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# I2C Scanning | ||
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The card is equipped with two low-power LEDs. | ||
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The blue LED functions as a user LED and serves solely as an indicator; for example, it can be illuminated when the card is performing calculations. | ||
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The white LED is connected to a branch of the GNSS module, specifically the TIMEPULSE pin. This pin is in a high state when the GNSS module receives satellite signals, thus turning on the LED. However, it can also be controlled by the microcontroller. | ||
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Therefore, with this pair of LEDs, it is possible to provide the user with different indications based on the illuminated state of the LEDs. | ||
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## Hardware Integration | ||
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| I2C Address | Description | | ||
| ----------- | -------------- | | ||
| 0x10 | RGBW Light | | ||
| 0x19 | Accelerometer | | ||
| 0x1E | Magnetometer | | ||
| 0x76 | Pressure | | ||
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## Board | ||
![KiCad 3D View Front](/0_GitBook/Images/Kicad_3DViewFront_BnW_Sensors.png) | ||
![KiCad 3D View Back](/0_GitBook/Images/Kicad_3DViewBack_BnW_Sensors.png) |