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README.md

Andino Lora

Homepage of Andino Lora

Tabe of Content

  1. Prepare the Debian
  2. Digital inputs
  3. Relay outputs
  4. Power Fail Input
  5. RS232
  6. RS485
  7. CAN Bus
  8. Temperature Sensor
  9. Modem connector
  10. OLED Display
  11. RTC DS3231
  12. GPIO Mapping
  13. Use the SIMCOM 800L for 2G / GPRS

Documentation

Andino Lora - Raspberry Pi on DIN Rail - Front view Andino X2 - Raspberry Pi on DIN Rail - PCB Overview Andino X2 - Raspberry Pi on DIN Rail - Block Diagram


Prepare the Debian

  1. Release the ttyAMA0 from getty and asign it to GIO14, GPIO15
  2. Add a driver for the SPI UART
  3. Add a driver for the CAN Bus
  4. Add a driver for the Temperatur Sensor

Download the Driver for the SPI UART

cd ~/
wget https://github.com/andino-systems/Andino-Lora/raw/master/sc16is752-spi0-ce1.dtbo
sudo cp sc16is752-spi0-ce1.dtbo /boot/overlays/
sudo nano /boot/config.txt

Stop getty on serial0:

sudo nano /boot/cmdline.txt 

Remove “console=…
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 .....

sudo nano /boot/config.txt

add this at the end of the file..

# -----------------------
# Andino LoRa from here
# -----------------------

# SPI on
dtparam=spi=on dtoverlay=spi0-cs,cs0_pin=8,cs1_pin=7

# I2C on
dtparam=i2c_arm=on

# RTC
# sudo apt-get install -y i2c-tools
# i2cdetect -y 1
dtoverlay=i2c-rtc,ds3231

# CAN
# sudo apt-get install can-utils
# sudo ip link set can0 up type can bitrate 125000
# sudo ifconfig
# cansend can0 456#43414e2054657374
# candump can0
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25

# 1. UART
# /dev/ttyAMA0 = Modem
enable_uart=1
dtoverlay=pi3-disable-bt-overlay
dtoverlay=pi3-miniuart-bt

# 2. UART
# /dev/ttySC0 = RS485
# /dev/ttySC1 = RS232
dtoverlay=sc16is752-spi0-ce1

# DS1820 Temp sensor
# cat   /sys/bus/w1/devices/28-00000a990ab5/w1_slave
dtoverlay=w1-gpio-pullup,gpiopin=22,extpullup=on
dtoverlay=w1-gpio,gpiopin=22

After that reboot. Now we are ready to go!

Digital Inputs

The digital inputs are connected to the GPIO: Input1: GPIO13 Input2: GPIO19 Input3: GPIO16 Input4: GPIO26 Input5: GPIO20 Input6: GPIO21

The Inputs are calculated for 24 Volt Input. Normaly a signal of 24 Volt is applied to Pin 2 and the Ground to Pin 3. (active Mode)

By closing the JumperX the Inputs can be driven in passive Mode or Dry Contact. This means a Switch / Relaycontact can be conneted between Pin 3 and Pin 2.

Andino Lora - digital input schematics

Andino Lora - digital input configuration

Relay Output

The Relay are controlled by the GPIO: Relay1: GPIO5 Relay2: GPIO6 Relay3: GPI12

# Export
sudo echo "5" > /sys/class/gpio/export
sudo echo "6" > /sys/class/gpio/export
sudo echo "12" > /sys/class/gpio/export
# Set to output
sudo echo "out" > /sys/class/gpio/gpio5/direction
sudo echo "out" > /sys/class/gpio/gpio6/direction
sudo echo "out" > /sys/class/gpio/gpio12/direction
# Switch on
echo "1" > /sys/class/gpio/gpio5/value
echo "1" > /sys/class/gpio/gpio6/value
echo "1" > /sys/class/gpio/gpio12/value

The Relays can drive 230V and up to 5 ampere. There a no Fuses at the relay contacts!!


Power Fail Input

The Power Fail Input can be used to inform the Raspberry about a Mains Power loss. This can be done by a Switch- / Relay-Contact. Just bridge Pin1 and Pin2 to signal Power good/fail.

