Description
Description
The 5V Speed Measuring Relay Module is a compact, intelligent speed monitoring and control device designed for low-voltage automation systems. Operating on a standard 5V DC supply—making it compatible with USB power, Arduino, Raspberry Pi, and other microcontroller platforms—this module detects rotational speed or pulse frequency from sensors and triggers a built-in relay when user-defined speed thresholds are crossed.
The module accepts input signals from a variety of sensors, including Hall effect sensors, proximity switches (NPN/PNP), optical interrupters, and magnetic pickups. When the measured speed (in Hz, RPM, or user-scaled units) falls below or exceeds the preset value, the relay activates or deactivates connected equipment such as cooling fans, alarms, conveyor motors, or warning lights.
With an intuitive interface featuring a digital display and push-button controls, users can set trigger speeds, select overspeed or underspeed monitoring modes, adjust start-up delay times, and configure hysteresis to prevent relay chatter. Housed in a compact, panel-mountable enclosure, this module is ideal for DIY tachometer projects, small motor protection, conveyor belt slip detection, fan speed monitoring, and educational labs—all without requiring complex PLC programming.
Key Features
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5V DC Operation – Compatible with USB power banks, Arduino, Raspberry Pi, and standard 5V power supplies.
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Overspeed & Underspeed Monitoring – Selectable mode to trigger relay when speed exceeds OR falls below setpoint.
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Wide Frequency Measurement Range – Detects signals from approximately 0.5 Hz up to several kHz, suitable for most small motors and rotating machinery.
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Built-in SPDT Relay – Controls external devices up to 10A / 250V AC or 10A / 30V DC.
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Adjustable Start-Up Delay – Prevents false alarms during motor start-up by ignoring speed readings for a configurable period (e.g., 1–30 seconds).
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Adjustable Hysteresis – User-set switching differential prevents rapid relay cycling near threshold.
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Real-Time Speed Display – Digital screen shows current frequency (Hz) or scaled RPM value.
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Non-Volatile Memory – All settings are saved permanently, even after power loss.
Technical Parameters
| Parameter | Value |
|---|---|
| Operating Voltage | 5V DC (±5%) |
| Current Consumption | ≤ 50 mA (relay idle) / ≤ 80 mA (relay active) |
| Input Signal Type | NPN open-collector, PNP, Hall effect, proximity switch (3-wire), TTL pulse (0–5V) |
| Frequency Measurement Range | 0.5 Hz – 5000 Hz (5 kHz) |
| Speed Monitoring Mode | Selectable: Overspeed (relay ON above threshold) / Underspeed (relay ON below threshold) |
| Relay Contact Rating | 10A / 250V AC or 10A / 30V DC (resistive load) |
| Output Terminal Type | 3-pin screw terminal (COM, NO, NC) |
| Start-Up Delay Time | 0 – 99 seconds (adjustable) |
| Hysteresis (Switching Differential) | 1% – 30% of setpoint (adjustable) |
| Operating Temperature | -20°C to +60°C |
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