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Final 2

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2026-06-04 15:51:07 +03:00
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@@ -30,7 +30,7 @@ When receiving the prototype, we didn't know this and didn't have tools to find
### Prototype 2
For the second version, we switched from yellow to black/blue, to contrast the company colors and it looked way better than the first prototype. This time, we followed and solved all the DRC errors and got the device to work.
For the second version, we switched from yellow to black/blue, to contrast the company colors and it looked way better than the first prototype. This time, we followed and solved all the DRC errors and got the device to work. This was also the version which allowed us to test our minimal bluetooth antenna, and it worked (don't ask about the efficiency)!
But this one was NOT without problems. Turns out, clamping to debug pins on the flex-PCB was eventually fatal to the pins and we lost access to debugging on many of the devices. We also did a lot of stress testing by smashing the device flat, to see if it can take it, and it did... for a while. After stressing it for a while, we found that some pins from the MCU got disconnected from the PCB and the device did not work properly without pushing on the chip.
@@ -46,7 +46,7 @@ After breaking all the second stage prototypes, we decided to do final batch as
If you're crazy enough to want to get your own expensive useless device, then the hardware files are freely available at my [git](https://git.aintmina.org/aintgit/SulaJalmari) as gerbers and diagrams. This was designed in EasyEDA for the convenience of not having to build our own component library, but this has made releasing the CAD project difficult...
* **CPU:** nRF52840-QIAA MCU (on a flex PCB).
* **Sensors:** ICM-20602 IMU and XYC-ALS21C-K1 I2C Ambient Light Sensor.
* **Sensors:** ICM-20602 IMU and XYC-ALS21C-K1 I2C Ambient Light Sensor, bluetooth PCB antenna.
* **Fun stuff:** 2x WS2812B RGB LEDs (the eyes), 8x blue indicator LEDs, Buzzer/Vibration Motor mounts, 2x user buttons.
* **Power:** TP4054 battery charger, two separate LDOs (3V3 and 3.6V).
* **Structure:** Two custom flex PCBs (Head & Legs) attached to a main FR4 base board.