The purpose of this paper is to show the use of video tracker to analyze circular motion. Measurement of circular motion such as angular velocity and angular acceleration is not easy to do observation and measurement directly. Through the video tracker tool, the analysis of speed and rotation acceleration becomes easier. The rotating object used as a research object is a spinner fidget. The initial velocity of the rotation depends on the pull of the finger on the spinner. The duration of rotating spinner fidget depends on the inertia and attenuation that occurs. Camera position and resolution of the camera greatly determine the data on the video tracker. The standard camera capability of 30 frames per second is less capable of capturing objects that rotate with high resolution.

The public street light used to create good conditions for road users. The public street lamps must continue to be maintained to keep working properly. Currently, maintenance of street lighting is still done manually. In this research, a system was designed and implemented to detect lamp damage and control lights remotely using the WeMos D1 microcontroller. This system uses two LDRs as light sensors and relays to activate the lights. The first LDR is used to detect ambient light. The second LDR is used to detect lamp conditions. Light control and detection use wireless internet networks and WeMoS D1 as the web server. The system can turn on and turn off the lights automatically, detect the condition of the lamps, and show the intensity of the light environment. Distance to control via a wifi hotspot using a computer is 72m and 20m for a mobile phone.

The PLC is widely used as a controller with input in the form of switches and sensors and output in the form of coils. PLC can be connected with HMI to facilitate the operation of the PLC. The usual HMI is installed on a PLC in the form of a stand-alone PC HMI and HMI that is connected via serial cable or Ethernet cable. The HMI in the form of wireless is rarely found. In this paper, will show the use of HMI connected with Bluetooth (BT) on the Outseal PLC (locally made PLC). The PLC is programmed with standard ladder diagram. Selector 4 channels with input in the form of switches and output in the form of coils (lights). Lights can be selected via the switch. Difficulties in the PLC with input using the switch are not easily changed from afar. HMI designed has facilities available for ALL OFF, ALL ON and TOGGLE mode. The HMI uses a smart phone with HMI modbus apk for android. The Smart phone screen can be used as a monitor and is a touch screen for input. Screen size of 5.5 inch, pixel size of 720 1280 is capable of displaying 7 switches and 4 indicators INTRODUCTIONThe PLC is widely used for controllers in industry. The simplest PLC unit is a CPU with an input in the form of a switch and an output in the form of a coil. To display and control the PLC used HMI (Human Machine Interface) which is in the form of a touch screen. On the HMI screen can be filled with input and display devices. The widely available HMIs are PC monitor screens as HMIs and dedicated HMIs. HMI communication can be done using serial communication via an attached cable Problem to solve in this paper: Selector 4 channels of relays starting all the OFF condition. The channel can be controlled ON or OFF directly using the switch. There is an option to change the Indi dually channel into ON of OFF condition. The other option is to change all condition into ON condition. The next option is all OFF and the reverse choice from the original state using remote access. THE THEORETICAL BACKGROUNDThe Outseal PLC is an Arduino-based PLC that has been loaded with a special boat loader [1]. The PLC input part that is connected to the outside world is S1 to S8, while the output part is connected via the relay coil R1 to R8. There is a memory bit with names B1 through B128. Input ports and output ports can be expanded up to 128 ports Modbus protocol is a protocol for communication on PLC with other equipment such as HMI [2]. Modbus communication between master and slave can be via serial cable (modbus RTU) or TCP / IP (modbus TCP / IP).

In general, PLCs has digital inputs and outputs system. The PLC additional system for analog input on the PLC is limited to sensor output in the form of a voltage of 1-5V (or 4mA to 20mA current). The development of I2C-based sensor technology is not suitable for PLCs. In this research, an I2C-based sensors system was designed and made that can be connected to the PLC. Data from the I2C sensor is sent to the DM memory in the PLC via RS232 serial communication. The sensor used was an LDR as a light sensor and a BMP180 sensor to measure atmospheric pressure and room temperature. From the experiment, the results of the LDR sensor were 100% successful and the data transmission from the BMP180 sensor was well recognized

Mathematics and Physics are subjects that are not only difficult for students but also difficult for teachers. To make it easier to understand the material, Geogebra software is used. In this community service, Geogebra training was provided for high school teachers who are Mathematics and Physics teachers in West Kalimantan. The training was conducted online involving 10 lecturers and 5 assistants. The training consisted of 4 sessions carried out over 2 days which was attended by 31 teachers of Mathematics and Physics. The training is divided into 2 classes to be more effective. From the training results, there was an increase in the ability to use Geogebra by 38.05%. The average level of participant satisfaction with the implementation of the study is 4.15 on (a scale of 5)