DIY Sanitation Disinfection Tunnel Circuit | Full Guide

Why Build a DIY Sanitation Tunnel Circuit?

• Cost-Effective: Less expensive than commercial units.
• Customizable: Adjust spray duration, timer, and nozzle placement.
• Hands-Free Operation: Reduces human contact with potentially contaminated surfaces.
• Educational: Learn about sensors, relays, timers, and fluid mechanics.
• Portable Design: Can be installed in offices, entrances, or event venues.

Components Required for DIY Disinfection Tunnel

Working Principle of the Disinfection Tunnel Circuit

• Detection Stage: Sensors detect a person or object entering the tunnel.
• Activation Stage: Sensor output triggers a relay connected to the pump.
• Disinfection Stage: Pump sprays disinfectant through nozzles for preset duration.
• Delay / Timer Control: Timer ensures controlled spray and prevents continuous operation.
• Safety and Reset: Circuit resets automatically for the next user.

Circuit Diagram Explanation

• Sensor Output → Connected to timer input or microcontroller pin.
• Timer / Controller → Sets spray duration (1–5 seconds typical).
• Relay Coil → Activated by timer to switch the pump ON.
• Pump → Dispenses disinfectant through multiple nozzles.
• Power Supply → Provides regulated DC voltage for sensor, relay, and pump.

Step-by-Step Construction Guide

1. Build Tunnel Frame: Use PVC or lightweight metal for a walk-through frame.
2. Install Nozzles: Place at shoulder and torso level for uniform coverage.
3. Mount Sensors: Install IR or ultrasonic sensors at the entrance to detect individuals.
4. Assemble Circuit: Connect sensors, relay, timer, and pump according to the diagram.
5. Connect Power Supply: Ensure proper voltage and current rating for pump and relay.
6. Test Spray Operation: Walk through the tunnel to verify detection and spray timing. Adjust timer and sensor sensitivity.

Safety Considerations

• Use non-toxic, approved disinfectants.
• Avoid over-saturating clothes or skin.
• Place the tunnel in a well-ventilated area.
• Ensure electrical connections are insulated and waterproof.
• Keep children and pets away during operation.

Applications of Disinfection Tunnel

• Hospital entrances
• Offices and schools
• Event venues and malls
• Factory and workshop entry points
• Public transportation hubs

Troubleshooting Tips

• Pump not activating → Check relay coil voltage and connections.
• Sensor not detecting → Adjust sensor distance or orientation.
• Continuous spray → Check timer circuit and relay reset.
• Uneven spray coverage → Reposition nozzles or increase number of nozzles.
• Low disinfectant flow → Check tubing, pump, and solution level.