Hi @fm
@fm said in Voltage of the sim card:
for the SIM7080 you’ll need to provide 3.3 V to pin 36 on the connector which is labelled 3.3V(Out) else the voltage level shifter is not powered on the high side.
This is exactly what has been missing in my attempts. Following your advice resulted in my making it work at last.
Thank you once again.
Best regards,
Mariusz
Hello @fm
In the first place, thank you for your time and involvement.
Sorry for keeping you waiting.
The information you provided has been very useful, as it turned out I have managed to wake the 7080 up from sleep. The Net LED started pulsing.
What is strange, I am still unable to receive any response from the 7080 after sending it the AT command, although the same wiring works perfectly with the 7020. It must have someting to do with voltage levels, I think (the SIM card voltage has nothing to do in this case). I am still trying to figure it out.
Best regards,
Mariusz
Hi @fm
My problem with it is that I cannot make it (7080) start to communicate through UART (so that I can send AT commands to it).
The layout of the two boards (both prepared to work with Raspberry Pi Pico) is exactly the same (at least this is what I think is true),
although the two models differ significantly, and use two different sets of AT commands.
I have no idea what it may be caused by (and the first obvious technical difference between the two is the voltage of the SIM card they approve of).
But it might also have something to do with waking it up, I think.
Thank you,
Mariusz
Hello,
I would just like to make sure that the sim card I have been sent by you within the free account services will operate properly with my Waveshare Pico SIMCom 7080 board (the only card it is going to operate with is a 1.8V one, according to the datasheet).
I am asking since I have been having problems with persuading it to work on the 7080 board. The other one I have (Waveshare SIMCom Pico 7020 board) operates on both 1.8/3.3 V sim card (the datasheet says that), and I don’t have any problems with it.
Best regards,
Mariusz