The electronic scale is mainly controlled by the single-chip microcomputer STC90C52RC core to realize the basic control functions of the electronic scale. The system expands the electronic calendar clock. The system can be divided into six parts: small system, data acquisition, human-computer interaction interface and system power supply, clock and voice reporting. The system part mainly includes STC90C52RC and classic reset circuit; the data acquisition part is composed of weighing sensor, signal amplification and A/D conversion part, and the signal amplification and A/D conversion part are mainly realized by the dedicated high-precision 24-bit AD conversion chip HX711. The human-computer interaction interface is keyboard input and dot matrix LCD display, mainly using 4*4 matrix keyboard and 1602 LCD display, which can conveniently input data and intuitively display data. The electronic scale can realize basic weighing functions (weighing range is 0-3K, weight error is not more than ±0.005Kg), and expands the functions of clock and voice reporting. The clock module can also set the alarm function. The system also has an over-range alarm function when weighing. Colour:As Shown Material:plastic Due to different product batches, the appearance , which does not affect the use Package Contents: 1 x Microcontroller Electronic Scale DIY Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.