Description
Product Overview
The NE555 Delay Monostable Switch Module is a compact, precision timing control board designed to provide accurate and adjustable time delays for 5V systems, including automotive electronics, microcontroller projects, and industrial automation. Based on the legendary NE555 timer IC from Texas Instruments – one of the most popular and reliable integrated circuits in history – this module generates precise timing pulses for equipment that requires a delayed startup or shutdown sequence .
The module operates in monostable mode, meaning it produces a single, stable output pulse each time it receives a trigger signal. When a low-level trigger signal is applied (such as pressing a button or receiving a signal from a sensor), the output relay instantly activates and remains active for a preset duration before automatically deactivating . This makes it ideal for applications like protecting vehicle electronics during ignition, preventing current surge damage, and controlling lights, fans, pumps, or other electrical loads.
The onboard potentiometer allows stepless adjustment of the delay time, typically ranging from 0 to 10 seconds, with the ability to extend the delay range by replacing the timing capacitor . An ultra-bright LED provides visual confirmation of the relay’s active state, and the built-in relay supports loads up to 250V AC at 10A or 30V DC at 10A, making it suitable for controlling both high-voltage household appliances and low-voltage DC equipment.
The 5V version is specifically designed for low-power applications and systems powered by 5V logic, such as Arduino, ESP32, Raspberry Pi, and other microcontroller projects .
Key Features
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Monostable Timing Mode: The module triggers a single timing pulse when a low-level signal is received – perfect for equipment requiring a delayed start after ignition or button press .
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Adjustable Delay Time: Onboard potentiometer allows stepless adjustment from 0 to 10 seconds; the range can be extended by replacing the timing capacitor. Delay formula: T = 1.1 × R × C .
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5V DC Operation: Designed specifically for 5V systems, including Arduino, ESP32, Raspberry Pi Pico, and other 5V microcontroller projects.
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High-Power Relay Output: Built-in relay rated at 250V AC / 10A and 30V DC / 10A, capable of controlling lights, fans, pumps, motors, and other electrical loads up to 2200W .
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Easy Triggering: The module activates with a low-level signal (0V), making it simple to interface with switches, sensors, or microcontroller outputs .
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Visual Status Indicators: Power indicator LED confirms module is powered, while a separate timer LED indicates when the relay is active and the timing cycle is running.
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Excellent Temperature Stability: The NE555 chip offers 0.005%/°C temperature stability, ensuring reliable operation across varying environmental conditions .
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Standby No Power Consumption: The module draws minimal current when idle, preserving battery life .
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Relay Flyback Protection: Built-in protection diode suppresses voltage spikes from inductive loads.
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Operating Voltage | 5V DC |
| Module Type | Monostable (One-shot) Timer |
| Timing Chip | NE555 Precision Timer IC |
| Timing Range (Default) | 0–10 seconds (adjustable via potentiometer) |
| Maximum Timing (Extended) | Hours (by replacing timing capacitor) |
| Trigger Signal | Low-Level (0V / GND connection) |
| Output Type | SPDT Relay (1NO + 1NC contacts) |
| AC Load Rating | 250V AC @ 10A |
| DC Load Rating | 30V DC @ 10A |
| Maximum Load Power (AC) | 2200W / 2000W |
| Temperature Stability | 0.005%/°C |
| Operating Temperature | 0°C to 70°C |
| Standby Power | Negligible (no power consumption when idle) |
| Timing Formula | T = 1.1 × R × C |
| Dimensions (approx.) | 67mm × 21mm × 20mm |
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