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158 Threads found on sim908
Thread moved. but on using this my code is not compiling, I'm getting compilation error. Problem doesn't seem to be related to sim908. Show the code and error message.
Hi all. For years. I get the PMs related SIMCOM series. So i want to give some tip for success. Most important for you! 1. Make sure your power supply is most suitable for SIMx. (2,5 - 3 A) 2. After power cycle the modem, please don't send anything until you get "Call Ready" or "GPS Ready". THIS IS SO IMPORTANT. 3. Be aware of your modem
Hi, I am interfacing sim908 with atmega1281. I am sending commands to sim908 via tx-rx pin. As i send "AT" it responds "OK" but somehow i cant able to receive that "OK" inside the mcu. By receiving that "Ok" i can go further steps in code. In my hardware connection i connected sim908 with UART1 and displaying its response on (...)
You can use a simple arduino board to communicate with simcom module. You can use sim900 if you only need call/sms. Or you can go for sim908 if you want to use gps too. The module can be interfaced through the serial port of arduino/mcu and communicate via AT commands
I'm using PIC18F4550 at 115200 baud rate to get GPS information from sim908. It works fine with commands sent from PC. Also it works fine with commands from MCU. But the problem is, the MCU can not read the GPS data sent from sim908. I checked the MCU, it can read data if I send the data from PC UART. But can not read SIM module. It reads some
Consider -4dBi of a linear antenna Parallel requires impedance matching Pi then T filter C-R-C-R for 50 Ohms. Separate GPS antenna requires careful location and ground pad size. sim908 datasheet.pdf
You cannot directly use the SIM548 in sim908 breakout board. There are some modifications on the module, unlike sim908, SIM548 has separate Power pin for GPS , and one extra Serial UART for GPS, GPS RTC core to help hot Start, etc but if you are only looking for the GSM part, All the functions are exactly same as sim908
Hi all, I am working on a project that using sim908,module on the board. I have a doubt that how could I set /read the internal real time clock of the module? I have searched for a AT command but nothing was referred on the data sheet..
i have problem with sim908 when i try to connect by gprs and also try to use gps, sim908 will reconnect and gps willbe off i use someat to power on gps inside my code but it will reset the module and it doesnt work please help me tnx
I think the 928 has a superset of then AT commands from the sim908, and thus, it has the AT commands to read the NMEA packets by a single serial interface... but please check that some commands are different and probably you can't make a direct change of a sim908 with a SIM928. (I remember checking the commands for gps warm/cold reset and they we
what you are looking for is a WARM START UP so try changing to AT+CGPSRST=1 or try maybe =2, the manual states that it's better to make a cold reset the first time (=0 like yours) but after that, subsequent resets could be =1 (some pages states =1 is auto, another page states that =1 is hot and =2 is warm) sadly this module doesn't say exactly ho
Hi all, I'm new to the forum and would be glad if somebody could help me out ASAP. I've made my own PCB design for sim908, referring to the datasheet and have been using it in my various several projects for over a year and found no problem. The input to the board is 12V/2A. The output of the LM2576 to the VBAT is 3.98V. According to SIM90
Would be a good idea to show a few lines of sim908 GPS output.
hello all good morning!!!! i am stuck in sim908 Module starting problem. When i push power on key for 1 sec, its not starting. its network pin didnt give o/p. Please help me, its so urgent. i have tried after changing power supply source but still not having solution.
Hi, I have the same question. Does anyone know if sim808 has Embedded AT programming enabled? I have a product with sim908 and I really need to migrate to sim808. But this current product (sim908) has many implementations using EAT. If it's not enabled I'll need to add a microprocessor to the project. Please, any Please anyone?
