So you know the sleep mode requirements of 1mA.
But what does it use when it is not in sleep mode and how often are you going to wake it up to use it.
As it will last a long time in sleep mode on that battery (approx 960 hours), but you need the other variables to find out its true runtime.
Is this battery also powering other functions i.e. a controlling micro
Hope that helps a bit.
hi
I have problems in GPS run( GPS data is not correct ....
What should I do?
We are also using SIM908c module for our project. But we are facing issue in sim network registration. After module power on sim network registration is failing every time. After power on module it returns "NORMAL POWER DOWN +CREG:3 +CGREG:3". Did you also face this issue ?
We are also using SIM908c module for our project. But we are facing issue in sim network registration. After module power on sim network registration is failing every time. After power on module it returns "NORMAL POWER DOWN +CREG:3 +CGREG:3". Did you also face this issue ?
hi vikasmaanWe are also using SIM908c module for our project. But we are facing issue in sim network registration. After module power on sim network registration is failing every time. After power on module it returns "NORMAL POWER DOWN +CREG:3 +CGREG:3". Did you also face this issue ?
// Memorizing GPS configurations' commands into Code Memory
char strGPS_PowerUp [] PROGMEM = "AT+CGPSPWR=1\r\n";
char strGPS_Mode1 [] PROGMEM = "AT+CGPSRST=1\r\n";
char strGPS_BaudRate [] PROGMEM = "AT+CGPSIPR=9600\r\n";
char strGPS_OutPut [] PROGMEM = "AT+CGPSOUT=32\r\n";
char strGPS_PowerDown [] PROGMEM = "AT+CGPSPWR=0\r\n";
hi vikasmaan
I work with sim908 too
I power on it and the module find and register to GSM net and some works like sending SMS.
but it can not find gps location properly and it status is "Location Unknown"
can you help me what to do?:???:
Hello Guys,
Actually are you using a Passive GPS Antenna or Active GPS Antenna, if Active one so don't forget to make sure that you're supplying the GPSANT pin with the antenna propper voltage!
Command procedure which worked with me after contacting the Technical Support:
Code:// Memorizing GPS configurations' commands into Code Memory char strGPS_PowerUp [] PROGMEM = "AT+CGPSPWR=1\r\n"; char strGPS_Mode1 [] PROGMEM = "AT+CGPSRST=1\r\n"; char strGPS_BaudRate [] PROGMEM = "AT+CGPSIPR=9600\r\n"; char strGPS_OutPut [] PROGMEM = "AT+CGPSOUT=32\r\n"; char strGPS_PowerDown [] PROGMEM = "AT+CGPSPWR=0\r\n";
I am also facing with this problem.
This is my command sequence:
send:AT
recv: 6
OK
send:AT+CSQ
recv: 20
+CSQ: 22,0
OK
send:AT+GSV
recv: 65
SIMCOM_Ltd
SIMCOM_SIM908
Revision:1137B03SIM908M64_ST
OK
send:AT+CGPSPWR=1
recv: 6
OK
send:AT+CGPSRST=0
recv: 6
OK
send:AT+CGPSOUT=255
recv: 6
OK
send:AT+CGPSIPR=115200
recv: 6
OK
send:AT+CGPSSTATUS?
recv: 39
+CGPSSTATUS: Location Unknown
OK
send:AT+CGPSINF=32
recv: 67
32,000054.001,V,0.000000,N,0.000000,E,0.00,0.00,10 1010,,E,A
OK
---------------
I received respond form CGPSSTATUS: Location Unknown
And data from CGPSINF seem to be invalid.
Could you help me to solve this.
Maybe I make mistake or forgot some command??
My GPS antenna is placed outside so I dont think the problem come from antenna.
Thank you
hi vikasmaan
I work with sim908 too
I power on it and the module find and register to GSM net and some works like sending SMS.
but it can not find gps location properly and it status is "Location Unknown"
can you help me what to do?:???:
is there any body that run gps sim908 ?
i need some data shuch as pdf file that describe How run GPS of Sim908 .
thanks.
We are also using SIM908c module for our project. But we are facing issue in sim network registration. After module power on sim network registration is failing every time. After power on module it returns "NORMAL POWER DOWN +CREG:3 +CGREG:3". Did you also face this issue ?
hi
I have problems in GPS run( GPS data is not correct ....
What should I do?
Hi Echo wang,
Looks like you know much about SIM908.
I am struggling for several days now where the gps coordinate given by my SIM908 very much not accurate, it shows my home missed about 20km on google maps!
What could be the cause? I use 3-5V ceramic patch antenna with GPS-VANT-IN pin connected to VBAT (4.2V) and GPS-VANT-OUT left open, antenna connected through GPS RF connector.
TIA, Ichan.
Hi Echo Wang, thanks for your respond.
The problem solved, my bad to miss interpret the output of AT+CGPSINF=0 command - here is my answer of my own similar question on other forum https://www.sonsivri.to/forum/index.php?topic=44973
The AT+CGMR command give me Revision:1137B03SIM908M64_ST, is there newer firmware available?
I have a feeling that you are one of Simcom FAE, how to get the tools for SIM908 EAT?
-ichan
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