Fail Input: GPI18

Andino Lora - Power Fail Input

This feature can be used together with the Andino UPS

sudo echo "18" > /sys/class/gpio/export
sudo echo "in" > /sys/class/gpio/gpio21/direction
cat /sys/class/gpio/gpio18/value

RS232

The RS232 and RS485 based on the SPI Uart from NXP [SC16IS752][1].

After prepare the Debian for the use of the SPI Uart (see Prepare Debian) the /dev/ttySC1 is the RS232 Channel. The Signals on the RS232 Port are +-12 Volt.

Test the UART with python

You can exit minicom with CTRL-A then X

sudo apt-get install minicom
sudo nano minicom –setup
# press Serial Port Setup

+-----------------------------------------------------------------------+
| A -    Serial Device      : /dev/ttySC1                               |
| B - Lockfile Location     : /var/lock                                 |
| C -   Callin Program      :                                           |
| D -  Callout Program      :                                           |
| E -    Bps/Par/Bits       : 38400 8N1                                 |
| F - Hardware Flow Control : No                                        |
| G - Software Flow Control : No                                        |
|                                                                       |
|    Change which setting?                                              |
+-----------------------------------------------------------------------+
        | Screen and keyboard      |
        | Save setup as dfl        |
        | Save setup as..          |
        | Exit                     |
        | Exit from Minicom        |
        +--------------------------+

Test the UART with python

sudo apt-get install python-serial

after that you can send data:

import serial
import time

ser = serial.Serial(
               port="/dev/ttySC1",
               baudrate = 9600,
               parity=serial.PARITY_NONE,
               stopbits=serial.STOPBITS_ONE,
               bytesize=serial.EIGHTBITS,
               timeout=3
           )



for i in range(2):
        ser.setRTS(False)
        time.sleep(0.01)
        ser.write(str(i)+ b"Hello 232\n")
        time.sleep(0.1)
        s = ser.readline()
        print( s.rstrip() )
        ser.setRTS(True)
ser.close()

RS485

After prepare the Debian for the use of the SPI Uart (see Prepare Debian) the /dev/ttySC0 is the RS485 Channel. It can be used as full duplex RS422 or as two wire RS485. In RS485 Mode the transmitter can be switched on either by the RTS signal or automaticaly.

Jumper

RS485 Jumper

Send in manual mode

for i in range(2):
		# Transmitter on
        ser.setRTS(False)
        time.sleep(0.01)
        ser.write(str(i)+ b"Hello 485\r\n")
        time.sleep(0.1)
        s = ser.readline()
        print( s.rstrip() )
		# Transmitter off
        ser.setRTS(True)

Send in RS485 Auto mode

for i in range(2):
        ser.write(str(i)+ b"Hello 485\r\n")
        time.sleep(0.1)
        s = ser.readline()
        print( s.rstrip() )

CAN Bus

The CAN Bus based on the Microchip MCP2515 and the Tranceiver MCP2551. It is supported by the Raspberry Pi.

sudo apt-get install can-utils
sudo ip link set can0 up type can bitrate 125000
sudo ifconfig can0
cansend can0 456#43414e2054657374
# or
candump can0

Temperature Sensor

The Device has a Build in temperatur Sensor DS1820. The Sensor is wired to GPIO 22.

ls /sys/bus/w1/devices/
cat   /sys/bus/w1/devices/28-00000a990ab5/w1_slave
6a 01 4b 46 7f ff 06 10 5f : crc=5f YES
6a 01 4b 46 7f ff 06 10 5f t=22625

This is 22.6225 Degrees Celsius


Modem connector

The Modem is connected to the internal UART of the Raspberry Pi.

/dev/ttyAMA0

This Port has to configured to GPIO14 and GPIO15 (see Prepare Debian)

GPIO14 (TxD) GPIO15 (RxD) GPIO17 (RTS - output) GPIO27 (CTS - input)

Modem Connector


OLED Display

The OLED Display is connected via the I2C Bus with the address 68. The resulution of the Display is 64x128 Pixel.

