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I want to power a gsm module with a battery.Which is the efficent way to do.1 ) Connecting battery directly to module ?
2 ) Connecting battery to module via dc dc converter . Which achives longest life time? I want to use Lithium-thionyl chloride.
I am waiting for suggesions.
I am using 3.6 V lithium battery for gsm application.But battery cannot maintain peak currents during transmit and modul goes to reset.
I am thinking of putting large capacitors in parallel to battery maintain peaks.
Is it Ok? or not .Disadvantage ? I am waiting for suggestion...
I want to count rotating freq of an object using normaly closed reed switch.My circuit will be powered from battery , I detect the pulse when swicth is opened and I want to drive current only when switch is open.What is the correct wiring for this kind of switch?
I have sim300dz module on sim300c eVB 2.01 board. When I poer up board, I receive call ready message.İf I try to send At commands , board is just echoing At command I sent .
Not responding my commands. I Am usşng only RX and TX signals.Not using control signals( RTS ,DTe ,,etc) . What I...
I am trying to send dtmf signal over pmr radio. I am missing some dtmf codes in the receiver side.I checked the signals in the receiver side with a scope. I saw that signal is corrupt ( corruption is observed at the end of signal ). I attached scope snapshot. Blue is correct signal...
I want to use only one xtal to drive two different ic. ( HT92000 & HT9170 ).
In the reference schematic two 20 pf capacitors are connected to xtal for both two chip. I see in the holtek forum that , to use one xtal , x2 of first chip must be coupled with 30pf capacitor to x1 of second...
PIC with USB (e.g. 18F2550 or 18F4550) all implements slave side of USB protocol.To get picture from webcam you need to implement master side.So PIC wont be enough to implement master.You should look at other controllers that can implement master.CYPRESS has USB master controllers and Maxim has...
I want to mix six channels of audio(stereo is prefered) on an single line and carry them using a wire and then want to seperate them or tune to one of them at the target.
Any suggestions,or links or start up information is wellcome
delay in c microsecond
I used these to get microsecond delays
/***************************** delay.h *****************/
static void delaySeconds( float seconds );
static void delayMiliSeconds( float...
how to write i2c bootloader for pic18f
Lets say you have huge I2C EEPROM.You downloaded new firmware to this EEPROM.In field you dont need to carry laptop to upgrade firmware, just connect
EEPROM to embedded system and restart.Firmware upgrade without using laptop in field.Good idea.Similar...
you are trying to access DDC EEPROM through VGA connector.EEPROM contains information about the video timings,supported format (EDID data )....etc
Address of EEPROM is 0xA0 , most of them are write protected. Only reead operation is available. It ıs usually 128 byte but some devices has...