Monitoring is a system for obtaining information whether in real time or not. Monitoring can be carried out in various forms ranging from scientific data. cause and effect and others. This time the author uses a monitoring system to monitor the source voltage, current and rotation speed. This tool is designed using two microcontrollers, namely Arduino UNO which is used as a controller system and LCD which is used to display voltage and current values. The design of this tool aims to monitor the charging of the accumulator from the VDC generator. Then the value of the charge will be displayed using the LCD. The results of the tests that have been carried out show that each component used in this monitoring system works well, as evidenced by the results of measurements using graphs with average values of voltage 15.26, current 1.36, and RPM (Rotation Per Minute) 553 /minute. Then the voltage sensor reads the voltage value on the VDC generator in charging condition so that this monitoring system can work as it should.