Check the I2C Devices

apt-get install -y i2c-tools
i2cdetect -y 1

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

0x3C is the OLED-Display 0x68 is the RTC

Install some Tools and Samples

sudo apt-get install -y git
sudo apt-get install -y python-dev python3-dev
sudo apt-get install -y python-imaging python-smbus i2c-tools
sudo apt-get install python-setuptools

git clone https://github.com/adafruit/Adafruit_Python_SSD1306.git
cd Adafruit_Python_SSD1306
sudo python setup.py install
nano  /home/pi/Adafruit_Python_SSD1306/examples/stats.py

uncomment disp = Adafruit_SSD1306.SSD1306_128_64(rst=RST) and comment any other disp..

python /home/pi/Adafruit_Python_SSD1306/examples/stats.py

RTC DS3231

Execute this

sudo -s
chmod +x /etc/rc.local 
apt-get purge -y fake-hwclock 
apt-get remove fake-hwclock -y 
dpkg --purge fake-hwclock 
rm -f /etc/adjtime. 
cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime
ln -s /home/pi/bin/ntp2hwclock.sh /etc/cron.hourly/ntp2hwclock
sudo reboot now

hwclock -w
hwclock -r

This Python script sets the NTP Time to the HWClock as long a NTP connection can established. Place this script at /home/pi/bin/ntp2hwclock.sh (for example, see above)

#!/bin/bash
# Location of logfile
LOGFILE="/usr/local/oeebox/etc/log/ntp.log"
if [ ! -f $LOGFILE ]; then
  touch $LOGFILE
fi
# Set the maximum allowed difference in seconds between Hw-Clock and Sys-Clock
maxDiffSec="2"
msgNoConnection="No connection to time-server"
msgConnection="Connection to time-server"
# Check for NTP connection
if ( ntpq -p | grep -q "^*"  ); then
        echo $msgConnection >> $LOGFILE
        echo "---------------------------------"  >> $LOGFILE
        secHwClock=$(sudo hwclock --debug | grep "^Hw clock time" | awk '{print $(NF-3)}')
        echo "HwClock: $secHwClock sec" >> $LOGFILE
        secSysClock=$(date +"%s")
        echo "SysClock: $secSysClock sec" >> $LOGFILE
        echo "---------------------------------" >> $LOGFILE
        secDiff=$(($secHwClock-$secSysClock))
        # Compute absolute value
        if ( echo $secDiff | grep -q "-" ); then
            secDiff=$(echo $secDiff | cut -d "-" -f 2)
        fi
        echo "Difference: $secDiff sec" >> $LOGFILE
        msgDiff="HwClock difference: $secDiff sec"
        if [ "$secDiff" -gt "$maxDiffSec" ] ; then
                echo "---------------------------------" >> $LOGFILE
                echo "The difference between Hw- and Sys-Clock is more than $maxDiffSec sec." >> $LOGFILE
                echo "Hw-Clock will be updated" >> $LOGFILE
                # Update hwclock from system clock
                sudo hwclock -w
                msgDiff="$msgDiff --> HW-Clock updated." >> $LOGFILE
        fi
        if !(awk '/./{line=$0} END{print line}' $LOGFILE | grep -q "$msgConnection") || [ "$secDiff" -gt "$maxDiffSec" ]; then
                echo $(date)": "$msgConnection". "$msgDiff >> $LOGFILE
        fi
else
        # No NTP connection
        echo $msgNoConnection
        if !(awk '/./{line=$0} END{print line}' $LOGFILE | grep -q "$msgNoConnection"); then
                echo $(date)": $msgNoConnection" >> $LOGFILE
        fi
fi

GPIO Mapping

GPIO Mapping of the Andino Lora

Use the SIMCOM 800L for 2G / GPRS

How to use Raspberry Pi with SI8900 GSM/GPRS

Useful Links

How to use Raspberry Pi with SIM900 GSM/GPRS add-on with bash
How to use internet using PPPD and SIM800 GSM addon?
[1]:http://www.nxp.com/docs/en/data-sheet/SC16IS752_SC16IS762.pdf?

Schematics

Here are the Schematics of the Andino X2