1.IntroductionArduino Due is an open source development board with 32-bit ARM core. Its pins are fully compatible with Arduino Mega2560. Atmel's ATSAM3X8E is used in the chip. Atmel preburns bootloader into ROM when it manufactures the chip. Arduino Due has 54 digital IO ports (12 can be used for PWM output), 12 analog input ports, 4 UART hardware serial ports, 84 MHz clock frequency, one USB OTG interface, two DAC (analog-to-digital conversion), two TWI, one power outlet, one SPI interface, one JTAG interface, one reset button and one erase button.2. Download program(1) Insert Arduino Due...
Time:
2019
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08
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06
Views:73
At present, it is found that Arduino version 1.8.5 or more needs to be set up when downloading programs.Next, take Arduino 1.8.5/Arduino 1.8.8/arduino 1.8.9 and Arduino 1.8.9 as examples.The development board connects the computer through the USB cable and checks the port number in the device manager. As shown in the figure.I. Take Arduino 1.8.5 as an exampleOpen the Arduino software and set up the tools, as shown in the figure.2. Take Arduino 1.8.8 as an exampleOpen the Arduino software and set up the tools, as shown in the figure.Note 1: The manufactured firmware versions of Arduino NANO are...
Time:
2019
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08
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06
Views:80
Prepare software:ST Visual Programmer1. Read Protection Settings:Click on Option byteClick on the ROP option and select Read Out Protection ONAfter the above changes, the chip can no longer be read!When burning HEX files, there will be read protection prompts.The tips are as follows: Read Out Protection ON in read protection stateThis operation is equivalent to the first level protection, and can also be used to turn off the read protection.If secondary protection is chosen: read-write protection, the chip will be locked completely.2. The methods of de-reading protection are as follows:Click o...
Time:
2019
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08
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06
Views:1558
LED照明灯具的驱动电源对变压器、电感器参数的要求十分高，为求精准需花费大量的人力和财力才能实现，工业化生产成本很难进一步下降。对LED驱动恒流源芯片设计技术的创新和突破，新的解决方案可以在LED灯具驱动电源实际应用时，输出电流对变压器和电感的电感量和LED的VF等参数不太敏感。创新技术的关键是优化芯片算法语言。芯片控制输出电流峰值，并通过辅助绕组反馈，使得退磁时间和芯片开关周期的比例固定，这样就可以使得输出电流与外围的电感量偏差和输出电压的偏差无关，而LED的VF值的偏差和电感偏差正是批量生产面临的最大的问题。来说，批量生产的变压器电感量和LED的VF都会有5~10%左右的偏差。而LED照明恒流驱动电源，批量精度可达3%以内，可以容许变压器和电感参数有较大的允差，这就降低了规模工业化生产的成本并促进流水线的持续快速生产
Time:
2019
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08
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06
Views:40
LED显示屏技术发展，客户对其认知度的加深，新客户对LED显示屏的稳定性、可靠性要求的越来越高。所以生产厂家为了符合要求，必须设计出更高可靠的LED显示屏。 目前，LED显示屏行业标准《LED显示屏通用规范SJ／T11141》，在这一行业标准和《电子测量仪2S可靠性试验GBll463》对LED显示屏进行可靠性测定试验，实际上很难实现MTBF不低于10000小时这一可靠性要求，更不能满足高可靠性LED显示屏的要求。而要做得具有高可靠性的LED显示屏，配套产品材料要有很大的提高，设计要求必须包括成热、合理、先进。 一、配套产品材料 1、LED发光管。 LED发光管是LED电子显示屏的关键器件，应采用目前成熟可靠的LED产品。产品特点： 定性好，离散性小。 ESD指标高：HBM大于4000V。 衰减幅度小：1000小时小于5％ 耐压能力强：Vr＝10V，Ir 亮度、波长、角度一致性高。 配光效果佳：完美的配光曲线。 可抵御温差、潮湿和紫外线，适用于户外环境。 2、箱体。整体采用钢板或铝材，采用开门结构。箱体顶部采用销钉和底部采用导向套，保证箱体间...
Time:
2019
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08
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06
Views:29