DIY Sanitation Disinfection Tunnel Circuit
Learn to build a DIY sanitation disinfection tunnel circuit for hand and body sanitization using sensors, relays, and spray mechanisms. Step-by-step tutorial included.
What Is a Sanitation Disinfection Tunnel?
A sanitation disinfection tunnel is a walking or entry tunnel that has disinfectant sprays installed, such that people or things are automatically sanitized. It assists in minimizing on-surface contamination and airborne pathogens, thereby making the surroundings safer.
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An innovative project is a DIY Sanitation Disinfection Tunnel Circuit, which is proposed to increase the level of hygiene by automatically disinfecting people or objects that pass through a tunnel. Such tunnels gained popularity, especially when there was a health crisis, to curb the transmission of germs and viruses.
This is a self-built project that involves motion sensors that are used to energize a relay that operates a pump to spray disinfectant solution. The system may have variable timing, uniform spray cover nozzles, and a mechanism to prevent saturation as well as exposure to chemicals. In constructing a DIY sanitation disinfection tunnel circuit, you will not only learn to make a practical solution to sanitize, but also get an opportunity to learn other practical electronics, such as sensors, relays, and timer circuits. The project is applicable in schools, offices, and other public places and workshops where hygiene is paramount.
Features of TL431-Based Charger Circuit
High Precision Voltage Regulation
- TL431 provides a 2.5V reference voltage that can be amplified using a resistor network to achieve a precise output voltage for charging.
- Ensures stable constant voltage during the charging process.
Auto Cut-Off Function
- Automatically stops charging when battery voltage reaches the pre-set limit.
- Prevents overcharging and prolongs battery lifespan.
Supports 1S and 2S Li-ion Batteries
- Can charge single or dual-cell packs.
- Easily adjustable by resistor selection in the TL431 network.
Components Needed
TL431 Shunt Regulator
- Acts as a precision voltage reference and comparator for the cut-off function.
MOSFET or Transistor
- Used as a switching device to control current flow to the battery.
- Recommended: IRF540N, 2N7000, or similar low-voltage MOSFETs.
Resistors and Capacitors
- Set charging voltage and current limits.
- Filter capacitors reduce voltage ripples.
Battery Connectors
- Connect the battery safely to the circuit using proper polarity connectors.
Optional LED Indicators
- Red LED for charging
- Green LED for full battery
Working Principle of the Charger Circuit
Constant Voltage Charging
When the battery is connected, the circuit regulates current initially, then maintains a constant voltage until the The battery is nearly full.
Auto Cut-Off Mechanism
- TL431 monitors battery voltage.
- When voltage reaches the pre-set cut-off (e.g., 4.2V per cell), TL431 turns off the MOSFET, stopping the current flow.
Step-by-Step Circuit Assembly
Preparing the Power Source
- Use a DC adapter that can provide 5–6V for 1S or 8–9V for 2S with current limit according to battery capacity.
Connecting TL431 and MOSFET
- Connect TL431 reference input via resistor divider to battery terminals.
- MOSFET drain/source controls the charging path.
Setting the Cut-Off Voltage
- Adjust resistor values to achieve 4.2V per cell at the TL431 feedback pin.
- Measure with a multimeter before connecting the battery.
Testing the Charger Circuit
- Connect a dummy load or test battery.
- Measure charging voltage and current.
- Verify auto cut-off functionality at full charge.
Applications of 3.7V Battery Charger Circuits
- DIY battery packs
- Portable electronics
- Power banks
- Small robotic devices
- Rechargeable LED lights
Safety Precautions
- Always verify battery polarity before connecting.
- Do not exceed the recommended current or voltage.
- Use fuses or PTC resettable fuses for safety.
- Avoid charging unattended.
- Ensure good ventilation to prevent overheating.
Troubleshooting Common Issues
- Battery not charging: Check power source and MOSFET connections.
- LED indicator not working: Verify LED orientation and resistor values.
- Battery overcharges: Recheck TL431 voltage divider values.
Frequently Asked Questions - DIY Sanitation Disinfection Tunnel Circuit:
What is a DIY sanitation disinfection tunnel?
A walk-through tunnel that sprays disinfectant automatically using sensors and a pump.
Which sensors are suitable for detection?
IR sensors or ultrasonic sensors are commonly used to detect human presence.
How is the spray duration controlled?
Using a 555 timer or microcontroller to trigger the relay for a fixed duration.
What type of disinfectant should be used?
Non-toxic, water-based disinfectants approved for public use.
Can the circuit work with a 12V pump?
Yes, as long as the power supply matches the pump and relay voltage.
How many nozzles are recommended?
Typically 4–6 nozzles positioned for uniform coverage.
Is the tunnel safe for children?
Yes, if non-toxic disinfectant is used and electrical components are insulated.
Can the tunnel handle continuous use?
Yes, ensure pump and relay are rated for repeated cycles.
Can the timer duration be adjusted?
Yes, by changing the resistor/capacitor values in the 555 timer circuit.
Can multiple tunnels be connected to a single control circuit?
Yes, with proper relay ratings and power supply design.
