➀ China's automotive chip self-sufficiency rate is alarmingly low, below 10%, with major suppliers being foreign companies like NVIDIA, Qualcomm, and Intel. ➁ The government is pushing for a 25% domestic chip usage rate by 2024, with potential policy adjustments for non-compliance. ➂ Despite Huawei's efforts, challenges in chip production and ecosystem development mean that NVIDIA's 'crippled' H20 chips are still preferred by Chinese tech giants due to superior performance in practical applications and established software ecosystems.

1. Discuss the application of Raspberry Pi 4 in enhancing building security; 2. Explore the cost-effective solution for managing access points in multi-dwelling communities; 3. Highlight the reliability and efficiency of using Raspberry Pi 4 for security purposes.