The Raspberry Pi 3B+ is a low-cost, single-board computer equipped with a Broadcom BCM2837B0 system-on-chip and an onboard BCM43455 Wi-Fi chipset, making it a compact and accessible platform for embedded computing and wireless experimentation. In the context of Wi-Fi CSI sensing research, it is particularly significant because its Broadcom Wi-Fi chip is compatible with the nexmon CSI Extractor Tool, enabling per-frame CSI extraction directly from consumer-grade hardware without specialized network interface cards. This accessibility has made the Raspberry Pi 3B+ a widely adopted platform for deploying and evaluating CSI-based sensing systems — such as crowd counting — in real-world indoor environments, bridging the gap between laboratory-grade research and practical, low-cost deployment.
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