I'm looking for a specific file used for compiling the SIM900 core for use with embeddedAT (using the arm-none-eabi toolchain rather than RVCT). The file is called "", and would normally be found in the ..\EmbatSIM\comptool\gcc\lib\ directory (according to the app_make_inc_s file). Does anyone have this file? -R
Hi Guys, I am currently working on a project which uses the sim908 module to get GPS co-ordinates of a moving vehicle. The sim908 is installed on a custom PCB and operating from a 3.7V battery. The firmware which interfaces with the sim908 first powers on the GPS module AT+CGPSPWR = 1 Then removes the reset setting AT+CGPSRST = 0 (...)
i have designed a small circuit containing pic mcu and sim908 the circuit works well but after some second it goes off automatically the mcu and rest of circuit work perfectly but sim908 turns off, i have connected 1000uF on VBAT of sim908, supply is best voltage 4v is provided antennas connected ,disconnected in every case it does the same (...)
hello im working on sim908 and i made pcb for it and there is on chip (mega32) on it . now , im writting program for it . i would like to send one sms to module then the micro process the data and turn on one LED.(sms controller) so, i need one example for it in codevision . please help me .... thanks
Hi guys, I have setup a TCPIP connection between my ITEAD sim908 development board and a server on my PC(SocketTest v3) using the following code: AT+CIPSHUT AT+CIPMUX=0 AT+CIPSTATUS AT+CSTT="internet","","" AT+CIPSTATUS AT+CIICR AT+CIPSTATUS AT+CIFSR AT+CIPSTATUS AT+CIPSTART="TCP","","
Hi Guys, I am a newbie to the sim908 module so please be patient with me. I would like to create an IP connection with a PC server which I created with "Socket test". I read much of the AT command manual, and I got this code working: AT+CIPSHUT AT+CIPMUX=0 AT+CIPSTATUS AT+CSTT="internet","","" AT+CIPSTATUS AT+CIICR
Can someone please share the Eagle library for either sim908-C or Astron 1590060-09T-R? I believe SIM548-C also has the same foot-print. So any of the eagle library should work. Thanks!
Hello, I'm working on a tracker, using sim908, using the command: AT + CGPSINF = 0 I can see on the screen 0,0.000000,0.000000,0.000000,20150105235953.000,0,0,0.000000,0.000000 and after synchronize see this: 0, -12.958474, -1239.5747474,20150105235953.000,0,0,0.000000,0.000000 I am sending sms by the latitude, longitude and datetime, whil
can i operate sim908 module by giving 5v to VCHG pin without using any battery on VBAT pin ?
i m working on sim908 i want to get the location but i get "unknown location" then i checked the gps antenna voltage which is zero please tell me separately supply is needed for gps? someone told me that like gsm supply i should also connect gps separate supply it true?
Hi, I need to interface sim908 IC along with sim socket to 8051. sim908 IC meant only IC, no surrounded required circuitry along with chip that sometimes require in other modems. This "extra circuitry" required in this sim908's case? Can I connect 8051 directly to sim908's TX and RX with RS232 in between or any more (...)
Hi, I use sim908 as a gprs module, when I send any command (AT, ATI, ...) to rx of sim908, module echo that command without executing command. (I'd tried ATE0 too) also I updated to B02, B03 and B04 versions and problem still not fixed What's the problem and how can I fix this issue? So many thanks
AT+CGPSINF=0 can anyone tell me the output of this command is already converted in Degree Minutes or we have to convert it ??
Baudrate is not matching ? What is the default baudrate of your sim908 ? 9600 bps ? If yes, in PC Device Manager open properties of COM port being used by sim908 and set baudrate to 9600 bps. Also baudrate in Serial Terminal Software like HyperTerminal should be set to same.
Hi every body I don't know How I can send & receive sms by sim 908 with programing in codevisionAVR. what instructions should I use & give me some examples, please tell me to get in & start working my way. I am a student & I have to do it as soon as possible please help me :cry:
I am trying to connect my sim908 modules to arduino mega 2560 for gps tracking purposes. The gps data works fine but when I send the gps coordinates to my server via httppost (using the library of sim908 example), it only works once time and then display DB not connected....... My server can read one data but not continuously getting new data. Doe
Use a I2C LCD + RTC like DS3231 which gives accurate timings. Both are I2C devices and needs only two wires. The eneryy meter will give pulses and you have to read these pulses and do the maths to find out units consumed and cost for the units. Add sim908 which has both GSM and GPS. Add a vibration sensor. The vibration sensor will be used for anti
Hi, I was able to find the eagle library for sim908 (the SMD version), but was looking for the 2-row pinout version. It looks like the attached photo: 114131 Any help would be very much appreciated. Thanks!
