fits in breadboards or custom PCBs
️ Ideal for Arduino, ESP8266, ESP32, STM32, and more
Technical Specifications
| Parameter | Value |
|---|---|
| Divider Ratio | 5:1 |
| Max Input Voltage | 25V |
| Resistor Values | 30KΩ & 7.5KΩ (±1%) |
| Output Voltage Range | 0–5V (for input up to 25V) |
| Output Type | Analog (not amplified) |
| Dimensions | Small form-factor module |
Pinout Reference
INPUT Side
• Pin 1 → GND
• Pin 2 → 0–25V DC Input
OUTPUT Side
• Pin 1 → Sense (Analog output)
• Pin 2 → N/C (Not Connected)
• Pin 3 → GND
Common Applications
Voltage monitoring in battery-powered systems
Safe measurement of solar panel or DC adapter output
Analog voltage sensing with Arduino or ESP32
Power supply level monitoring
DC input protection for ADC pins
FAQ – Frequently Asked Questions
Q1: Can I measure 12V using this module with Arduino?
✅ Yes! 12V input will be scaled to ~2.4V at the analog pin — well within Arduino’s 5V ADC range.
Q2: Will it work with a 3.3V microcontroller like ESP8266 or ESP32?
⚠️ Yes, but ensure the input voltage does not exceed ~16.5V (to keep output below 3.3V).
Q3: Is the output digital or analog?
It’s analog. You connect it to an analog input (ADC) on your microcontroller.
Q4: Can I adjust the voltage ratio?
No. It’s fixed at 5:1 using onboard resistors.
Q5: Do I need to calibrate in code?
✅ It’s recommended to map the raw ADC reading back to original voltage (e.g. using (analogRead * 5.0 * 5.0) / 1024.0 for 10-bit ADC).
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