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Re: soldering sim300
Its kinda bit difficult to solder the connector of SIM300 as its very fine n the spacing b/w the pins is too small. U hav to b either good in soldering or u should hav got a good pcb which repels the solder properly except in pads...
atmega current consumption
what does source and sink current mean?
what is the max current atmega can give as output..
if i want atmega 8 to have minimum current consumption , should the ports be input or output ..if input pulled up or not
can any one pl help with these things..
sim300 supply
Use TPS72501 LDO by texas instuments which can b programmed by setting resistor values to give 4V and even 4.2V n so on till 5V and can support current upto 1A. Don worry abt the the transmit burst, it takes current till 2A only in spikes for which capacitors will provide...
download sim300 serial number
Well here am using atmega8 to send AT commands instead of comp. So i didnt connect serial port cable directly to sim300. I connected comp to my atmega8 via uart in parallel to sim300, to check if my avr transmits AT commands properly and avr echoes whatever it...
sim300 avrfreak schematics
Well i use RPS for my board right now and during transmit burst i saw current shooting upto 1.9A and my voltage was also constant and it didnt drop. Moreover sim300 didnt stop working or shut down at 3.6V but its not responding to AT commands properly even when sim300...
sim300 eagle lib
All of them r available in the SIM300 datasheet itself anyways i shall upload 6pin sim card holder footprint and datasheet which has connector footprint as well. I hav eagle libraries as weel if u need i can mail u
how to get better gsm reception sim300
Well i tried really hard to debug that prob. I hav interfaced it with atmega8 and kept sending AT commands via uart n then for debugging i connected the uart to comp in parallel. AT responses by sim300 was good till 3.68V and then it started responding...
sim300 power
Oh thank you!!! Btw i am planning to run SIM300 by 3.7V Li-ion battery. So is it possible to operate SIM300 with 3.7V Li-ion battery. To test it i powered my circuit by rps and kept checking the working of SIM300 and the netlight led glowed till 3.4V. But SIM300 starts responding...
connect sim300 to telephone
i have a 0.1uf capacitor betweem sim vdd and ground. do i have to change to 0.22uf ..
Added after 2 minutes:
Oh thank you i put .1uf in the ckt and its working fine... Most of the time SIM300 detects simcard But at times say 1/10 times sim card is not being...
sim300cz pin no
my sim vdd goes low after few seconds after powering up the sim 300. can any one pl reason it..
Added after 31 minutes:
thanks stephen. i have a doubt.
I am using 3.7 li ion battery for sim 300. if transmit burst occurs and sim 300 draws 2A current, won't the battery...
footprints symbolism
Well you can get the footprint of 8 pin and 6 pin holder in the SIM300 datasheet. I have 6pin SIM card holder Eagle library, if u want may b i can mail or post it for u. I hav attached 6pin SIM card holder pcb footprint for u...
Vamsi
debug rx sim300
Hi,
I am working on an avr-gsm project and am using sim300. I would like to know if sim300 can be operated by a 3.7 Li-ion battery with a boost converter to 4.2V??? Can anyone heelp me with this issue???
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