DE0-Nano-SoC IOT Demo ISDF16

Embedded Linux Guides
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Introduction

This page will show you step-by-step how to interface a i2c Temperature module to the DE0-Nano-SoC.

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Hardware Requirements

DE0-Nano-SoC Kit at Digi-Key

TH02 Humidity, Temperature Sensor at Digi-Key

USB WIRELESS ADAPTER 150MB 802.11/B/G/N at Digi-Key

USB OTG HOST CABLE at Digi-Key

Demo

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Software Requirements

Disable eth0 and Setup WiFi access with connman

Start connmanctl

debian@arm:~$ connmanctl

Disable eth0, as we are connecting via WiFi

connmanctl> disable ethernet
Disabled ethernet

Enable WiFi

connmanctl> enable wifi
Enabled wifi

Scan WiFi

connmanctl> scan wifi
Scan completed for wifi

List found services

connmanctl> services
    BeagleBone           wifi_00e1b0127538_426561676c65426f6e65_managed_psk

Enable agent

connmanctl> agent on
Agent registered

Connect to open “BeagleBone” Access Point

connmanctl> connect wifi_00e1b0127538_426561676c65426f6e65_managed_psk
Agent RequestInput wifi_00e1b0127538_426561676c65426f6e65_managed_psk
  Passphrase = [ Type=psk, Requirement=mandatory, Alternates=[ WPS ] ]
  WPS = [ Type=wpspin, Requirement=alternate ]
Passphrase? BeagleBone`

exit connmanctl

connmanctl> quit

Check Network:

debian@arm:~$ sudo ifconfig -a
eth0      Link encap:Ethernet  HWaddr 4a:9f:40:e1:c8:5e
          BROADCAST MULTICAST DYNAMIC  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:27 Base address:0xc000
 
lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:3840 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3840 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:296320 (289.3 KiB)  TX bytes:296320 (289.3 KiB)
 
wlx00e1b0127538 Link encap:Ethernet  HWaddr 00:e1:b0:12:75:38
          inet addr:192.168.1.3  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::2e1:b0ff:fe12:7538/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST DYNAMIC  MTU:1500  Metric:1
          RX packets:17 errors:0 dropped:0 overruns:0 frame:0
          TX packets:53 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2772 (2.7 KiB)  TX bytes:10507 (10.2 KiB)

Temperature Sensor

Add device:

debian@arm:~$ sudo sh -c "echo si7005 0x40 > /sys/bus/i2c/devices/i2c-1/new_device"

debian@arm:~$ dmesg | grep i2c-1
[   49.755377] i2c i2c-1: new_device: Instantiated device si7005 at 0x40

Look at the iio device:

debian@arm:~$ ls /sys/bus/iio/devices/iio\:device0/in_temp*
/sys/bus/iio/devices/iio:device0/in_temp_offset
/sys/bus/iio/devices/iio:device0/in_temp_raw
/sys/bus/iio/devices/iio:device0/in_temp_scale

debian@arm:~$ cat /sys/bus/iio/devices/iio:device0/in_temp*
-6400
9452
7.812500

Conversion:

T = ((in_temp0_raw + in_temp0_offset) * in_temp0_scale) / 1000
T = ((9452 + -6400) * 7.812500) / 1000
T = (3052 * 7.812500) / 1000
T = 23843.75 / 1000
T = 23.84375 (C) -> 74.91875 (F)

Script the conversion using bc:

#!/bin/bash -e
in_temp_raw=$(cat /sys/bus/iio/devices/iio:device0/in_temp_raw || true)
in_temp_offset=$(cat /sys/bus/iio/devices/iio:device0/in_temp_offset || true)
in_temp_scale=$(cat /sys/bus/iio/devices/iio:device0/in_temp_scale || true)

if [ ! "x${in_temp_raw}" = "x" ] && [ ! "x${in_temp_offset}" = "x" ] && [ ! "x${in_temp_scale}" = "x" ] ; then
    temp=$(echo "${in_temp_raw} + ${in_temp_offset}" | bc)
    temp=$(echo "scale=5; ${temp} * ${in_temp_scale}" | bc)
    temp=$(echo "scale=3; ${temp} / 1000" | bc)
    echo "${temp}"
fi

Setup Exosite Portals

For this project we are going to use Exosite Portals to store the IOT data.

sudo apt-get update
sudo apt-get install bc build-essential python-dev python-setuptools`

Install Exoline

git clone https://github.com/exosite/exoline --depth=1
cd ./exoline
sudo python setup.py install
cd ~/

Digi-Key Demo

Demo:

git clone https:` `//github.com/RobertCNelson/demos --depth=1

cron:

*  *    * * *   root    /bin/bash /home/debian/demos/intel-soc-fpga-forum-2016/example.sh &> /dev/null &