#FirstInitiativeCompetition# Expand Beidou Satellite (UM220-Ⅲ N) integrated communication module (final draft)

Expand Beidou satellite (UM220-Ⅲ N) integrated communication module--Instructions

0 Preface

         In order to participate in the theme event designed by the Electronic Production Festival held by Lichuang Mall, a glimpse of the second version of the perpetual calendar PCB board with a 6-digit 4-inch digital tube static display for Beidou Satellite Time was exhibited, namely the Beidou Satellite UM220-Ⅲ N expansion port Board, the product is positioned as a communication control exercise for microcontroller beginners, and can be applied to model aircraft positioning, clock timing, navigation and other fields.

**       Beidou satellite UM220-Ⅲ N module is a domestic product made in China. Some outsiders claim that the positioning is not accurate enough. Currently, most users use the U.S. GPS satellite ublox module for timing and navigation. I went against the grain and decided to see it quickly, and expanded its port to 5V/3.3V power supply, 5V /3.3V level communication interface. **

**1. Introduction to the work (purpose, purpose and significance)

1 Practicality:     This expansion port board can be used for programming exercises for microcontroller beginners, aircraft model positioning, clock timing, navigation, etc. The expansion port board has a wide power supply range of 3.3~5V, and the communication port implements two TTL levels of 5V/3.3V, which can be directly connected to the microcontroller. At the same time, it can also learn the communication and data of different level microcontrollers such as I2C and SPI. transmission, program compilation, and then complete the required timing, positioning and other functions.

2 Novelty:

    This port expansion module can control the power switch remotely by the microcontroller or by the J1 short-circuit jumper, and plays an energy-saving role in standby. And the V_BCKP power supply can continuously supply power to the Beidou module and charge the battery. When the external power supply is interrupted, the backup battery maintains the continuity of data recorded by the Beidou module.

2. Highlights of the work (please write down if any) **

 Advantages of this extended version of the port:

**

** ①Expand the power supply to 5.0/3.3V, and the power supply has a wide adaptability range

   ②Expand the TTL level of the output port for direct connection to 5.0/3.3V microcontrollers ③Expand the antenna input terminal to accommodate the selection of 3 different antennas ④Expand other I2C and SPI data ports to make communication mode selection more convenient

   ⑤The PCB circuit board has strong versatility and is suitable for welding and debugging of similar ublox, Beidou and other modules. ⑥Serial port 1 and serial port 2 can output NEMA signals at the same time, and each serial port can be set to a different baud rate**

3. System architecture diagram

4. Schematic**

Port introduction

The port expansion board area division and principle:

①** Power on / off control circuit**

主要控制北斗拓展板的启停，由**J1，R3，R5，Q1组成，当gps_on处于高电平时，Q1截止，为U1中断供电，当gps_on处于低电平时，Q1饱和导通，为U1连续供电。该模式可由单片机远程控制或由J1**短路帽控制。 ②VCC**电源稳压3.3V及跳线电路 由C1,C2,C3,C4,U1,J5组成，电容主要耦合，滤波消除电路的电磁干扰，J5主要用于供电电压3.3V时，短路帽短接以保证数据传输时指示灯供电的正常。 ③**电池充放电电路 由**R1,R2,R4,DZ1,DT1,DT2,BAT1组成，R1,R2分压后经DZ1稳压（这里DZ1也可不用），电流经肖特基二极管DT2，R4为BAT1充电，BAT1经DT1放电至V_BCKP（其中外部电压和电池电压高者为V_BCKP供电），当外部电源断电，直接由BAT1经DT1为V_BCKP提供备用电源，保持BD1**芯片供电的连续性。 ④**复位电路 由常见的积分型复位电路组成，和AVR单片机复位电路类同。 ⑤**天线滤波电路 L1**防止天线的高频输入，造成电源的干扰，利用L1，R14有效的解决了此类问题，最好在L1（标准68nh），R14之间增加2个104电容，效果更好。 ⑥TXD2RXD2通信5V/3.3V输入输出转换电路 由R11，R12，R18，R19，DZ2，DZ3，J3组成，R18，R19起到限流作用，DZ2，DZ3防止电压过冲，其中R11上拉电阻可以不用内部已经上拉 ⑦**其他 (I**2**C,SPI) 3.3V**通信接口,直接3.3V接口引出，未增加电平保护和转换，必须连接3.3V单片机。 ⑧TXD1RXD1通信5V/3.3V输入输出转换电路带通信指示灯 由R15,RXD,Q4,R17构成接收转换电路，当输入RXD_IN为低电平时，RXD1为低电平，此时接收红色指示灯点亮，反之熄灭；R13,TXD,Q3,R16构成发送转换电路，当发送TXD1为低电平时，TXD1_OUT为低电平，此时发送蓝色指示灯点亮，反之熄灭。 ⑨通信BD1**芯片

