Description
Product Overview
The 5V NE555 Automatic Water Level Controller Module is a smart, self-contained electronic control board designed to automate water tank filling and pump control operations. Built around the legendary NE555 timer IC from Texas Instruments – one of the most reliable integrated circuits in electronics history – this module provides a cost-effective, maintenance-free solution for preventing tank overflows and pump dry-running .
The controller continuously monitors water levels in both overhead (upper) and ground (lower) tanks using simple electrode probes . When the water level in the overhead tank falls below a preset low level, the module automatically turns the pump ON . When the water reaches the preset high level, the module turns the pump OFF, preventing spillage and waste .
What sets this module apart is its dual-tank monitoring capability and dry-run protection. A dedicated sensor in the lower (source) tank ensures that if the water level there falls below a safe minimum, the controller overrides all other commands and shuts the pump OFF immediately . This protects your pump from running dry, which can cause overheating and permanent damage .
The module is designed to work with 5V DC power, making it compatible with USB power banks, 5V wall adapters, or directly from a 5V microcontroller supply. The relay output can control pumps, solenoid valves, or other electrical loads up to 250V AC at 10A or 30V DC at 10A .
Key Features
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Automatic Fill Control: Monitors water levels in overhead tanks using three electrode probes (low, high, common). Pumps water when low, stops when high .
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Dual-Tank Monitoring: Simultaneously monitors both the overhead (destination) tank and the ground (source) tank .
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Dry-Run Protection: A dedicated low-water sensor in the source tank prevents the pump from running when water is insufficient, protecting the pump from damage .
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NE555-Based Timing & Control: Utilizes the industry-standard NE555 timer IC for reliable hysteresis control – no microcontroller programming required .
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Simple Electrode Sensing: Uses three stainless steel probes for the overhead tank (A=High, B=Low, C=Common) and two probes for the source tank (D=Low, E=Common) .
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Manual Override Capability: Includes push-button switches for manual pump start (SW1) and stop (SW2) .
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LED Status Indicators: Power indicator and pump status LED for easy monitoring of system state .
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Relay Output: Built-in relay rated for 250V AC at 10A or 30V DC at 10A, capable of directly controlling pumps, solenoid valves, or contactors .
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5V DC Operation: Low-voltage control side keeps electronics safe; the relay isolates the high-voltage pump circuit .
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Debounced Sensing: Includes filter capacitors to prevent false triggering due to water turbulence or electrical noise .
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Power Supply | 5V DC |
| Power Current | <50mA (relay off) |
| Relay Rating | 250V AC @ 10A / 30V DC @ 10A |
| Number of Sensor Inputs | 5 (A, B, C, D, E) |
| Upper Tank Probes | 3 (High level, Low level, Common) |
| Lower Tank Probes | 2 (Low level, Common) |
| Control Logic | Active High (water completes circuit to Common) |
| Manual Override | Push-button Start (SW1) and Stop (SW2) |
| Debouncing | Capacitors C1, C2 for noise filtering |
| Indicators | Power LED (Red), Pump Status LED |
| Probe Material | Stainless steel recommended (not included) |
| Operating Temperature | -20°C to +70°C |
| Dimensions | Approx. 65mm × 50mm × 18mm |
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