SIM808 Crashes (kills) BLUNO MEGA2560
jgenest1 2016-12-30 04:26:54 3559 Views5 Replies There seems to be an important problem when using the bluno mega2560 with the SIM808 shield.
Basically I plugged the SIM808 shield to a standard MEGA board (not the bluno), redirecting the shield TX/RX pins to the mega Serial1 port. This way I can communicate with the arduino using the usb/serial and the arduino can talk to the SIM808 on Serial1.
Works great with the standard MEGA board. I've defined serial commands to power up/down the 808, send AT commands, send text messages. Using the DFRobot_SIM808 code and library. All good.
Doing exactly the same with the bluno actually kills the bluno board. I can send my program to the bluno, send benign serial commands (like AT) but as soon I try to power up the 808 modem, the bluno crashes such that it is no longer seen on the USB port (it is not seen on bluetooth either). I've repeated that with two bluno MEGA boards, thinking the first one had an earlier firmware. The second time, I upgraded the firmware to 1.97 before trying anything.
Well I'm now the owner of two bricked bluno MEGA boards and I've lost time and more than 100$ on that
Basically I plugged the SIM808 shield to a standard MEGA board (not the bluno), redirecting the shield TX/RX pins to the mega Serial1 port. This way I can communicate with the arduino using the usb/serial and the arduino can talk to the SIM808 on Serial1.
Works great with the standard MEGA board. I've defined serial commands to power up/down the 808, send AT commands, send text messages. Using the DFRobot_SIM808 code and library. All good.
Doing exactly the same with the bluno actually kills the bluno board. I can send my program to the bluno, send benign serial commands (like AT) but as soon I try to power up the 808 modem, the bluno crashes such that it is no longer seen on the USB port (it is not seen on bluetooth either). I've repeated that with two bluno MEGA boards, thinking the first one had an earlier firmware. The second time, I upgraded the firmware to 1.97 before trying anything.
Well I'm now the owner of two bricked bluno MEGA boards and I've lost time and more than 100$ on that
2017-01-12 23:54:49 Hi Sir,
I know there is a switch and I also set the switch. The result is when we plugged the sim808 onto the bluno mega2560, we cant upload the code, take the sim808 off, uploading code would be properly. So I guess there must be some problems with the PCB. Our colleagues are working to solving the problem.
After we find the problem, we will deal with your requirments ASAP. Thanks for your patience. Or you can give me your email address, we will contact you soon
Wendy.Hu
I know there is a switch and I also set the switch. The result is when we plugged the sim808 onto the bluno mega2560, we cant upload the code, take the sim808 off, uploading code would be properly. So I guess there must be some problems with the PCB. Our colleagues are working to solving the problem.
After we find the problem, we will deal with your requirments ASAP. Thanks for your patience. Or you can give me your email address, we will contact you soon
Wendy.Hu 2017-01-12 06:13:19 Diagram ? I have the SIM808 shield directly plugged to the bluno, only the serial pins are cut and rewired to the serial1 port.
The problem you describe is because the SIM808 is using the serial port. There is a switch on the SIM808 to free the serial port in order to upload code. jgenest1
The problem you describe is because the SIM808 is using the serial port. There is a switch on the SIM808 to free the serial port in order to upload code.
jgenest1 2017-01-03 22:30:23 Hi
Its a little strange. In theory, it should be no problem. I did a test, then the bootloader is fine. But when I try to plug the SIM808 into the Bluno Mega2560, I cant upload the code to Bluno (can be seen on the USB port), when only Bluno, I can upload the code properly. For this problem, I will give a feedback to our team. Before that, could you please give me some pictures about your diagram? These would be helpful to know what happened. Wendy.Hu
Its a little strange. In theory, it should be no problem. I did a test, then the bootloader is fine. But when I try to plug the SIM808 into the Bluno Mega2560, I cant upload the code to Bluno (can be seen on the USB port), when only Bluno, I can upload the code properly. For this problem, I will give a feedback to our team. Before that, could you please give me some pictures about your diagram? These would be helpful to know what happened.
Wendy.Hu 2016-12-31 17:19:46 Yes, the boot loader is most definitely gone.
I do not have the hardware to flash it back.
The replacements would not be of a big help, what I really need is a solution to use a bluno mega with a SIM808 card.
Regard jgenest1
I do not have the hardware to flash it back.
The replacements would not be of a big help, what I really need is a solution to use a bluno mega with a SIM808 card.
Regard
jgenest1 2016-12-31 00:40:42 Hi
Sorry for your bad experience and inconvenience for you.
Do you mean the two Bluno are no longer seen on the USB port, right? If so, maybe the bootloader of the CC2540 is lost. Under the warranty, you can go to your order page to apply for the RMA to demand a replacement. Of course, here is a link, you can make a reference first:make_clickable_callback(MAGIC_URL_FULL, ' ', 'https://www.dfrobot.com/wiki/index.php/How_to_flash_a_new_CC2540_chip_with_DFRobot_BLE_service%3F', '', ' class="postlink"')
Let me know if you have any problem. Wendy.Hu
Sorry for your bad experience and inconvenience for you.
Do you mean the two Bluno are no longer seen on the USB port, right? If so, maybe the bootloader of the CC2540 is lost. Under the warranty, you can go to your order page to apply for the RMA to demand a replacement. Of course, here is a link, you can make a reference first:make_clickable_callback(MAGIC_URL_FULL, ' ', 'https://www.dfrobot.com/wiki/index.php/How_to_flash_a_new_CC2540_chip_with_DFRobot_BLE_service%3F', '', ' class="postlink"')
Let me know if you have any problem.
Wendy.Hu 