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Description: IA4420 工作在315/433/868/915MHz 频段（IA4421 工作在433/868/915MHz 频段）；
2． 低电压工作，工作电压2.2V~5.4V；
3． 低功耗模式，待机电流0.3uA；
4． 调制模式FSK，并具备高度集成的PLL；
5． 低发射功率、高接收灵敏度设计，发射功率5~10 dbm 可调，接收灵敏度-109 dbm；
6． 内置时钟输出，可省掉MCU 的晶振；
7． 传输数据率高，数字信号可达115.2 kbit/s,模拟信号可达256 kbit/s；
8． 发射频偏与接收带宽可调；
9． 内部有数字滤波器，并可以根据要求选择不同的方式；
10． SPI 的控制接口，方便使用；
11． 接收时有数据同步码识别器，系统检测同步码后将后面的数据输出；
12． 有16 位的收发缓存器，用来缓存接收到或要发送的数据（接收数据有两种方式，用户可以按需选择）；
13． 有低电压检测器，从2.2-5.4V 可调；
14． 有定时唤醒功能，定时时间可达几天；
15． 天线的兼容性强，有天线自动调节功能，并可采用PCB 或外置天线；
16． 工作温度范围-40~85，储存温度范围-55~125℃；
17． 采用微小TSSOP16 封装。
-315/433/868/915MHz IA4420 work in the band (IA4421 Working in 433 / 868/915MHz band); 2. Low-voltage, voltage 2.2 V ~ 5.4V; 3. Low-power mode, standby current 0.3 uA 169 * 85 *; 4. FSK modulation mode, and highly integrated PLL; 5. Low emission power and high receiver sensitivity, launched power 5 ~ 10 dbm adjustable, -109 dbm receiver sensitivity; 6. Built-in clock output can be saved MCU resonator; 7. Higher data transmission rate, digital signal of up to 115.2 kbit / s, analog signal up to 256 kbit / s; 8. Emission Offset and receiving adjustable bandwidth; 9. Internal digital filters, and may request to have a choice of different ways; 10. SPI control interface, and ease of use; 11. When receiving data synchronization code identifier, the system will detect synchronous code behind the
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Size: 39433 |
Author: songxiaoyan2008 |
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Description: 用jubilder开发的一个数据库管理程序-jubilder developed with a database management procedures
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Size: 29434 |
Author: 路亚奇 |
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Description: 用jubilder开发的一个数据库管理程序-jubilder developed with a database management procedures
Platform: |
Size: 28672 |
Author: 路亚奇 |
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Description: IA4420 工作在315/433/868/915MHz 频段（IA4421 工作在433/868/915MHz 频段）；
2． 低电压工作，工作电压2.2V~5.4V；
3． 低功耗模式，待机电流0.3uA；
4． 调制模式FSK，并具备高度集成的PLL；
5． 低发射功率、高接收灵敏度设计，发射功率5~10 dbm 可调，接收灵敏度-109 dbm；
6． 内置时钟输出，可省掉MCU 的晶振；
7． 传输数据率高，数字信号可达115.2 kbit/s,模拟信号可达256 kbit/s；
8． 发射频偏与接收带宽可调；
9． 内部有数字滤波器，并可以根据要求选择不同的方式；
10． SPI 的控制接口，方便使用；
11． 接收时有数据同步码识别器，系统检测同步码后将后面的数据输出；
12． 有16 位的收发缓存器，用来缓存接收到或要发送的数据（接收数据有两种方式，用户可以按需选择）；
13． 有低电压检测器，从2.2-5.4V 可调；
14． 有定时唤醒功能，定时时间可达几天；
15． 天线的兼容性强，有天线自动调节功能，并可采用PCB 或外置天线；
16． 工作温度范围-40~85，储存温度范围-55~125℃；
17． 采用微小TSSOP16 封装。
-315/433/868/915MHz IA4420 work in the band (IA4421 Working in 433/868/915MHz band); 2. Low-voltage, voltage 2.2 V ~ 5.4V; 3. Low-power mode, standby current 0.3 uA 169* 85*; 4. FSK modulation mode, and highly integrated PLL; 5. Low emission power and high receiver sensitivity, launched power 5 ~ 10 dbm adjustable,-109 dbm receiver sensitivity; 6. Built-in clock output can be saved MCU resonator; 7. Higher data transmission rate, digital signal of up to 115.2 kbit/s, analog signal up to 256 kbit/s; 8. Emission Offset and receiving adjustable bandwidth; 9. Internal digital filters, and may request to have a choice of different ways; 10. SPI control interface, and ease of use; 11. When receiving data synchronization code identifier, the system will detect synchronous code behind the
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Size: 38912 |
Author: |
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Description: 搞了个小工具，方便大家计算！不用动笔了！欢迎使用，有bug请斧正，谢谢！
Rf Calc 包含功能：
① mW换算为dBm；
② dBm换算为mW；
③ 空间损耗计算；
④ 链路裕量；
⑤ 传输距离计算。 -Carried out a small tool to facilitate the calculation! Do not have to write a! Welcome, there are bug please斧正, thank you! Rf Calc includes functions: ① mW converted to dBm ② dBm converted to mW ③ space loss calculation ④ link margin ⑤ Calculation of transmission distance.
