Geeetech

Dear friend, Could you please follow our steps to Check the working state of SIM 1, check if everything goes well with SIM AT+CPIN? Returned value AT+CPIN? +CPIN: READY OK -------------------------------------------------------------------------------- Check if SIM was connected to network AT+COPS？ ...

Dear friend,
We don't understand the meaning of the photos.Could you please tell me what's the problem of the GPRS board you received? Looking forward to your reply

Dear friend,
Could you please tell us how you judge the board didn't work? And what have you done after you received the GPRS board? This will help us find the reason of your problem.Wish you can understand.Looking forward to your reply.

Ok ,friend, thank you for your help.
We already have a solution ,our service customer will contact you .
Best regards!

Ok ,friend, thank you for your help.
We already have a solution ,our service customer will contact you .
Best regards!

Dear friend,
Ok ,we can understand .Would you like to buy a new one in half price ？About the mega2560 you received ,it's a little gift for your project. Some parts of it may be helpful one day. Looking forward to your reply .Best regards!

Dear friened, We can understand your felling,so let us do some deeper test to find the answer. Could you please power the board 9v DC or the slot 5v ,which we have marked in red,you can see diagram from the attachment ? Then you can test whether the 3.3v slot work well ,which we maked in blue. After...

Hello ,friend Sorry for letting you wait so long time.Our engineers have reached an agreement that there are some problems in the 16U2 IC of mega2560 you received.It's not a good idea you send back the mega2560 considering the express fee and wasting time.And we know it's important for you to have a...