Off we go with the things we already had on February 24th: A Block diagram, some crude models and basic size considerations.
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We know that if the prototypes don't work, we might have to cancel the project. HDI PCB lead times indicate that there might be no second chance. @card10badge
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We know that if we are not able to find a solution in which we have very high confidence, the @card10badge project will fail. There is no time for a second prototype.
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- How big is it? We need some free space for other components around it.
- Where is its connector located? It should not collide with the battery.
- Can it be replaced without soldering?
- How much does it cost?
The PMIC will not charge the battery unless instructed so by the CPU. The problem: The CPU can not start if the battery is empty.
We start to think about circuit level hacks to get around this issue.
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OLED:
- Off: 4 uA
- 1 pixel on: 77 uA
- all pixels on: 23 mA
IPS:
- Off: 0-10 uA
- 0% backlight: 2.1 mA
- 20% backlight: 5.4 mA
- 100% backlight: 20.7 mA
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- We don't want the @card10badge to become a status symbol by selling it.
- We need to order parts soon but we don't know for how many badges.
- Producing fewer units will increase the price of each.
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- Too little solder paste
- Voiding inside the solder joints
We figure that maybe the 80 um solder paste stencil really should have been a 100 um one. Maybe also bad handling during SMT
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As usual we only send the Gerbers for a single board and a simple drawing for the panel.
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- The bypass diode hack
- A software switchable 3.3 V rail for low power operation
- Lots of 0 Ohm resistors for assembly variants
- The RGB-LEDs move from 3.3 V to the raw battery voltage
- Updated USB-C pinout
- ESD protection for the wirstband pins
- ECG chip changes from QFN to BGA
- Minor changes for better PCB yield
- Experimental windows above the LEDs of the bottom board
- Large pads for finger bases ECG measurements
- PPG sensor next to the ECG pads for blood pressure estimation
- New I2C port expander from @nxp
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Our crystal dealer only has old stock from 2017 which we have to accept.
Only two days before #CCCamp2019!
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The problem: The tracking number we got is for a shipment addressed to someone else!
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- Talk to our CM. Again.
- Try to get (at least some) CPUs earlier.
- Think about creative ways how to emergency assemble the CPU by hand at camp.
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Thanks to a very dedicated team at @maximintegrated we will get a drop shipment directly from the IC test house in Taiwan to reduce shipping time. Next steps: Preparing customs/compliance documents so that there are no surprises.
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Tomorrow (Thursday) is a bank holiday and on Friday only a few people will be working...
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We are shocked. At that rate we will have no more than 30% done buy the _end_ of #CCCamp2019.
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The problem: They have to manually rework a whole lot of the boards due to tomb stoning of components. That slows them down a lot.
No pictures of people due to privacy concerns.
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It will take us two more days to receive and distribute all remaining card10s.
media.ccc.de/v/Camp2019-103…
(I'm not on stage due to total burnout)