Re: H/W Reset for SIM300
hai,
Ravi this kind of problem arises due to power supply..the module ll take more current while sending msg, gprs & call connecting..so check the followings,
1.power supply should capable of delivery current more than 2A.
2.if the circuit is ur own design check voltage carrying line thickness.if it is too thin reset may occur often.
Do the followings if u are sure with the power supply design,
1.connect the pwrkey pin ,status & net light pins with your controller.configure pwrkey pin as output and net light,status pin as input.pull down the pwrkey till net light or status pin gets high.(write using OR).it used to turn on alone.write turn off function with same procedure pull down the power key till the status and pwrkey gets low(here use AND).It takes 5 sec to reset.(use transistors if your controller doesn't satisfy voltage levels of modules check data sheet)
2.use AT+cpowd=1,to reset but it takes more than 15 sec.
last thing if ur board is evaluation board u cant take the pin which i have mentioned above and only way is to reset the modem by relay.
REGARDS,
KARTIKN