As a simplified version of AT89C51, AT89C2051 removes P0, P2 and other ports, reducing the number of I/O ports. However, it adds a voltage comparator, so its functions are enhanced in some aspects. For example, it can be used to process analog Quantity, simple analog-to-digital conversion, etc. This article uses this function to design a digital capacitance meter, which can measure the capacity of capacitors with a capacity less than 2 microfarads. It uses a 3-and-a-half-digit digital display. The maximum display value is 1999. The reading unit is uniformly nanofarads (nf), and the measuring range is divided into In the fourth gear, the readings are multiplied by the corresponding magnification.
This solution is a flow measurement instrument that can be used to measure gas flow at home or in industry, and provides flow measurement, LCD display, real-time clock, data storage, automatic remote meter reading through RS-485, M-Bus instrument bus, wireless communication, Advantages include strong anti-interference ability and optimal reliability.
Want to add lots of LEDs to your Arduino project? HUB75 RGB panels are a great way to do this as they are much cheaper than addressable Neopixel/WS2812 LEDs (typically 10% of the cost per LED). They are also available in a range of pixel densities (from 2mm to 10mm pitch) to better suit your project needs. However, using a microcontroller to display high-quality graphics on a HUB75 panel is complicated because the panel requires precise timing and constant refreshing of pixel data. That's where Teensy 4's SmartLED Shield comes in.
The PCA9745B evaluation board features LEDs for color mixing, blinking and dimming demonstrations. The graphical interface allows users to easily explore the different features of the driver. This board can be connected in series with other SPI bus demonstration boards to create an evaluation system. The IC communicates with the host through the industry-standard SPI bus port. The evaluation software runs on the Microsoft Windows PC platform.
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