Description
The Industrial-Grade Voltage Detection Module is a resistive voltage divider board designed to safely interface high-voltage DC sources with the analog input pins of microcontrollers. Available in 0-25V and 0-100V variants, the module scales the input voltage down to a safe 0-5V range (or 0-3.3V for lower-voltage systems), allowing Arduino, ESP32, Raspberry Pi, and other controllers to monitor batteries, solar panels, power supplies, and industrial DC systems without risking damage to the MCU. The 0-25V version uses a fixed 5:1 divider ratio (30kΩ / 7.5kΩ), while the 0-100V variant employs a higher ratio to accommodate elevated voltages . Both versions feature screw terminals for secure wire attachment and are built with precision resistors for stable, repeatable measurements. The module is suitable for individual makers building battery monitors or DIY power projects, as well as business purchasers seeking a cost-effective sensing solution for equipment diagnostics, solar installations, and automation systems.
Features
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Resistive Voltage Divider Design: Reduces input voltage by a fixed ratio (typically 5:1 for 0-25V version), enabling safe measurement of voltages exceeding the MCU’s analog input limit .
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Screw Terminal Connections: Provides secure, tool-tightened wire attachment for the measured voltage source, reducing the risk of loose connections in permanent installations .
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Wide Compatibility: Outputs an analog voltage compatible with any microcontroller featuring an ADC, including Arduino, ESP32, STM32, and Raspberry Pi (with external ADC).
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Precision Resistors: Uses 1% tolerance resistors in the divider network for stable and repeatable voltage scaling .
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Compact Form Factor: Small PCB footprint allows integration into enclosures, control panels, and prototyping setups.
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No External Components Required: The divider network is fully assembled on the board; only connections to the voltage source and MCU are needed .
Technical Specifications
| Parameter | 0-25V Version | 0-100V Version |
|---|---|---|
| Input Voltage Range | DC 0-25V | DC 0-100V |
| Divider Ratio | 5:1 (30kΩ / 7.5kΩ) | Higher ratio (varies by design) |
| Output Voltage (Max) | 5V (at 25V input) | 5V (at 100V input) |
| Analog Resolution (5V MCU) | 0.00489V (per ADC step) | Depends on divider ratio |
| Minimum Detectable Voltage | 0.02445V (5V MCU) | Depends on divider ratio |
| Resistor Tolerance | 1% (typical) | 1% (typical) |
| Operating Temperature | -20°C to +70°C (typical) | -20°C to +70°C (typical) |
| Connector Type | Screw terminal (input), header pins (output) | Screw terminal (input), header pins (output) |
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