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Is this a first time that you had checked the output voltage of this UPS? or had checked before? I think you are using a locally made UPS. If YES than don't worry, its normal. The voltage goes lower and so on upon increasing LOAD.
First of all check your P3 jumper and do proper jumper setting
For Board to PC interface:
1. Connect Jumper 3 and 1, as PC Tx must be connected to SIM300 Rx
2. Connect Jumper 8 and 6, as PC Rx must be connected to SIM300 Tx
Than start your module and do necessary things.
From your previous...
i think their is an issue with your circuit, you are recieving from dev board, but you are unable to send back your command, does your board contain any jumper setting on Tx and Rx connection? if this is than you have to check this and do correct settings. If it has MAX232 IC for PC Connection...
Do these setting first
ATE0
AT + IFC = 1,1
AT + IPR = 9600
AT + CSCS = "GSM"
AT&W
Than you need a restart of sim300, and connect with Br@y++ terminal with 9600,
If you are getting cointinous LED Blinks per second, than check your SIM with an ordinary mobile, Your SIM has to be work on...
You program has some bugs, As i said earlier that before and after sending "OK" SIM300 send 10 and 13,
You may use like this, i am adjusting few things rest you have to change.
unsigned char c[6];
init();
ES=1;
EA=1;
P0=0xFF;
transmit('A');
transmit('T');
transmit('\r');
c[0]=recive()...
Using delay for communication is not recommended, yes it may be working fine, but some time it may give you trouble, do know which microcontroller is present in SIM300/900? Its ARMv7 or ARMv6, some time ARM microcontroller will reponse with some delay, than what your program will do?????
You need to disable echo by ATE0 command, actually, when you are testing with hyper terminal you recieve each and every character you have sent.
When ever SIM300 or SIM900 send back you feedback either it is 'OK' or some thing else, it will always start and end with ASCII Character 10 and 13...
What kind interfacing problem you are facing? All mentioned microcontroller are usefull, micro selection is dependent upon you, if you are skilled in PIC you have to select suitable PIC controller according to your requirement. Same applies for other microcontrollers.
If you are unable to...
you have to check sim manual. At&w support so many command storage. If you want to save only few commands. Than you have to start your sim with a power key and enable and disable your reqired command than set at&w. Only your set commands will be save. Rest will remain on default stage
FOr the first time you have to disable echo command by ATE0 and than write AT&W command, it will write ATE0 permanantly to EEPROM of SIM300, after this you will not need to re-disable your echo command.
In cascaded display module, each 7 Segments have to be display for atleast 100micro seconds to 5 ms, this time is different for different display, two segments may have 1ms to 10ms time range.
For detection, first take all 7 segments inputs to micro (including each segment's enable input to...
3volt battery is the basic requirement. Whenever a power reset occured what time you get than? Is 00:00:00 or any other specific time always? I think you are getting one time always instead of 00:00:00 if m right than problem lies on your code startup. Check startup program you may be writing...
It is simple, Register 02h is hour register, you need to first download correct settings for 12h readings than you have to read this register and transfer accordingly,
Bit 6 must be 1 for 12h, bit 5 is for AM/PM, PM = 1, and AM = 0, and rest bits for hour.
For example you have to download...
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