Difference between revisions of "Smart IoT Sensor - HW"
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== Pictures == | == Pictures == | ||
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== Electrical Specification == | == Electrical Specification == | ||
Revision as of 15:47, 13 March 2017
Contents
1 Features
2 Pictures
3 Electrical Specification
4 Included Modules and chipsets
4.1 LoRa/Sigfox MM002
The Nemeus MM002 is wired using UART and a wakeup pin.
| Pinning relations | ||||
|---|---|---|---|---|
| Physical pin | Port pin | Function pin on sensor | Function pin on Arduino | Atmel label |
| 28 | PA19 | TX | RX (Serial2) | SERCOM1/PAD[3] |
| 27 | PA18 | RX | TX (Serial2) | SERCOM1/PAD[2] |
| 9 | PA04 | WakeUp | A3 | |
4.2 Bluetooth Smart nRF51822
Nordic Semi: nRF51822 datasheet
the nRF51822 is wired to an Arduino UART port. (Variant AC : 256KB Flash / 32KB Ram)
| Pinning relations | ||||||
|---|---|---|---|---|---|---|
| Physical pin (SAMD) | Physical pin (nRF51) | Port pin (SAMD) | Port pin (nRF51) | Function pin on sensor | Function pin on Arduino | Atmel label |
| 31 | 17 | PB23 | P0.11 | TX | RX (Serial) | SERCOM5/PAD[3] |
| 30 | 15 | PB22 | P0.09 | RX | TX (Serial) | SERCOM5/PAD[2] |
4.3 GPS/GNSS SIM33ELA
The SIM33 GPS is wired using UART to the Arduino.
| Pinning relations | ||||
|---|---|---|---|---|
| Physical pin | Port pin | Function pin on sensor | Function pin on Arduino | Atmel label |
| 15 | PA10 | RX | TX (Serial1) | SERCOM0/PAD[2] |
| 16 | PA11 | TX | RX (Serial1) | SERCOM0/PAD[3] |
| 3 | PA02 | Power enable | A0 | |
| 29 | PA20 | Fix GPS | 6 | |
5 Included Sensors
5.1 ADXL345
The ADXL345 accelerometer is wired to the I2C bus, and can use two interrupts to manage acceleration events (tap, activity...).
| Pinning relations | |||
|---|---|---|---|
| Physical pin | Port pin | Function pin on sensor | Function pin on Arduino |
| 31 | PA22 | SDA | SDA |
| 32 | PA23 | SCL | SCL |
| 7 | PB08 | Interrupt 1 | A1 |
| 8 | PB09 | Interrupt 2 | A2 |
5.2 BMP280
The BMP280 temperature and pressure sensor is wired on I2C bus.
| Pinning relations | |||
|---|---|---|---|
| Physical pin | Port pin | Function pin on sensor | Function pin on Arduino |
| 31 | PA22 | SDA | SDA |
| 32 | PA23 | SCL | SCL |
6 GPIO available
You can use these additional pins :
| Pinning relations | ||
|---|---|---|
| Physical pin | Port pin | Function pin on Arduino |
| x | GND | x |
| 47 | PB02 | A5 |
| 10 | PA05 | A4 |
| 9 | PA04 | A3 |
| x | 3V3 | x |
| 21 | PA12 | MISO |
| 20 | PB11 | SCK |
| 19 | PB10 | MOSI |
| 4 | PA03 | AREF |
| 31 | PA22 | SDA (shared with sensors) |
| 32 | PA23 | SCL (shared with sensors) |
| 26 | PA17 | 13 |
| 30 | PA21 | 7 |
| 11 | PA06 | 8 |
| 12 | PA07 | 9 |
6.1 Additional UARTs
6.1.1 Remap PB10/PB11 as UART
PB10/11 are dedicated to SPI connection to external devices.
If you don't need SPI, you can reuse these GPIOs as another UART
| Pinning relations | ||
|---|---|---|
| Physical pin | Port pin | Function pin on Arduino |
| 23 | PB10 | MOSI / SERCOM4 TX |
| 24 | PB11 | SCK / SERCOM4 RX |
6.1.2 Remap PA22/PA23 as UART
PA22/PA23 are already used as I2C by 2 embedded sensors :
- BMP280 (Temperature and pressure sensor)
- ADXL345 (Accelerometer)
If you don't need them, you can reuse these GPIOs as another UART
| Pinning relations | ||
|---|---|---|
| Physical pin | Port pin | Function pin on Arduino |
| 32 | PA22 | SDA / SERCOM3 TX |
| 33 | PA23 | SCL / SERCOM3 RX |
6.1.3 Example of scenario
This scenario sends "TEST" string to the UART and prints received data coming from the UART to the serial monitor.
To test this scenario, you can connect together the RX and TX pins of the corresponding UART, you will see the "TEST" string in the serial monitor.
It uses SPI GPIOs (MOSI/SCK). If you comment the first line (SERIAL_USE_SPI_PINS), it will use the I2C GPIOs (SDA/SCL).
