Connecting Otii, my laptop and the modem

Support
1

Hi!

I have bought an Otii and now would like to use to measure power consumption of BG96 modem. I need to connect an external voltage to Otii and in the same time need the Otii to be connected with my laptop to collect data. On the other hand I need to connect my laptop to the modem over USB to send commands. So multiple voltage sources will be connected to the modem, i. 3.3V through the USB ii. another 5 v though the Otii (Otii is connected to both laptop and external source). Should it work, I am mostly scared if I fry the modem.

2

Hi and welcome to the forum!

I do not completely understand you connection. A block diagram or similar might help.
If you connect the way I guess, then you will get supply from both USB and Otii, but you don’t know how much from USB, so Otii measurement doesn’t say anything.
I might have misunderstood you setup.

Best regards,
Björn

3

Hi!

I tried to quickly draw the setup, let me know if it is readable.

Best,
Mohammad

1
13107×2336 698 KB

4

Hi Mohammad,

I need to know more about the box Modem to give you an answer.
Hos is Power and micro USB connected in this box.

Best regards,
Björn

5

Yes the board that houses the modem has both power and micro usb socket.

IMG_2179
IMG_21793024×4032 2.02 MB

6

Sorry, but I need a lot more information to be able to help you out.
How is USB power connected with the other power connector?

Best regards,
Björn

7

Sorry, which USB?

8

Here is the adapter MiniPCIe to USB2 adapter with casing and external power input - 10087 - USBMS-E-SMA V1.4 - MPCIe/M.2 USB boards - Techship
With login it is also possible to see the schematic diagram of the internal circuit.