Pi 3 b+ and waveshare HAT

[VanVince]

Hi everyone,

recently I bought a new gsm/gprs/gps module, in particular waveshare 7000E NB-IoT HAT. I have some issue with device power key. As te datasheet says it starts automatically, indeed it does. If you want to control the power on/off you have to " Need to modify the back solder joint" (cit. from datasheet page14). Moreover in the picture below is shown these diagram, but honestly I don't understand what to do.

Have I to solder the PWR joint? Anyone have experience with this device?

I have also another waveshare HAT that integrate a SIM868. In this case I wrote a sketch that power on/off the HAT properly. obviously this doesn't work with SIM7000e although they have the same pin configuration.

solder joint datasheet

solder joint SIM7000E-NB-IoT-HAT-Manual-EN.pdf.png (241.72 KiB) Viewed 1889 times

[dobova86]

Hi VanVince,
I think you need to move join PWR to P4 (BS0-H3). This will connect POWERKEY Pin to BCM pin 4 (pin 7 of the connector). Setting pin BCM 4 to 1 will start power to SIM7000. I don't remind if it needs a steady 1 or just a 100ms pulse to start modem.

[VanVince]

Hi dobova86,
thank you for your reply.
So, have I to solder the A joint to the B joint ? To be more specific, first I have to desolder the smd placed on the B joint and then solder A to B. Am I right? Sorry for the questions but I don't want to destroy this HAT

[dobova86]

Oh yes you need to "move" join to the other side.

[xotz]

Hi dobova86,
thank you for your reply.
So, have I to solder the A joint to the B joint ? To be more specific, first I have to desolder the smd placed on the B joint and then solder A to B. Am I right? Sorry for the questions but I don't want to destroy this HAT

Hi, Can you please post a picture of what you have to do and if it worked !
i'm having trouble with this as well .
Thank you.

[VanVince]

Hi, Can you please post a picture of what you have to do and if it worked !
i'm having trouble with this as well .
Thank you.

Hi,
honestly I didn't solder the joint anymore. After all, is good that the GPS HAT starts automatically. At least is good for my project.