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Hardware SAMR21 node
The SAMR21 open node is based on an Atmel SAM R21 Xplained Pro evaluation kit built on top of an Atmel ARM Cortex M0 micro-controller. This new open node also contains an IEEE 802.15.4 Atmel radio interface at 2.4 GHz.
The SAMR21 Open Node can reset, debug and program the ARM Cortex M0 through the embedded debugger (EDBG) connected to the gateway USB port. This component also allows a UART connection to the M0. The input power source is configured through the power management.
IoT-LAB special configuration
The serial connection baudrate should be configured at 115200 bauds in the firmware.
Schematics and Datasheets
In details, the main hardware components contained in the node are :
- ATSAMR21G18A (48 MHz, 32bits, 32kB RAM, 256kB flash)
- Radio interface 2.4 GHz AT86RF233
- One on-board LED (orange)
Extensions with sensors
Nodes in Saclay site (samr21-1 to samr21-15) are equipped with Atmel I/01 Xplained extension. On those nodes, extra sensors are also available:
- a Light sensor Vishay TEMT600
- a Temperature sensor Atmel AT30TSE758
- an extra LED (orange)
- a microSD Card Connector
IoT-LAB provides an example firmware that can be tested on SAMR21 board. This firmware is based on RIOT-OS default example. It can interact with the I/O1 Xplained extension (only temperature sensor and LED are supported for the moment). Example of RIOT shell commands:
% list available commands help % list network interface ifconfig % broadcast a message txtsnd 4 bcast "Hello IoT-LAB" % read temperature sensor saul read 0