This video evaluates the feasibility and performance of building a DIY Bluetooth Low Energy (BLE) smart tag as a cost-effective alternative to commercial tracking devices. The creator begins by analyzing a commercial Galaxy Smart Tag, demonstrating its functionality (locating misplaced items, 25m range) and measuring its ultra-low power consumption (e.g., 15.44 µA idle). For the DIY attempt, a Nordic NRF52840 System-on-Chip is selected, and a custom, coin-sized PCB is designed incorporating power-saving components like a DC-DC converter and an external crystal, along with an external antenna. While the DIY prototype successfully functions as a BLE beacon, subsequent tests reveal it draws significantly more current than the commercial tag and achieves a much shorter detection range of only 5 meters, primarily due to an incorrectly designed antenna. The video concludes that, despite component cost considerations, the commercial "buy" option offers superior features, performance (battery life, range), and overall polish, making it the clear winner when factoring in development time and the provided functionality.
Summarizing the DIY vs. Buy BLE Smart Tag Challenge
0:00:04 The video introduces BLE smart tags, like those found in credit cards or keychains, which help locate misplaced items using a smartphone app and typically offer a range of up to 25 meters, but can be expensive if multiple tags are needed.
0:00:54 The creator aims to build a DIY version that is cheaper and potentially better in terms of battery runtime and detection range, initiating a "DIY or Buy" challenge.
0:02:12 It's noted that commercial tags offer advanced features, such as GPS position sharing via other Galaxy smartphones and Ultra Wideband (UWB) for directional guidance, which are beyond the scope of this BLE-focused DIY project.
0:03:01 Bluetooth Low Energy (BLE) is explained as differing from traditional Bluetooth by periodically broadcasting data and allowing the microcontroller to enter a low-power sleep mode, leading to extended battery life (advertised up to 500 days).
0:03:51 A commercial Galaxy Smart Tag is analyzed, with power measurements showing extremely low current draws: 15.44 microamps (µA) idle, 70 µA when connected, and 5.1 milliamps (mA) while buzzing, setting a benchmark for the DIY attempt.
0:04:49 For the DIY build, the Nordic NRF52840 System-on-Chip (SOC) is chosen due to its popularity and promising low-power specifications, as the commercial tag's Atmos ATM3325 SOC is not available to hobbyists.
0:07:06 A custom, coin-cell-sized PCB is designed, incorporating the NRF52840, a DC-DC converter for efficiency, an external crystal for a real-time clock, and an external antenna.
0:08:47 After facing some programming and assembly challenges, one of the three DIY prototype boards successfully functions as a BLE beacon.
0:09:51 Current consumption tests of the DIY beacon reveal it draws significantly more current than the commercial version, indicating the commercial product is superior in power efficiency.
0:10:10 A range test for the DIY beacon yields a detection distance of only 5 meters, substantially less than the commercial tag, which the creator attributes to an incorrectly designed antenna.
0:10:27Key Takeaway: The video concludes that the commercial "buy" option is the clear winner, offering a more polished product with better features, superior battery life, and a greater detection range, especially when considering the significant time investment required for the DIY build.