A vital part of the drivetrain subsystems for fuel-cell electric vehicles is the fuel-cell control unit (FCCU). This unit is in charge of overall process control for the complete fuel-cell system. This entails managing thermal and water resources, managing the processing of hydrogen and air, converting energy, and adhering to all safety and security regulations. The fuel-cell controller and the powertrain domain controller must communicate frequently in order to guarantee that these load and heat criteria are consistently met. For the fuel cell to provide the required quantity of electrical power, the linked system components, such as the hydrogen gas injector, electric air compressor, recirculation pump, sensors, etc., are precisely controlled and monitored by the FCCU. With VAct customized STM32F405 development boards, it is possible to implement the control system for monitoring and enhancing the performance of Fuel Cell Electric Vehicles. Some of the critical parameters of a cell voltage monitoring system are the sampling rate and real-time communication interface. The STM32F405 has two CAN interfaces that meet the communication requirement for a cell voltage monitoring system.