IMPLEMENTATION OF PCB, CASING DESIGN AND BATTERY SIZE ADJUSTMENT ON HEART RATE MONITORING DEVICE

• Main Author: Tegar Azkiya, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74175
• Institution: Institut Teknologi Bandung

PCB and casing are important elements in creating a product. This is done to meet social constraints in terms of comfort when used, ensuring that the product pays attention to aesthetic values such as having a good design and supporting the user's appearance. Initially, the PCB and casing design would be created from scratch, meeting dimensional specifications of a maximum size of 50 x 50 x 40 mm and in a rectangular shape. However, due to the author's limitations and time constraints, the PCB and casing were only made for the data acquisition system, which consists of sensors. For other systems such as communication, control, input, and output, a development board called a deauther watch will be used. This watch is a simulation board that can be developed to learn about Wi-Fi, microcontrollers, Arduino, hacking, and electronics/programming in general. The PCB and casing will be connected to the deauther watch, adjusting their size accordingly and still considering the specific aspects. The dimensions of the deauther watch are 50 x 40 x 20 mm, so the PCB design and casing should not exceed a height of 20 mm, while the length and width will be planned to fit the deauther watch. The deauther watch has a rectangular shape, which already complies with the planned product specifications. The deauther watch already has a built-in battery, but it only lasts for 4 hours, while the product's required specification is to work for up to 5 hours. Additionally, the addition of sensor components increases battery consumption, necessitating a larger battery capacity to meet the specifications. Furthermore, the size of the battery must be considered since it will be inserted into the fixed-sized deauther watch. Considering the size of the deauther watch, which is 50 x 40 x 20 mm, and the sizes of other electrical components inside it, the battery size should not exceed 10 mm less than the size of the watch, which is 40 x 30 x 10 mm. The PCB design is created using Altium Designer software. This application has comprehensive features and provides numerous electronic component materials for PCB manufacturing. Meanwhile, the casing design is done using Fusion 360 software. This application of ers various printing format options and has many resources for designing shapes. The PCB and casing were successfully printed perfectly, resulting in a final product with a rectangular shape and dimensions below the maximum target dimensions allowed. The casing is made of PLA IV material and has a gray color. This material is relatively sturdy and easy to print. The battery component calculation is done by summing up the load of each component used, which is obtained by multiplying the voltage and current of each component. However, for the deauther watch specifically, the load is calculated by dividing the existing capacity by the long operating time and then multiplying it by the battery voltage. The total load is then divided by the battery voltage again and multiplied by the desired operating time. It was determined that the battery requirement is 880 mAh for a 5-hour operating time, but there is no battery with that capacity that fits the target size. Therefore, a slightly smaller capacity of 800 mAh was chosen. As a result, the battery can fit inside the deauther watch, and the achieved operating time is 5 hours and 32 minutes.