/* choose to remap SPI or I2C as UART */
#define SERIAL_USE_SPI_PINS
#ifdef SERIAL_USE_SPI_PINS
/*
* PB10 = MOSI = Serial3 TX = SERCOM4/PAD[2]
* PB11 = SCK = Serial3 RX = SERCOM4/PAD[3] */
Uart Serial3( &sercom4, 24, 23, SERCOM_RX_PAD_3, UART_TX_PAD_2 ) ;
#define UART_ISR SERCOM4_Handler
#else
/*
* PA22 = SDA = Serial3 TX = SERCOM3/PAD[0]
* PA23 = SCL = Serial3 RX = SERCOM3/PAD[1] */
Uart Serial3( &sercom3, 33, 32, SERCOM_RX_PAD_1, UART_TX_PAD_0 ) ;
#define UART_ISR SERCOM3_Handler
#endif
void UART_ISR()
{
Serial3.IrqHandler();
}
void setup() {
SerialUSB.begin(115200);
while(!SerialUSB){;;}
SerialUSB.println("Start");
Serial3.begin(115200);
while(!Serial3){;;}
}
void loop()
{
/* Send string to UART */
Serial3.println("TEST");
delay(1000);
while(Serial3.available())
{
/* echo received data to the serial monitor */
SerialUSB.print((char)Serial3.read());
}
}
7 Buttons and LEDs
7.1 Reset Button
A reset button est available on board: pushing the reset button will only reset the SAMD21. In others words, the Arduino bootloader will restart and jump to the user's application.
If the reset is pushed twice, the MCU will remain in bootloader mode, allowing USB emulation and serial communication.
7.2 User Button
The user button is connected in pull down to the MCU.
| Pinning relations | |||
|---|---|---|---|
| Physical pin | Port pin | Function pin on sensor | Function pin on Arduino |
| 25 | PA16 | USER button | 11 |
7.3 LED
The RGB leds are wired on simple GPIOS.
| Pinning relations | |||
|---|---|---|---|
| Physical pin | Port pin | Function pin on sensor | Function pin on Arduino |
| 23 | PA14 | BLUE | 2 |
| 14 | PA09 | GREEN | 3 |
| 24 | PA15 | RED | 5 |
8 Battery
An optional battery can be added inside the case. A 2 pins connector is available on board, leading to a power and charging management IC for the entire board. The Smart IoT Sensor can work by itself without any external connection.
If an USB connection is made, the USB's power will be drained to the battery by the charging IC. While the board is connected, it will use the USB power supply first.
9 Case
The Smart IoT Sensor features a 50*50*25mm case. All the hardware is all-included inside the case. There is no visible outside antenna.
The case has one miniUSB connector for USB communication on one side, and works as power supply as well.
The user LED is visible on the top of the case.
10 Antennas
10.1 Bluetooth Smart antenna
The board embeds an RF Ceramic Antenna.
10.2 GPS/GNSS (SIM33ELA) antenna
The antenna is integrated on the module.
10.3 LoRa/Sigfox (MM002) antenna
We provide a finely tuned PCB antenna onboard.
There is also an UFL connector in case you need an external antenna.
11 SWD Debug Port
The SWD 9 pins connector onboard can be used with your SWD debugger.
We suggest you to use a J-Link 9-pin Cortex-M Adapter with the J-Link BASE SWD debug probe
The SWD switch allows you to choose the SAMD21 or the BLE as SWD target for the debug probe.
11.1 SWD connection to the SAMD21
You received your board with a preloaded firmware in the SAMD chipset. If you bricked your board, this procedure can be used to re-flash the arduino firmware.
Set the SWD switch to MCU position. launch JLinkGDBServer:
/opt/SEGGER/JLink/JLinkGDBServer -if SWD -device ATSAMD21G18 -speed 4000
You should see "Listening on TCP/IP port 2331"
From gdb, connect to the gdbserver:
arm-none-eabi-gdb (gdb) target remote localhost:2331 (gdb) restore bootloader.hex
11.2 SWD connection to the nRF51822
You received your board with a preloaded firmware in the BLE chipset. This firmware is a basic UART to BLE demonstration software.
We describe this procedure in case you need to re-flash the bluetooth firmware to match your specific needs.
Set the SWD switch to BLE position.
The full support can be found from [Nordic https://devzone.nordicsemi.com/tutorials/7/] Here is an abstract for the UART BLE example:
Install GNU Make
sudo apt-get install build-essential checkinstall
Download Nrf51 SDK 11.0.0.
Download nRF5x Command Line Tools.
Set the toolchain path in makefile.windows or makefile.posix depending on platform you are using:
<SDK>/components/toolchain/gcc/Makefile.[platform]
You have to choose the correct LD script for the nRF81822. Please use pca10028 for 256kB of flash and 32KB of ram. Update this file:
<SDK>/examples/bsp/pca10028.h #define RX_PIN_NUMBER 9 #define TX_PIN_NUMBER 11 #define HWFC false
We need to update the main file in uart_init() function :
<SDK>/examples/ble_peripheral/ble_app_uart/main.c APP_UART_FLOW_CONTROL_DISABLED UART_BAUDRATE_BAUDRATE_Baud9600
Now, we can build it, go to:
<SDK>/examples/ble_peripheral/ble_app_uart/pca10028/s130/armgcc
build and flash the BLE chip:
make make flash_softdevice make flash