和芯星通芯片比**UBLOX**信号灵敏度高，双模信号强，但外部可用端口少。

⑩PPS**信号指示灯及输出隔离电路**

由**R10，PPS，Q2，R6组成， 信号正常时R10，PPS为timepluse输出绿色正常信号指示灯，其中PPSOUT端口由Q2**隔离，并供外部单片机使用，有效的隔离外部电压的影响。 11 **供3.3V电源输出端子，当VCC输入3.3V时，需短路帽短接gpsin否则传输信号指示灯无法工作**

5、材料清单（BOM列表)  除第1、2、8、23项，全部采购于立创商城。

6、PCB实物图 6BITSPCB1.rar (下载次数：213) 6BITSPCB1 修改贴片按键尺寸错误版本.zip (下载次数：186) 附上PCB图的图片或者源文件（我们官方建议大家尽量用源文件上传） 如果是图片，请确保图片是清晰可辨的。

7、软件部分的描述(扩展选项，可不写) 51USB DB2-GPS测试程序12864液晶（并行方式）20161022.rar (下载次数：2055) 校时万年历的汇编语言部分代码.rar (下载次数：204)

8、作品演示(扩展选项，可不写) 应用图片及视频链接示例：  8.1附自制万年历校时图片

视频链接：http://v.youku.com/v_show/id_XMTc2MDM4ODM2MA==.html 8.2电脑接收通信实例图片 8.3单片机通信12864显示实例图片 视频链接：http://v.youku.com/v_show/id_XMTc2MDM3NjE0MA==.htm

9焊接技巧及工具

9.1电烙铁：电烙铁的种类比较多，常用的电烙铁有外热式，内热式，恒温式，吸锡式等种类。一般选择普通的35W外热式电烙铁（带接地线）即可满足焊接要求，温控焊台是最佳选择。电烙铁焊接时间不宜过长，3s～10s为最佳，最长不要超过10s，否则容易烫坏元件。 9.2镊子（型号ESD14）：镊子主要用于夹持贴片元器件，镊子夹住管脚也可以帮助散热。 9.3吸锡器：吸出焊盘上过焊孔多余的焊锡，比敲击PCB方式好多了。 9.4松香：松香是常用的助焊剂且绝缘效果好，尽量选择无烟松香，好处就不说了。用25%的松香溶解在75%的酒精（重量比）中作为助焊剂也是不错的选择。 9.5焊锡膏：焊锡膏在电路板上尽量少用，适当的使用可以改善焊接效果。一般焊接前避免电烙铁头挂锡（锡粘），在焊锡膏上蘸几下，同时又可以避免焊锡在焊接过程中氧化及电路板腐蚀。切记：不能涂抹大量焊锡膏至电路板，因为焊锡膏非常容易导电，造成电路板指示灯暗亮及器件短路现象等。这也是本人先前焊接时，损坏多块通信电路板及高价芯片，造成了很大损失后换来的经验。 9.6吸锡带：正常情况下，一般松香都能解决焊锡过多的问题。吸锡带不太常用，但吸锡带可以避免松香在电路板上粘糊糊的粘成一片，去除多余焊锡较松香更有效。 9.7焊锡材料：一般由锡铅合金及一定的活性焊剂按照一定比例配置而成，一般锡占63%，铅占37%，焊锡的液化温度在400℃以下。如果人工焊接的话，焊点应成正弦波峰形状，表面应光滑、无毛刺，锡量适中，焊接过后，记得洗洗手，防止毒物入口。 个人建议：不要选择无铅焊锡，好像毒性比含铅更强一些。 10**、UM220-III NL模块分析及选购建议**  UM220-III N数据接口协议.rar (下载次数：1618)  UM220-III NL_Datasheet_Ch_mail.rar (下载次数：328) 

