About channel number

[Charlotte5822]

Hello!

Can I ask whether it's possible to connect all 32 channel pins of RHD2132? Is it because of power consumption?

[pseudoincorrect]

Hello,
Power wise it will be fine, you will have to adapt the sampling rate and adapt the code to sample all channels.
(I have not touched this project for a long long time :) )

[pseudoincorrect]

We did not connect all the pin because we only needed 8 channels (don't quote me on the exact number). It would not have been possible to sample and send wirelessly all 32 channels at the frequency/sample-rate required. Not a power consumption issue here, rather it was a limitation from the wireless module we used.

[Charlotte5822]

OK, I see. Thanks for your reply. Do you mean that recording all 32 channels is impossible with the function of STM32 and the wireless module? And can I ask how did you power the system during the experiment, button cells or?

[pseudoincorrect]

Recording all channels is possible. It's just that we did not need to. Thus we connected only as much channels as needed (around 8 I think) to save space on the PCB (routing and connector size). We powered it with a 3.7V single cell Li-Po battery (50 mAh).

[Charlotte5822]

I see. I think it was 12 connected channels in total according to PCB. How long did the 50mAh battery support the system? Thanks again.

[pseudoincorrect]

(I don't use eagle anymore, I moved to Altium, thus I cannot inspect the PCB unfortunately). If I recall correctly, it was running for 1,5 hours. but we used plugable batteries, and swapping them when needed.

[Charlotte5822]

Hi,
Can you tell me the footprint of Hirose_DF12, which are the joints between each layer?
Many thanks.

[pseudoincorrect]

Hi,
Footprints are located in the eagle folder.
https://github.com/pseudoincorrect/NeRD_Embedded_System/tree/master/Eagle/Multistage_embedded

You can (probably) find the footprint either on herose website, mouser or digikey website, snapEDA.

Unfortunately, I do not have eagle anymore.