Assoc. Prof. Dr. Supachai Tragoonsubtavee and Asst. Prof. Dr. Sathaphon Wangchai, lecturers of  Department of Materials Handling and Logistics Engineering, Faculty of Engineering, launched an innovation to aid in the disinfection attempts. This robotic disinfection sprayer can effectively clean the high-touch surfaces and eliminate viruses.  With its capacity to generate a fog droplet with an average of 50 micron, this robot is based on the system called ULV cold fog generator. It works through the 12 bar high pressure washer with a flow rate of 1 liter per a minute, and 16 sprayers with a capacity to generate extraordinary small droplets, including the 8 circular sprayers and 8 high pressure blower sprayers. Due to its size of 50 micron, the sprayed disinfectant will exist in the air longer and can be moved around 5 - 7 metres by the pressure and high flow rate of the air, so the disinfectant will fill the area. It has been found that the density of sprayed disinfectant is consistent in all areas and it can continually generate the droplet for three hours with the same effectivity. According to the experiment, the robot can spray the disinfectant in the area of 37,680 square metres within 50 minutes. Therefore, it can save time and protect the workers who use to spray the disinfectant in the high risk area from the risk of contracting disease.
 
This ULV robot is designed to be controlled by the wireless system in order to increase the convenience of the user and to distance the user from the working area of the fog generator. The user can control the robot via a camera and radio established on the robot, so it is a lot easier to control the robot and the angle can be adjusted over 120° to suit with the area of operation. The robot has a width dimension 60 centimetres, a length dimension of 80 centimetres and a height of 150 centimetres. Moreover, the robot is built from stainless which is highly tolerable to humidity, and it was built by the amount of 70,000 bath supported by the KMUTNB’s fund for the university’s development and endeavor to fight COVID-19.
 
Prof. Dr.-Ing. habil. Suchart Siengchin, KMUTNB President, expressed his concerns about the third wave of the coronavirus 2019 spread as it was found that the number of deaths is close to that of the second wave. Thus, KMUTNB wishes to support the attempt to fight COVID-19 with the robotic disinfection sprayer which can be used to prevent the spread of COVID-19, as it can eliminate viruses by generation fog of disinfectant in the shared surfaces of high risk areas, such as the hospitals, offices or public areas. This can increase the safety of the relevant parties, because the robot can replace the staff in spraying disinfectant and be controlled from the distant area. 
 
Assoc. Prof. Dr. Supachai Tragoonsubtavee stated that the purpose of this ULV robot is to aid in disinfection the high risk area and is among innovations created for preventing the spread of coronavirus 2019. It is designed to be a robot controlled by a wireless system which will carry the disinfectant and spray it in the risk area. This is one among the university’s effort to apply technology for the benefits of the society and promote the well-being of the people. This innovation is emphasized to be used in the public transportation, temples, nurseries, schools, colleges, markets, departments stores, theaters, and etc.
 
The ULV robot for spraying droplets of disinfectant is very helpful in cleaning the high risk area during the spread of COVID-19. Provided the power by two pieces of 55 ah batteries, the robot can operate unceasingly for 150 minutes, together with a high speed fan and a camera to transfer the picture to the controller. The technology that the robot is based on are as follows:
 

 
 
Asst. Prof. Dr. Sathaphon Wangchai stated that, beside the control circuit to ensure the safety of the releasing of DC power, the electrical system of the robot can be categorized as follows: 1)  the joy controller being used as a transmitter will receive an order from the user, and it consists of a control switch, a transmitter of radio signal, and a camera. The transmitter will receive an order from a bottom press by a user and will be transmitted to the robot via the radio signal. 2) The transmitter comprises of the receiver of radio signal which will transfer information from radio to micro controller, then the micro controller will investigate the received information and then transmit a signal to a motor control board. The motor can be divided into three parts, including an in-wheel motor, a motor for rotating the nozzle, a motor installed in the sprayer which can be adjusted the speed and wind pressure ti suit with the environment. 
 
Presently, the ULV robot to aid in disinfection has been tested and used to spray disinfectant droplets in the university, such as a conference room, sport field, offices and canteens. This innovation will contribute to promote the safety of staff involved in the cleaning of the high areas and prevent the spread of coronavirus 2019.