模块第二版本在调试时确认模块的真假过程 关于UM220-III NL模块，在输入命令时没有应答语句，怎么辨别标签的信息是该公司的产品。谢谢！

UM220-**Ⅲ NL P/N080101003100 7913011417 05863版本为仿真品造成的，该版本似为ublox版本，能在u-center_v8.20软件上可以控制冷启动等，却打着北斗和芯星通的旗号，虽然能用，但却欺骗消费者。电子爱好者请在购买时多加注意了**！ UM220-Ⅲ NL P/N080101003100 7913011417 05863版本输出语句如下： ??:??:??  $GPTXT,01,01,02,MA=CASIC27 ??:??:??  $GPTXT,01,01,02,HW=AT6558,00511051220426F ??:??:??  $GPTXT,01,01,02,IC=AT6558-5N-30-1C500000,ZJ5J824-54-00108137 ??:??:??  $GPTXT,01,01,02,SW=URANUS4,V4.2.4.119 ??:??:??  $GPTXT,01,01,02,TB=2015-11-23,09:58:064F ??:??:??  $GPTXT,01,01,02,MO=GB77 ??:??:??  $GPTXT,01,01,02,BS=SOC_BootLoader,V6.0.0.337 ??:??:??  $GNGGA,,,,,,0,00,25.5,,,,,,64 ??:??:??  $GNRMC,,V,,,,,,,,,,N4D ??:??:??  $GNVTG,,,,,,,,,N2E ??:??:??  $GNZDA,,,,,,56 ??:??:??  $GPTXT,01,01,01,ANTENNA OK35 北京官方答复如下（仅供参考）： 我司模块是没有GPTXT这条语句，这个不是我司模块。我司模块标签上面会有SN号每块模块上的SN都不一样（代表模块的ID）。如果SN号都一致说明非我司产品。 串口2是模块的6、7两个引脚，模块串口的默认波特率为9600。模块串口1和串口2输出的数据是相同的。模块在上电时会输出数据头（如下面所示里面包含模块PN、SN、HW和FW）。如果没有数据头则不是我司模块。命令后面需要以回车换行结尾。请确认如上信息，如果还是未解决可电话联系我。 UM220-III L G1B1 COM1 PN 080101002000 SN 581301134101040 HWVer V1.3 FWVer R1.50Build10516 Copyright (c) 2009-2013, Unicore Communications Inc. All rights reserved. $GNRMC,235958.000,V,0000.000000,N,00000.000000,E,0.000,0.000,,,E,N2D $GNGGA,235958.000,0000.000000,N,00000.000000,E,0,00,127.000,0.000,M,0,M,,69 $GNGLL,0000.000000,N,00000.000000,E,235958.000,V,N5F $GNGSA,A,1,,,,,,,,,,,,,127.000,127.000,127.0002A $GNGSA,A,1,,,,,,,,,,,,,127.000,127.000,127.0002A $GPGSV,1,1,0079 $BDGSV,1,1,00*68 海滨/AE部/ 和芯星通科技（北京）有限公司  

