Currently, various technologies are involved with automotive, especially cars. Most of the inventions in vehicle technologies are focused on vehicle performance and safety on the road, intending to reduce the number of accidents involving the vehicle. However, throughout the years, incidents involving death due to heatstroke of humans particularly children left in the vehicle are frequently reported. Thus, a human presence detector in vehicle is proposed in this work. Multiple sensors operating with Arduino as main controller are presented. The system will automatically operate once the vehicle key is absent, where the sensors will detect based on the weight sensor, any movement or sound inside the vehicle and then it will notify the user and people in the surroundings. The system has been successfully designed and tested with low-cost material to encourage its installment on almost any type of vehicle.