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Size: 568320 |
Author: 阿伟 |
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Description: ：介绍一种以Atmel公司的单片机 ATmega324p为控制核心，结合数字温度传感器DS18B20和 INTEGRAT10N
公 司的无线收发芯 片 IA4421的数 字化 无线温度传感器的设计 。该设计频段(433 MHz ISM)无 需 申请 即可使 用测 温范 围为
一
4o～95℃ ，分辨率为 0．062 5℃ ，工作频率 433 MHz，接收灵敏度为 109 dBm，最 大发射功 率 8 dBm，传输距 离 200 m，采和
电池供 电。重点介绍该 系统 的硬件接 口、软 件设 计 以及 低 功耗设 计。该数 字化 温度传 感 器可应 用到各 种 需要无 接触 的场 -: An introduction to Atmel' s single-chip ATmega324P for the control of the core, combined with digital temperature sensor DS18B20 and INTEGRAT10N' s wireless transceiver chip IA4421 digital wireless temperature sensor design. The design frequency band (433 MHz ISM) not required to apply to the use of temperature measurement range of 1 4o ~ 95 ℃, a resolution of 0.062 5 ℃, operating frequency 433 MHz, receiver sensitivity of 109 dBm, the maximum transmitting power 8 dBm, transmission distance of 200 m, mining and battery-powered. Focuses on the system hardware interface, software design, and low-power design. The digital temperature sensor can be applied to a variety of non-contact required field
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Size: 242688 |
Author: 郑才特 |
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Description: ：介绍一种以Atmel公司的单片机 ATmega324p为控制核心，结合数字温度传感器DS18B20和 INTEGRAT10N
公 司的无线收发芯 片 IA4421的数 字化 无线温度传感器的设计 。该设计频段(433 MHz ISM)无 需 申请 即可使 用测 温范 围为
一
4o～95℃ ，分辨率为 0．062 5℃ ，工作频率 433 MHz，接收灵敏度为 109 dBm，最 大发射功 率 8 dBm，传输距 离 200 m，采和
电池供 电。重点介绍该 系统 的硬件接 口、软 件设 计 以及 低 功耗设 计。该数 -: An introduction to Atmel' s single-chip ATmega324P for the control of the core, combined with digital temperature sensor DS18B20 and INTEGRAT10N' s wireless transceiver chip IA4421 digital wireless temperature sensor design. The design frequency band (433 MHz ISM) not required to apply to the use of temperature measurement range of 1 4o ~ 95 ℃, a resolution of 0.062 5 ℃, operating frequency 433 MHz, receiver sensitivity of 109 dBm, the maximum transmitting power 8 dBm, transmission distance of 200 m, mining and battery-powered. Focuses on the system hardware interface, software design, and low-power design. The number of
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Size: 7168 |
Author: 郑才特 |
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Description: ：介绍一种以Atmel公司的单片机 ATmega324p为控制核心，结合数字温度传感器DS18B20和 INTEGRAT10N
公 司的无线收发芯 片 IA4421的数 字化 无线温度传感器的设计 。该设计频段(433 MHz ISM)无 需 申请 即可使 用测 温范 围为
一
4o～95℃ ，分辨率为 0．062 5℃ ，工作频率 433 MHz，接收灵敏度为 109 dBm，最 大发射功 率 8 -: An introduction to Atmel' s single-chip ATmega324P for the control of the core, combined with digital temperature sensor DS18B20 and the company' s wireless transceiver INTEGRAT10N chip wireless IA4421 digital temperature sensor designs. The design frequency band (433 MHz ISM) not required to apply to the use of temperature measurement range of 1 4o ~ 95 ℃, a resolution of 0.062 5 ℃, operating frequency 433 MHz, receiver sensitivity of 109 dBm, the maximum transmitting power 8 dBm,
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Size: 68608 |
Author: 郑才特 |
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Description:
MAX7044是基于晶振PLL 的VHF/UHF发射器芯片，在300 MHz～450 MHz频率范围内发射OOK/ASK数据，数据速率达到100 kbps，输出功率+13 dBm(50Ω负载)，电源电压+2.1～+3.6 V，电流消耗在2.7 V时仅7.7 mA。工作温度范围一40℃～＋125℃，采用3 mm×3 mm SOT23 - 8封装。
