serial communication with gsm modem sim 800 contacts

It seems that module doesn’t accept all my data and AT+CIPSEND steel wait for data. If module send me “DATA ACCEPT:10” all work fine but sometimes after AT+CIPSEND=10 with data I haven’t get any respond from module. After it module send me “DATA ACCEPT:10” (AT+CIPQSEND=1) and then my server received 10bytes of data. For example, to send 10 bytes of data I send AT+CIPSEND=10 and then write to serial 10bytes. That all is work fine.īut I have problem with AT+CIPSEND. SIM800L answer to AT commands, attach to gprs network, get local ip address and connect to server via tcpip client mode. For test I use Arduino MEGA 2560 and SIM800L module. Maybe the signal reception of SIM800 is lower than it is with the mobile phone itself. In addition, you can try “AT+COPS=?” to list all available operators and see if your operator is getting listed. Just to be sure, can you try out the same SIM card with a regular phone and see if operator registration happens without any problem. This basically means mobile terminal is currently searching for a operator to register with. Hi Felipe, This looks more like a operator problem to me (because you got “+CREG: 0.2”). (such as GPIO interrupt or data on serial port), GSM MODEM will enter. The RF part of the modem will not work or the SIM card will. AT + CSQ ** This check signal quality I received the answer “+ CSQ: 0.0” I’m trying to send the SMS to the unit, the serial arduino shows that the SMS was I sent, but it does not get any SMS on my device What is possibly occurring thank you!! ** This is to verify that SIM is registered I received the reply “+ CREG: 0.2” What do you mean you’re not registered, however I’m not sure if that’s right, because usually I use the chip in the mobile device. – I received the answer “+ CPIN: READY” That means it is unlocked. I tested the following AT commands AT – I received the response “OK” AT + CPIN? Good afternoon, I’m having trouble sending sms My Sim800l apparently present is functioning normally.

Here is a a great reference with all the information you’ll need about powering Adruino with external power sources. Arduino 5V output will not be able to provide that much of power and will surely damage the Arduino if such power was drawn. This is because SIM800 can consume around 2A during transmission bursts ( page 22 ). IMO, if you need a reliable and long-term setup, it is better to use an external power source for Arduino and SIM800. I was simply using Arduino 5V output to power SIM800 module. Maybe this stackoverflow question will help you: I did not use an external battery in this setup. Sorry, I haven’t used SIM800 for TCP yet (but I should give that a go).

Serial communication with gsm modem sim 800 contacts