Hello Plz tell me how to get GPS co-ordinates from sim908?
Hi Guys, I tried connecting my Latitude and Longitude data from sim908 and Microcontroller to Google map but not getting a good link for my Project. Can anyone suggest me a Google map link?
I was working with sim908 few months ago. Last time when I used, it was ok. Recently I made some modification to the code. Here is the code, /******************************************************************************* * Program for 'GPS Position Tracker for Car accident' * * Compiler:
Hello fellow, after several days searching google and reading the datasheet, I can not find the solution to my problem and I appeal to your kindness and intelligence. ;-) I designed my own hardware, not achieving the sim908 reply me any AT command, I do not get OK, or RDY. I paired the DTE baudrate (ATmega2560) and modem communication port to 96
I think you need to read AT command format.If you want read msg try to know the message indexing AT+CMGL="ALL" then AT+CMGR=2 you need use proper formatting and steps.
Hello everyone, I am trying to use sim908 with Arduino, but having problems with it. I used the reference design to create my own, below you will find the schematic. I have a stable 3.6~volt VBAT. The problem is : the netlight pin is always high, therefore the net status LED is always shining. It should be blinking, but it doesn't. When i pr
Hello! I'm designing sim908 based Car GSM module, in which I need 12V to 4V PSU. The device in 99% in sleep mode in minimal current consumption and GPS only available on-demand. The easy answer is do a heat loss comparison. For Buck Regulators, the lower the output, the higher the losses. while LDO's are very sensi
Hi every body , I have a problem about nuclear detection radiation . my sensor is RD3024 and the output is pulse . I use ext interrupt of microcontroller to read pulse from sensor . My board include sim908 module more . When sim908 module dont powrt up, all things are ok . But if i power module sim908 then pulse continuos
I am using a Positioning module that has a SMA port to hot plug an SMA antenna. It also has pins available through its foot print to connect a GPS Antenna. The module name is . I was not able to spot a place in its data sheet that describes if both antennas can be connected at once. I want to solder a passive chip antenna about 5-
I'm using sim908 module to gate the GPS data. But there is no data from the module. I tried with all the commands it may required to get the data. But... AT+CGPSPWR=1 OK AT+CGPSRST=1 OK AT+CGPSINF=0 0,0.000000,0.000000,0.000000,20101010000127.000,0,0,0.000000,0.000000 OK there is all zero... I'm using a Active ante
Sir i have completed the message sending part from sim908 to lpc 2148 using the polling method..Now i wanted to do the same with interrupts...i hd written the code for it which i have attached here buts its not working for me...i am not receiving any characters from sim908 now... please let me know where i am gng wrong in the code..... vo
Hi all, I newbie of arduino and gsm/gps/gprs.. May i ask why we have to register GSM sim908 to network? What is function, and if I do not do so, what will happen? Thanks reply JJ
working with sim908 gps and using the antenna prescribed by simcom.however my antenna is taking almost 14 minutes to collect the proper coordinates and time..cud sumone help me with which is the proper antenna to be start the modem im giving the following AT commands AT+CGPSPWR=1 AT+CGPSRST=0 AT+CGPSINF=2 should
i was working on a GSM based system with sim908 and it was working perfectly. After a while i restarted the system and found that GND and Vbat pins are shorted. i really need help on this issue. what to do now?
Hiiii, Im working on sim908 and wanted to know if 9V supply with 1Amp is okay??? i earlier had used adapter wid ratings of 12V bt the modem used to heat up very is 9v okay???Also i checked wid 5V ....the leds wer not glowing much.... pls help me or else i myt burn up dis modem tooo
Hi, I am currently working on my bachelor project and it envolves GSM and GPS, so the choice fell on the sim908 on an Arduino shield form DFRobots here. Although I am quite disappointed with the quality of the product, I don't really have a choice now to ch
If you are contemplating a new design using the SIMCOM sim908 GSM/GPS module please be advised that it will phased out at the end of this year. SIMCOM have suggested SIM928A as an alternative and also advised: Purchase orders will be accepted until 2014/12/15 and the last order will be delivered before 2015/03/31. Cheers.