In my experience working with low-cost microcontrollers, devices priced under 0.1 USD like the Yingguang PMS150G are perfect for simple and efficient embedded systems. These 8-bit OTP MCUs come with features such as 16-bit timers, 8-bit PWM, and multiple I/O ports with built-in pull-up/down resistors, making them extremely versatile for small projects. For example, I used a PMS150G MCU to build a compact temperature display unit. Its low power consumption helped extend battery life, while the high integration reduced component count and size. The internal memory and OTP storage simplified programming and deployment for a cost-effective prototype. Additionally, these microcontrollers are well-suited for applications like colorful LED lighting effects (幻彩灯) and basic radar sensing modules, where budget and size constraints are critical. Their simplicity also means the learning curve is gentle for hobbyists and beginners looking to experiment with microcontroller-based designs without heavy investment. On the downside, these low-end MCUs are limited in processing power and memory, but for tasks such as simple control systems, sensor interfacing, or feedback displays, they offer a perfect balance between performance and affordability. If you're considering a project that requires a basic microcontroller with a tight cost budget, exploring models like the Yingguang PMS150G could be a smart choice.