I am testing the statement output after powering on ublox ct1612 ??:??:?? $GPTXT,01,01,02,u-blox ag - www.u-blox.com*50 ??:??:?? $ GPTXT,01,01,02,HW UBX-G60xx 00040007 FFF9FFFFp 5D ??:??:?? $GPTXT,01,01,02,ROM CORE 7.03 (45969) Mar 17 2011 16:18:34 59 ??: ??:?? $GPTXT,01,01,02,ANTSUPERV=AC SD PDoS SR 20 ??:??:?? $GPTXT,01,01,02,ANTSTATUS=DONTKNOW 33 ??:??:?? $GPRMC,,V,,,,,,,,,,N 53 ??:??:?? $GPVTG,,,,,,,,,N 30 ??:??:?? $GPGGA,, ,,,,0,00,99.99,,,,,, 48 ??:??:?? $GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99 30 ? ?:??:?? $GPGGA,,,,,,,0,00,99.99,,,,,, 48 ??:??:?? $GPGSA,A,1,,,,,,,,, ,,,,99.99,99.99,99.99 30   Three types of module positioning renderings (this test was conducted at the same time and place, in front of the window, with different platforms, there may be slight differences, the data is for reference only) Comparison pictures of the appearance of 3 different chips. rar  (Number of downloads: 231) 1. Beidou and CoreStar genuine chips (the satellite display is clearly red and green, the number of satellites is up to 14 and the serial port output baud rate can be modified, and the comprehensive signal acceptance capability is strong) Note: This chip is not compatible with simulation Differences in chips 2. Beidou and CoreStar imitation chips (satellites only display green, the number of satellites is 10, the serial port output baud rate cannot be modified, there is only one serial port, hot start can be controlled by U Center 8.20, etc.) 3. ublox ct1612 Module (the module has weak signal reception ability, but the signal strength is okay when the weather is clear) Comparison of 3 sets of parameters.rar  (Number of downloads: 267) Comprehensive data analysis based on the above three sets of parameters: 1. Beidou and CoreStar genuine chips are worth It has strong dual-mode signal receiving ability and easy to modify the serial port baud rate. 2. HeXinXingTong imitation chips also have relatively strong signal reception capabilities, but due to their poor ability to distinguish between Beidou and ublox signals, this type of chip can be used without considering modifying the baud rate. 3. Factors such as weather are decisive when the ublox ct1612 module receives signals. Conclusion: When the cost is comparable, the dual-mode Beidou genuine chip is the best choice for aircraft model testing, navigation, time correction, etc.   11** , Summary** Every circuit board design takes a lot of personal energy and hard work. However, in the whole process of principle design, PCB drawing, and debugging, I enjoy it and it will improve my future development. at. This expansion port PCB board is designed to be small in size and relatively streamlined. It should be said that it is a pity that the 5V power adapter DC005 interface and the RS232 interface for communication with the computer have not yet been designed. For the time being, you can use the external USB interface communication FR232, PL2302, CH341 module or the RS232 transfer module of the RB9 interface to connect to the computer. One of the debugging experiences: After the module debugging and power-on test, the signal reception was abnormal. After sentence analysis, it was found that the resistance of the antenna welding to the ground was tens of ohms. I disassembled and inspected the antenna patch components. The re-soldering effect was still the same. After the soldering iron heated up, dip it in rosin. Repair and solder the BD module antenna output end again, and the problem is solved. As shown in the picture below, the left picture shows that the ANTENNA SHORT antenna is short-circuited to the ground. The power-on time should not be too long, otherwise the module will be easily burned out; the right picture shows ANTENNA OK, which means it is working normally. Cause analysis: ① After welding, alcohol with a purity of 95% may be used for cleaning. ②Excessive use of solder paste. Debugging experience two: During the debugging process of microcontroller serial communication, data reception was garbled, program download errors occurred, and the 12864 screen display interface was chaotic and unstable. Cause analysis: ① Check the power supply ② LCD module ③ Reset the baud rate ④ Replace the crystal oscillator, etc. Final solution: First, the external power supply uses a 7805 voltage stabilizing chip, which consumes a lot of power and is not enough to meet the needs of the LCD screen and expansion Beidou (UM220-Ⅲ N) port board. Second, the MCU has been damaged by multiple downloads, hot swapping or static electricity, so the module must be replaced. Remember for electronic products: eliminate static electricity at all times and prohibit hot swapping. Debugging experience three: After debugging for 3 days, I found that TXD2 and RXD2 had no signal output, and there was no response when measuring the level with a multimeter. I thought there was something wrong with the port design of the board, so I re-soldered the second board out of desperation, but the result was still the same. Cause analysis: This model of Beidou (UM220-Ⅲ NL P/N080101003100 7913011417 05863) does not support serial port 2 output, so