The objectives of the community service activities in this scheme with the name of the Implementation of Appropriate Technology for air coolers are: First, to hone the skills of the youth. Second, Encouraging interest in youth talent in the field of technology. This service uses the service learning method which is one approach in teaching, combining academic goals and efforts to raise awareness in solving problems directly. With the socialization of making a simple Air Cooler using this Peltier, youth who are members of the Karang Taruna organization in Banjarsari Village can understand technology. In the implementation of this service, the response given by the youth of Banjarsari Village was very good with a percentage of 88.2% being satisfied. They were very enthusiastic in participating in these activities with the acquisition of 94.1% willing to immediately practice the results of service.

The objectives of the community service activities in this scheme with the name of the Implementation of Appropriate Technology for air coolers are: First, to hone the skills of the youth. Second, Encouraging interest in youth talent in the field of technology. This service uses the service learning method which is one approach in teaching, combining academic goals and efforts to raise awareness in solving problems directly. With the socialization of making a simple Air Cooler using this Peltier, youth who are members of the Karang Taruna organization in Banjarsari Village can understand technology. In the implementation of this service, the response given by the youth of Banjarsari Village was very good with a percentage of 88.2% being satisfied. They were very enthusiastic in participating in these activities with the acquisition of 94.1% willing to immediately practice the results of service.

Oyster mushroom is a type of food plant that is favored by many people, therefore many people cultivate oyster mushrooms to make a living because they see the large demand for oyster mushrooms, this problem is not matched by sophisticated tools in this cutting edge period. Farmers still use manual tools for mushroom treatment, by making a temperature and humidity monitoring system on mushroom kumbung, farmers can optimize crop yields, the monitoring system built is by installing a DHT 11 sensor around the mushroom kumbung, the sensor can be set by NodMCU and can measure the temperature and humidity in the oyster mushroom kumbung, the temperature and humidity settings are regulated by the NodeMCU which can later be displayed via the Smartphone, the conclusion of this monitoring system is increase the productivity of mushrooms produced by farmers.

These blind people still have difficulties in carrying out their activities, especially in terms of mobility in society. This is of course due to the lack of facilities and infrastructure that can support blind people in carrying out their daily activities. One of the assistive devices commonly used is a blind cane. With this stick, blind people are quite helped, especially when walking, but the conventional cane has limitations, one of which is the reach is too short. Thus, in this study, a concept for walking aids for blind people was developed by designing a new device that can cover the limitations of conventional canes. The tool is designed to utilize microcontroller technology with a minimum Arduino uno system, ultrasonic sensor HC-SR04, and DFPlayer Mp3 Mini module. The results showed that the designed tool can detect a maximum distance of 80 cm and can make a sound when the ultrasonic sensor is blocked.

Covid disease is a very dangerous disease because this disease is very easily transmitted to everyone, from the young to the elderly. With the conditions that are maintained and in this pandemic situation, many people underestimate how material the Covid 19 virus is. In designing this system simulation model, the devices used are in the form of a mini Arduino, pear sensor, battery, and buzzer. The method used to maintain a safe distance from people affected by Covid 19. In the form of research that can test how important it is for us to keep our distance from other people. With Arduino technology and pear sensors used to remind us that the distance between humans. So we have to be a bit oblivious when there is an output from the buzzer which has been warned by the pir sensor. With this tool, we can at least keep a distance from people around us