User's Guide

Hardware description
6.7 Environment sensors
To monitor its surroundings, Nordic Thingy:91 has a multi-sensor chip that contains several sensors for
detecting different environmental properties and a separate color and light sensor.
The multi-sensor chip contains sensors for temperature, humidity, air quality, and air pressure.
Figure 26: Environment sensor schematic
The color sensor onboard Nordic Thingy:91 senses red, green, blue, and infrared light. The sensor faces
towards the blue transparent bottom case with light pipes guiding the light towards the sensor. To
measure the color on a surface, the color sensor is accompanied with an RGB LED that can illuminate
the surface enabling the color sensor to read the color of the reflected light. The color sensor is accessed
through I
2
C (slave address 0x38).
Figure 27: Color sensor schematic
6.8 Buzzer
For audio output, Nordic Thingy:91 has a magnetic buzzer. The buzzer is driven by a transistor using a
PWM input.
Figure 28: Buzzer schematic
4418_1336 v1.2
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