c:/winavr-20100110/bin/../lib/gcc/avr/4.3.3/../../../../avr/lib/avr51/crtm128.o:(.init9+0x0): undefined reference to `main' What does this error mean!!! ......
I like electronic things very much, but I have always been troubled by the resistance, capacitance, etc. of the peripheral circuit. I don't know how to choose and calculate. I am looking for informati...
[i=s]This post was last edited by boming on 2014-7-5 14:45[/i] Here are some unboxing photos for the first time. Exquisite packaging Anti-collision plastic bag added inside Rich supporting CDs and com...
I use a 149 chip and an 8M crystal oscillator. I can't adjust it with the source code in the previous post! ! !Has anyone done this before? ! ! !Please give me the source code. Thanks! ! !...
[backcolor=rgb(238, 238, 238)][size=14px]3G module(client, multiple) needs to connect to the server (one) network. The client needs to upload data information (heartbeat packet, battery power, GPS, al...
Abstract: Firstly, the characteristics of synthetic aperture radar (SAR) are introduced, and then the principle of synthetic aperture radar and the mechanism of . Since synthetic aperture radar can im...
In this article, the high-performance DSP developed by TI can be used as an effective confidentiality method if it is applied to PC encryption cards.
As an effective network security solution,...[Details]
In public places such as schools, government agencies, factories and mines, as well as public corridors in residential areas, the phenomenon of long-burning lights is very common, which causes a h...[Details]
1. What is temperature?
Heat is a type of molecular motion. The hotter an object is, the faster its molecules move. Absolute zero is defined as the temperature at which all molecular motion ...[Details]
Contact resistance
is the resistance to current flow through a closed pair of contacts. This type of measurement is performed on devices such as connectors,
relays
, and switches. The...[Details]
1 Introduction
Intelligent control instruments are one of the most commonly used controllers in industrial control. They are mainly aimed at a specific parameter (such as pressure, tempera...[Details]
1 Introduction to HART Protocol
HART (Highway Addressable Remote Transducer), an open communication protocol for addressable remote sensor high-speed channels, was launched by Rosemen in the U...[Details]
In today's body control module (BCM) designs, savvy engineers are moving away from electromechanical relays whenever possible. Their next step is to eliminate fuses. But is eliminating fuses a nece...[Details]
With the widespread application of new services and technologies in the communications industry, the scale and capacity of operators' network construction are getting larger and larger, and the ris...[Details]
Since the late 1990s, with the demand for higher system efficiency and lower power consumption, the technological update of telecommunications and data communication equipment has promoted the deve...[Details]
Currently, each country is developing its own USB interface
charging specifications
, which leads to a major problem that a USB interface
charging
device manufactured in one country...[Details]
At present, a large number of cooling tower fans, speed fans and special fans are in use in petroleum, chemical, pharmaceutical, metallurgical and other enterprises. Some fans have no monitoring in...[Details]
Our flight had just begun to descend when a gentleman sitting next to me turned to talk to me about engineering—he had seen me reading an engineering journal. The gentleman next to me said that he ...[Details]
Among the uses of electrical energy, lighting accounts for a considerable proportion. Compared with the earlier ordinary incandescent lamps, the fluorescent lamps and energy-saving lamps we commonl...[Details]
Movpower is a portable power bank. It can charge most mobile phones and digital products, such as digital cameras, PDAs, and mobile phones such as Apple, iPod, Blackberry, Motorola, Samsung, Nokia,...[Details]
1. The composition and structure of mobile phone lithium battery
Mobile phone lithium batteries are mainly composed of plastic shell upper and lower covers, lithium battery cells, protection c...[Details]
Microchip MCU
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