please pay attention when purchasing. Having said that, the positioning speed of Beidou's serial port 1 output is quite fast, with a cold start of only 20 seconds. I hope the second batch I purchased (UM220-Ⅲ NL 34090) is genuine. After getting the 20161020, it turned out to be genuine and the effect was really good. The baud rate serial port supports modification and dual serial ports and other advantages. Debugging experience four: The battery charging circuit will be better if it is properly modified. The matching of the voltage regulator tube and the resistor must be considered. If the resistor is too large, the voltage stabilization effect will not be achieved. If the voltage regulator tube is too small, it will be easy to burn. bad. In the design schematic diagram of this circuit, firstly, R1 and R2 are designed to be 10k and 5.1k, and the effect will be better without the subsequent voltage regulator tube DZ1; secondly, use 330 ohms for R2, and weld the bypass capacitor 104 on R1. DZ1 is 3v3, and the effect is pretty good! You can choose one of two situations when welding. Debugging experience five: When charging the ms621 battery, the resistance should be changed from 330 to 20k. After this data analysis, the charging current of the battery should not exceed 0.015mA. According to the voltage distribution principle, the battery standard voltage is 3.0V, and the charging voltage 3.3V, so the intermediate value (3.3-3.0)/20k=0.015 mA, when the voltage changes, it has minimal impact on battery life. Therefore, the design is not to use a constant current source to charge the battery. It would be safer and more reliable to do some calculations. This port (UM220-Ⅲ N) expansion board has 4 bolt fixing holes and the PCB board size is 50mm*40mm. There are still imperfections in the device layout, wiring and design functions of the PCB board. We hope that the product port design and application will reach a high level. We welcome suggestions for improvement from all walks of life (email: 66243335@qq.com ).          In short, I am very happy to participate in the Electronic Production Festival held by Lichuang Mall, and I am very grateful to the mall for setting up a platform for us electronic enthusiasts. Not only can I communicate with everyone, broaden my horizons, but also express myself and improve my learning methods. While learning new knowledge, I can also understand the gap with the contestants and establish new research directions. Finally, I hope that Lichuang Mall and Jialichuang will become bigger and stronger, go abroad and expand the world. 11 Postscript The original design concept originated from the first version of the perpetual calendar. The error in the crystal oscillator caused the travel time deviation. The perpetual calendar display part consists of a 1.8-inch digital tube for hours, minutes and seconds, a 0.56-inch digital tube for year, month, day, day of the week, lunar calendar, and temperature with decimal point, a total of 22-bit digital tubes. The perpetual calendar designed in this version is based on the American GPS satellite UBLOX module. Although the integrated module of the American GPS satellite positioning and timing perpetual calendar has successfully completed debugging and normal operation, the design port layout, button layout, power supply design, etc. are not perfect, which makes me feel a little unhappy. I will then develop the application and function expansion of the Beidou satellite module. . In the near future, I plan to develop a matching board (plug-in type) that communicates with the expansion port board. It can wirelessly send satellite timing and other control data through NF2401, and achieve safe data coverage within a radius of 200 meters. In online forums, I have seen that He Gong designed a PCB layout for 4-digit 4-inch digital tubes that was relatively streamlined and standardized. Motivated by this idea, we are going to make a second version of the perpetual calendar with a static display of 6-digit 4-inch large digital tubes. It uses the Beidou satellite UM220-Ⅲ N module for timing and adds corresponding functions, including: time setting using button mode, infrared Remote control mode, NF2401 wireless module transmits Beidou (UM220-Ⅲ N) mode or Beidou (UM220-Ⅲ N) mode integrated on PCB board, and data communication mode with the host computer; the display interface adopts switching mode: hour-minute-second, year - month - day, lunar month - day - week, temperature - humidity. Recently, because the NF2401 wireless communication protocol compiler is still in the debugging stage, the second version of the perpetual calendar PCB development board has not yet been completed. It will be followed up..., share it with everyone! I hope that many electronics enthusiasts will gain a lot and be happy... Attached is the second version of the 6-digit 4-inch PCB sample ( interested friends can follow me and I will share it with you after it is completed... )

For more project details, please see the link: http://club.szlcsc.com/article/details_505_1.html

This project is owned by Lichuang Community " Hulu Gouxiong "