0-25V DC Voltage Sensor Module – Resistive Divider, Analog Output, Arduino Compatible

The VOLTAGE-SENSOR module is a resistive voltage divider board that lets an Arduino or other microcontroller measure DC voltages well above the 5V limit of its analog input. The input terminal accepts up to 25V DC, and an onboard 5:1 divider (30 kΩ and 7.5 kΩ resistors) scales that voltage down to a safe 0–5V range for the ADC. Combined with the 10-bit ADC found on AVR-based boards, this gives an analog resolution of 0.00489V and a usable detection range from 0.02445V to 25V. When used with a 3.3V system, the maximum measurable input falls to approximately 16.5V, because the divider output must stay within the ADC reference. The board is compact at 13.7 × 27.3 mm and connects with a simple three-terminal interface (VCC, GND, S), making it straightforward to wire into breadboards and expansion shields. Typical uses include monitoring lithium and lead-acid battery packs, checking SMPS output rails, detecting overvoltage and undervoltage conditions in protection systems, and building simple digital voltmeters with an LCD1602 display. This voltage sensor module is a practical, low-cost way to add voltage measurement to robotics, automotive, telecom, and DIY electronics projects without risking the microcontroller's analog pins.

1. Monitoring lithium-ion, Li-Po, and lead-acid battery pack voltages.
2. Checking the output voltage of switching mode power supplies (SMPS).
3. Detecting overvoltage and undervoltage conditions in protection and BMS circuits.
4. Building digital voltmeters with an Arduino and LCD1602 display.
5. Voltage monitoring in robotics, automotive (12V and 24V systems), and telecom equipment.
6. DIY and educational electronics projects that require safe voltage measurement above 5V.

1. Model: VOLTAGE-SENSOR.
2. Input voltage range: DC 0–25V.
3. Voltage detection range: DC 0.02445V–25V.
4. Voltage divider ratio: 5:1 (30 kΩ and 7.5 kΩ resistors).
5. Analog output voltage: 0–5V (scaled input).
6. Analog resolution: 0.00489V (with a 10-bit ADC at 5V reference).
7. Maximum input on 3.3V systems: approximately 16.5V.
8. Interface: VCC (measured voltage positive), GND (measured voltage negative), S (analog signal to microcontroller).
9. ADC compatibility: 10-bit Arduino ADC (0–1023).
10. Dimensions: 13.7 × 27.3 mm.