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The Arduino® MKR IoT Carrier Rev2 is equipped with different sensors, actuators and with a display to leave you free to focus on prototyping and programming your next IoT projects. The carrier does not come equipped with a microcontroller, meaning it only works in combination with an Arduino board. The MKR IoT Carrier Rev2 comes equipped with 5 RGB LEDs, 5 capacitive touch buttons, a colored display, IMU and a variety of quality sensors. It also features a battery holder for a 18650 Li-Ion battery, SD card holder and Grove connectors.
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The chosen Arduino MKR board needs to be mounted on top of the MKR IoT Carrier Rev2 and connected to a computer. The board can be connected as shown in the image below, matching the pin numbers on the board to the ones on the carrier.
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## Datasheet
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## Grove Connectors
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The MKR IoT Carrier Rev2 comes with **three grove connectors** (2 analog and 1 I2C) that enables us to easily connect external sensors. The type of the connector is labeled clearly on the back of the carrier.
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## BME688 Environmental Sensor
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The **[BME688 Environmental Sensor](https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme688-ds000.pdf)** is a 4 in 1 sensor capable of providing the following measurements:
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-**Humidity**, 0‒100% r.H.
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## IMU Accelerometer & Gyroscope Sensors
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The IMU (Inertial Measurement Unit) used on the MKR IoT Carrier Rev2 is the located **behind the display**.
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### LSM6DSOX
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## RGB and Gesture Sensor
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The MKR IoT Carrier Rev2 contains a Broadcom **APDS-9660 RGB and Gesture sensors**, situated under the display and marked with a bulb icon. The sensor is useful for **ambient light** and **RGB** color sensing, **proximity** sensing, and **gesture** detection.
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## Relays
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The MKR IoT Carrier Rev2 is equipped with two 5V Coil voltage **KEMET EE2-5NU-L relays**, located on the back side of the carrier. The relays are non-latching with a **COM** (common), **NO** (Normally open) and **NC** (normally closed) contacts, and can take up a max of **2A** Current and **24 V** of input each.
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The connections between a high power circuit and the relays will be done through these connectors.
The connections between a high power circuit and the relays will be done through these connectors (marked **"high power pins"** in the image above).
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Once the cables are introduced inside the connectors, they will automatically be locked inside. To unlock a cable and remove it from the connector, a tool is needed to be inserted through the top square hole (it can be a flat screwdriver, a hard piece of plastic, etc.).
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The **L1 and L2 LEDs** on the carrier are visual indicators of the state of the relays. If the LED is ON, it means that the **COM** and the **NO** terminal of the relay are **connected**, and if the LED is OFF it means that **COM** and **NC** are **connected**.
The carrier has five **capacitive touch buttons** on its top side, numbered from 0 to 4. The buttons are sensitive to direct touch and can also detect wireless touch.
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### Buzzer
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The MKR IoT Carrier Rev2 is equipped with a **sound buzzer** on the bottom side of the carrier, under the MKR board.
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## Power
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The MKR IoT Carrier Rev2 can be either powered through a USB cable connected to the mounted MKR board, or through a battery. The battery used should be a LI-ION 18650 3.7v battery, which can be mounted to the carrier via the battery holder on the bottom side.
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In order to use the USB power to charge the battery, a little cable with JST connectors on both ends is needed between the MKR IoT Carrier Rev2 and the MKR board. The bBattery can then be recharged via a USB connection through the MKR Board (runs up to 48h with a 3.7v 2500mAh).
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In order to use the USB power to charge the battery, a little cable with JST connectors on both ends is needed between the MKR IoT Carrier Rev2 and the MKR board. The battery can then be recharged via a USB connection through the MKR Board (runs up to 48h with a 3.7v 2500mAh).
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