MAX7033是一个完全集成的低功耗CMOS超外差接收器芯片，接收频率范围在300 MHz～450 MHz的ASK信号。接收器射频输入信号范围从一114 dBm-0dBm。MAX7033芯片内部包含有LNA、差分镜像抑制混频器、PLL、VCO、10.7 MHz IF限幅放大器、AGC、RSSI、模拟基带数据信号恢复等电路。工作电压+3.3 V或+5.0V，250μs启动时间，低功耗模式电流消耗<3.5μA，工作温度-40℃～＋105℃，采用TSSOP-28和薄形QFN-EP* *-32封装。
MAXT044发射器芯片与接收器芯片MAX7033配套，适合汽车遥控、无键进入系统、安防系统、车库门控制、家庭自动化、无线传感器等应用。
-MAXT044发射器芯片与接收器芯片MAX7033配套，适合汽车遥控、无键进入系统、安防系统、车库门控制、家庭自动化、无线传感器等应用。
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Size: 173056 |
Author: backoff |
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Description: Tokyo Cabinet的Tokyo Cabinet 是一个DBM的实现。这里的数据库由一系列key-value对的记录构成。key和value都可以是任意长度的字节序列,既可以是二进制也可以是字符串。这里没有数据类型和数据表的概念。
作者叫Mikio Hirabayashi.Tokyo Cabinet是用C写的，同时提供c,perl,ruby,java的API。Tokyo Cabinet在提供了POSIX和C99的平台上都可用，它以GNU Lesser Public License协议发布。-Tokyo Cabinet is a library of routines for managing a database. The database is a simple data file containing records, each is a pair of a key and a value. Every key and value is serial bytes with variable length. Both binary data and character string can be used as a key and a value. There is neither concept of data tables nor data types. Records are organized in hash table, B+ tree, or fixed-length array.Tokyo Cabinet is written in the C language, and provided as API of C, Perl, Ruby, Java, and Lua. Tokyo Cabinet is available on platforms which have API conforming to C99 and POSIX. Tokyo Cabinet is a free
software licensed under the GNU Lesser General Public License.
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Size: 893952 |
Author: ws |
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Description: 下面进入正题，首先按我个人所接触过的程序给数据库设计人员的功底分一下类：
１、没有系统学习过数据结构的程序员。这类程序员的作品往往只是他们的即兴玩具，他们往往习惯只设计有限的几个表，实现某类功能的数据全部塞在一个表中，各表之间几乎毫无关联。网上不少的免费管理软件都是这样的东西，当程序功能有限，数据量不多的时候，其程序运行起来没有什么问题，但是如果用其管理比较重要的数据，风险性非常大。
-The following into the subject, first of all, I personally contacted by the procedural to the database designers to look at the foundation: 1, there is no systematic study of programmers over the data structure. Such works often programmers just improvise their toys, they are often used to design only a limited number of tables, the realization of all the data in certain types of features in a side table, the table is almost no connection between. A lot of free online management software is such a thing, when the program features a limited, small amount of data when the program up and running without any problems, but if its management is more important to use the data, very large risks.
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Size: 94208 |
Author: 谢新强 |
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Description: 第二代EZRadioPRO系列无线收发器IA443X在240~960MHz频段内的最大输出功率达到了+20dBm，这意味着它的收发距离可远达2千米。与此相对应的是，它的主要竞争对手TI目前实现的最大输出功率是+12dBm。 目前市场产品上，我们是市场上第一家能做到如此大输出功率的公司。IA443X的主要目标应用市场是远程无线抄表、家庭安全和报警、无线PC外设、工业控制、玩具控制和远程汽车遥控等。-EZRadioPRO series of second-generation wireless transceiver IA443X at 240 ~ 960MHz frequency band has reached the maximum output power of+20 dBm, which means that it can be as far as two kilometers from the transceiver. In accord with this is that it' s main rival TI to achieve maximum output current power is+12 dBm. Products currently on the market, we are first in the market one can do such a large output power company. IA443X The main target application markets are remote wireless meter reading, home security and alarm, wireless PC peripherals, industrial controls, remote control toy car remote control, and so on.
