8/16/2023 0 Comments Uvc sterilizer box![]() Just like a mouse, the rotary encoder can be rotated and clicked (pressed). The most common rotary encoder is the scroll wheel on a computer mouse. It does not give any absolute value but can be interpreted to give the direction of motion, and the pulses generated can be counted to give the new value. Though it looks like an analogue potentiometer, it is a digital device that can be fully rotated without any end stops. The software sketch can be downloaded from EFY website and uploaded to the Arduino using the Arduino IDE.Ī rotary encoder is used for setting time-period. It comprises a TM1637 module, 5V DC power supply module (Module1), Arduino Nano (Board1), 5V single-changeover relay (RL1), a rotary switch, a magnetic door switch, two 230V AC operated UV tubes, two chokes, and a few other components. Circuit diagram of the UV sterilisation box is shown in Fig. Arduino Pro can be used, which has a small footprint, though any Arduino variant would work. The controller is built around an Arduino. 3: Installation of the two chokes Circuit and working Draw the end wires connected to the tubes outside the top of the box where the two chokes are installed as shown in Fig. Install the two 11W UV tubes on ceiling of the box using ties. The outer side of the box can also be covered with craft paper. Stick kitchen aluminium foil or silver craft paper on all inner sides of the box so that the UV light scatters all over inside the box. ![]() A thin iron strip (such as a piece of an old hacksaw) may be attached to the side edge of the box to which the magnets can stick. On the opposite edge three neodymium magnets can be embedded inside the cardboard to serve as a secure lock for the door. 2: Opening on the front side of UV steriliser boxĪ hinge can be made on one edge by cutting a 3cm strip from the door and sticking it again with a sturdy tape or a cloth strip. The door can be built using a cardboard sheet that is at least 2cm bigger than the opening to block the UV light properly. A 3cm edge (frame) was left on all sides of the opening so that the door could rest (close) along these edges. The top of the box was sealed and fixed while a slot was cut on the front side of the box as shown in Fig. 1: Author’s prototype for UV steriliser box (Direct exposure to UV-C rays is harmful to humans, so build a proper enclosure.) The author’s prototype was built using an empty printer box as shown in Fig. The UV steriliser can be made using a suitable-size stiff cardboard or wooden box, or any other sturdy box. Safety feature that shuts off the UV lamp if the door/lid of the box is opened.Display showing remaining time and alert messages.Simple operation using Start/Resume and Stop/Pause buttons.Rotary switch for setting exposure time from 1 to 10 minutes.Magnetic hold of door/lid to keep it securely closed.Reflective sides for maximising reflections and giving effective 360-degree coverage.UV-C lamps operating at 254nm wavelength for effective germicidal effect.In the prototype, we have used two 11-watt germicidal UV tubes along with their chokes. UV-C LEDs that generate light at wavelengths between 255 and 280nm are also available. Germicidal UV-C is commonly generated using low-pressure mercury vapour lamps, which emit light at 253.7nm. It is therefore necessary that sufficient UV-C light reaches all parts of the object being disinfected. The effectiveness of this germicidal exposure depends on the duration of exposure and the intensity and wavelength of the UV radiation. UV-C disrupts the DNA of pathogens and impairs their ability to perform vital cellular functions. The wide range of UV radiation is grouped into three main categories:Īcross the world, UV-C sterilisation is an established method for inactivating pathogens, viruses, and bacteria. ![]() It has shorter wavelength than visible light but longer than x-rays. Ultraviolet is electromagnetic radiation with wavelength of 10 to 400nm. Due to coronavirus we are now used to alcohol based sanitisation liquids and sprays but what about disinfecting items like goggles, keys, mobile phone, watch, currency notes, laptop, courier packets, etc that we handle? A convenient solution for disinfecting such items is an ultraviolet (UV) sterilisation box that you can build yourself.
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