• Testing Success and Data-Logger Code

    Mirko • 12/01/2022 at 13:06 • 0 comments

    Testing was successfully done! 

    • ✓ ESP32 flashing and Serial works
    • ✓ Pressure Sensor works
    • ✓ BMX160 works
    • ✓ Buzzer Works
    • ✓ Debug LED works
    • ✓ Battery sense Pin ADC works
    • ✓ Battery charging works incl. charging indicator LEDs!
    • ✓ Reset and Event Button are running
    • ✓ SD-Card works

    The SD-Card Holder is pretty shitty and already kind of broke after a few times in and out. I created a 3D case which is about to be printed. With that case I can attach the device via the Wahoo connector to any bike.

    I also wrote the code for data-logging to write the sensor data to the SD-Card. With this setup I can go out and collect data of different jumps and tricks on a bike which I then can throw into some TinyML processing tool like Edge Impulse or similar. 

    I still need to lean about machine learning on microntrollers. 

  • Prototype Testing!

    Mirko • 04/28/2022 at 17:48 • 0 comments

    Prototype was soldered! 

    • ✓ ESP32 flashing and Serial works
    • ✓ Pressure Sensor works
    • ✓ BMX160 works
    • ✓ Buzzer Works
    • ✓ Debug LED works
    • ✓ Battery sense Pin ADC works
    • ✓ Battery charging works incl. charging indicator LEDs!
      • except that the LEDs are glimming if the LDO is disabled
    • ❌ forgot to add GPIO0 to a button which was needed for flashing. 
      • was able to patch it with a cable and disconnecting the btn1 button
    • ❌ SD-Card is connected wrongly! 
      • I use µSD-Card reader but connected the Pins like with default SD-Card. I thought the Pinout is the same but the default SD Card has one extra GND. Can not patch it :( 

    All in all I am happy that at least most of the things are working. I have to make new Boards to fix the SD-Card but before I am running more tests.

    I am running a battery life-time test. The device is running for 7h+ with one charge being connected to WiFi sending continous data to the cloud. That will be more then sufficient for the use-case. Somehow my code dies at around 35% Battery life which seems a bit weird. Once restarted it runs just fine but now and then stops for no reason. But that might be a different issue because the device stays connected to WiFi and is reachable - just not sure what might causing that.

  • DSP368 Driver written in Toit is done

    Mirko • 04/16/2022 at 08:40 • 0 comments

    Driver for the DPS368 in written in Toit(lang) is "done" (it does what it should do but notevery feature is yet implemented)

    https://github.com/Informaticore/toit-dps368

    next step: soldering the ESP32 prototype.. I am waiting for the solder past.