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Size: 6775808 |
Author: 李刚 |
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Description: 《Linux 程序设计(第3版)》讲述在Linux系统及其他UNIX风格的操作系统上进行的程序开发，主要内容包括标准Linux C语言函数库和由不同的Linux或UNIX标准指定的各种工具的使用方法，大多数标准Linux开发工具的使用方法，通过DBM和MySQL数据库系统对Linux中的数据进行存储，为X视窗系统建立图形化用户界面等。《Linux 程序设计(第3版)》通过先介绍程序设计理论，再以适当的例子和清晰的解释来阐明它的方式，帮助读者迅速掌握相关知识。
《Linux 程序设计(第3版)》适合Linux的初学者及希望利用Linux进行开发的程序设计人员阅读，也适合作为高等院校计算机相关专业师生的参考教材。
-Linux Programming (3rd Edition)" about the Linux systems and other UNIX-style operating systems on program development, mainly including the standard Linux C language function library and by different Linux or UNIX standard specifies a variety of tools the use of methods, most of the standard Linux development tools to use, through the DBM and the MySQL database system for Linux in the data storage, for the X Window System build graphical user interfaces. "Linux Programming (3rd edition)" by first introducing programming theory, and then with appropriate examples and clear explanations to clarify its way to help readers quickly master the relevant knowledge.
"Linux Programming (3rd edition)" for Linux beginners and want to use Linux for development of the programmers to read, but also suitable as professional teachers and students of institutions of higher learning computer-related reference materials.
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Size: 4056064 |
Author: 梁乐 |
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Description: *芯片组合为PIC16F690-I/SS + CC1100 (434Mhz)，
*专为目前传统RS485电表设计,可不修改表的软件方式直接将RS485表升级成无
线且具有路由的表
*结合目前高效稳定的无线传输芯片TI CC1100.
*拥有接近于透明串口传输(内置最大缓冲区32 bytes).
*支持一对一,一对多传输
*软件在线目的地址切换
*软件在线信道频率切换
*支持信道侦听功能,降低数据冲撞机会.
*支持数据确认功能,提升数据传送的稳定度.
*支持四个独立输入/出点 (TTL-Level)
*超小尺寸 : 30.00mmX23.5mm(不包括天线)
*低成本天线 ,采用弹簧天线
*输出频率 : 433.92Mhz (标准品)
*输出功率 : +10dBm
*接收感度 : -108dBm-* Chip combination PIC16F690-I/SS+ CC1100 (434Mhz),
* RS485 meter for the current traditional design of the table from time to modify the way the software upgrade directly to the table without RS485
Line and has a routing table
* Combined with the current stable and efficient wireless transmission chip TI CC1100.
* Has a close and transparent serial transmission (built-in maximum buffer 32 bytes).
* Support for one to one, one to many transmission
* Destination Address switch software online
* Software online channel frequency switching
* Support the channel listener function, reduce the chance of data collision.
* Support data confirm but also to enhance data transmission reliability.
* Support 4 independent input/output (TTL-Level)
* Ultra small size: 30.00mmX23.5mm (not including antenna)
* Low-cost antennas, antenna with spring
* Output frequency: 433.92Mhz (standard)
* Output power:+10 dBm
* Receive sensitivity:-108dBm
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Size: 183296 |
Author: Henry |
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Description: asp单文件在线数据库管理，支持access,sqlserver在线增、删、查、改等功能。-asp single file line database management, support access, sqlserver online, delete, check, change and other functions.
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Size: 12288 |
Author: 张辉 |
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Description: This project will explain a digital wattmeter from 1pW to 10mW up to 500MHz.
The wattmeter can work alone or together with a computer for collecting data.
Information will be displayed in dBm, Watt, and Voltage into 50 ohm.
With proper attenuator, the measure range can go up to 1kW.
The unit is very accurate, fast and easy to build.
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Size: 331776 |
Author: sasa |
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Description: 显示所有的服务器信息,可以根据需要查询相关内容.还可以查看该台服务器的详细信息,备案信息和非法信息,以及领取该台服务器.审核该台服务器.-Feature simple, object-oriented model development, data binding uses a GridView
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Size: 14336 |
Author: hujun |
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Description: Transformacion a Dbms
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Size: 83968 |
Author: diego |
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Description: 这是可以计算汽车在某工况下需求驱动能量以及制动能量的程序-This is a car under certain conditions can be calculated demand drive energy and the braking energy program
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Size: 3072 |
Author: 段本明 |
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Description: The following permits stdio.h to be included ahead of this file without generating a compiler warning.
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Size: 9216 |
Author: ranqaice |
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