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[Little Brosers] Stepping into the PCB’s design

Hello every one!

 

Ok, first things first : yes, my week in Madrid was great. Thanks for asking.

You need to see the Royal Palace if you ever go there, it’s beautiful. Seriously.

Let’s get back to our dear dead drops. I had no chance to publish any post last week but still, there is always something happening in the ROSE’s projects!

 

Updates on PSSC

We began this week with a meeting about PSSCs. To be honest, some of our early PSSC were late on schedule and others had not much time left before its deadline. Thus, the first days of the week were dedicated to put the finished ones in “Wait for validation” state and actually finish the others. We had a code review session as well as an android app test among the team’s member’s phones. The goal was to make sure the ongoing notification (the ones you can’t dismiss by swiping) generated by our app could not be dismissed on any of our phones.

We now wait for the ROSES’s guru’s validation.

 

Lucky me!

Ok, so this week I wanted to start our PCB. The thing is… there is not su much to wire, and that’s great!

 

Indeed, our drops will only contain a battery holder, a flash memory, a JTAG connector, a SoC , a quartz and some passive components. We don’t even need to bother about the battery recharging system because… we don’t need one. Remember! Our goal is to be able to hide our Drops in a hard to reach stash, we don’t care about recharging the battery.

Moreover, our dear Nordic engineers have put into their info center a typical NRF52832 schematic for us. I started from it to design our PCB.

Also, by default I chose the DC/DC power mode for the SoC. We’ll discuss it in our next group meeting, but it is very likely the power mode we will use considering its lower consumption compared to LDO power mode.

About our flash memory, we made the simple choice to take the same than the previous Dead Drops-like project (ROSE 2014). Of course, the idea is not to copy their work but reading theirs posts about this particular flash and their PCB helped me determine how we will wire it for our NRF52. In their logbook posts they also explained the few trubles they had with this flash memory. It’s a work we will not have to waist time on. Thanks’ fellows!

 

I guess that is all for this week.

 

See you next week!

 

Antony Lopez

Antony Lopez

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