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https://www.cod3v.info/index.php?title=Setting_up_the_Raspi
== Some of my Raspberries ==


* Raspeberry 1 (or perhaps 1B) with a camera module on a wood stick. 26 pins. UART.


== Bluetooth on Raspi 3 ==
== Simple things used in every Project ==
 
=== Raspistill ===


<syntaxhighlight>
<syntaxhighlight lang="python">
sudo apt update
raspistill -w 2592 -h 1944 -o name.jpg
sudo apt upgrade
sudo apt-get install python-bluez
#sudo apt install bluetooth pi-bluetooth bluez blueman
</syntaxhighlight>
</syntaxhighlight>


<code>sudo nano /etc/systemd/system/dbus-org.bluez.service</code>. Modify <code>ExecStart=/usr/lib/bluetooth/bluetoothd –C</code>


<code>sudo sdptool add SP</code>
Take a photo and send it to an external server {{GithubDownload|torvalds|linux}}
 
<script src="https://emgithub.com/embed.js?target=https%3A%2F%2Fgithub.com%2Fpytorch%2Fpytorch%2Fblob%2Fmaster%2Ftorch%2Fnn%2Fcpp.py&style=github&showBorder=on&showLineNumbers=on&showFileMeta=on"></script>
 
=== Crontab ===
 
=== Sshpass ===
 
=== Server side ===
 
=== Connect to the internet via Windows (tethering?) ===
 
[[File:Windows allowTether.png|thumb|Allow other network users to connect]]


<code>sudo reboot</code>
Can connect from my computer on the fly, but to allow Raspberry Pi to connect to the external WWW, see the image.


<syntaxhighlight>
See https://raspberrypi.stackexchange.com/questions/11684/how-can-i-connect-my-pi-directly-to-my-pc-and-share-the-internet-connection
sudo apt-get install bluetooth bluez libbluetooth-dev
* Note that the outlook has changed a bit.
sudo python3 -m pip install pybluez
</syntaxhighlight>


=== Finding the IP address ===


The SSH is disable by default after 2016. Below is show how to enable without using keyboard. This is useful also with QNAP NAS: to find it. Remember that booting it up takes a lot of time. The default port is 8080, thus use <code>p</code> tag: <code>nmap  -p 8080 192.168.8.*</code>


Use <code>nmap -F 192.168.8.1-254</code> to fast scan all devices in the local network. The default passwords are listed at [https://tutorials-raspberrypi.com/raspberry-pi-default-login-password/ Raspberry pi default login-password].


<code>nmap -sn 192.168.8.0/24</code> might work better, or without <code>-sn</code> option: <code>nmap 192.168.8.0/24</code>


== Raspi and Ev3-G ==
Try <code>ping raspberrypi.local</code>.


=== Error Messages so far ===
Try <code>sudo nmap -sP 192.168.8.0/24 | awk '/^Nmap/{ip=$NF}/B8:27:EB/{print ip}'</code> with sudo.


raspberry pi device added succesfuly but failed to connect
Try <code>nmap -p 22 192.168.8.0/24</code> to find the SSH ports. Perhaps using sudo.
or <code>nmap -p 22 --open -sV 192.168.8.0/24</code>.


Connection failed: _blueman.RFCOMMError: Failed to get rfcomm channel
=== Enable ssh ===


Paired successfully but this device has no services which can be used with raspberry pi
On another computer, mount the Raspian boot SD card, navigate to the boot folder <code>cd /Volumes/boot</code>, create a blank file called ''ssh'' <code>touch ssh</code>. That's all.




=== Pairing ev3 and Raspi ===
Using the Raspian GUI: Preferences -> Raspberry Pi Configuration -> Interfaces -> SSH.


Pairing and connecting is easy using X11.
Using the terminal: <code>sudo raspi-config</code> or use <code>systemctl</code>:


<code>bluetooth-agent</code> command do not exist on Jessie. Use <code>bluetoothctl</code> with the following script shown on [https://raspberrypi.stackexchange.com/questions/50496/automatically-accept-bluetooth-pairings Stackechange]:
<pre>
sudo systemctl enable ssh
sudo systemctl start ssh
</pre>


<syntaxhighlight>
== Project Ideas ==
sudo bluetoothctl <<EOF
power on
discoverable on
pairable on
agent NoInputNoOutput
default-agent
EOF
</syntaxhighlight>


* [[Pimoroni Galactic Unicorn Hello World]]


<syntaxhighlight>
*[[Bluetooth LE & Polar Heart Beat Monitor]]
bluetoothctl
*[[Camera piano]]
power on
*[[Controlling CD Drive motor]]
discoverable on
*[[Info TV/ Dashboad]]
scan on
*[[Microscope and photo stacking]]
</syntaxhighlight>
*[[Online thermometer with local backup]]
*[[Solar powered on/off line timelapse photography]]
*[[Sound spectrum]]
*[[Weather station --- Raspberry Pi]]
*[[Connect the APC220 radio module and submit the data to Internet]]


<syntaxhighlight>
* https://www.weareteachers.com/raspberry-pi-projects/
trust <ev3 address>
** Airplay speaker https://www.hackster.io/fvdbosch/raspberry-pi-zero-airplay-speaker-d99feb
pair <ev3 address>
** Bug habitat https://allenheard.wordpress.com/2013/11/06/making-a-mini-beast-habitat-raspberry-pi-style/
agent on OR default-agent
** Drum set https://www.sciencebuddies.org/science-fair-projects/project-ideas/CompSci_p054/computer-science/electronic-drumset-raspberry-pi
devices
** Light up Art https://www.sciencebuddies.org/science-fair-projects/project-ideas/CompSci_p057/computer-science/light-sensor-art-raspberry-pi
quit
** Robot head https://www.sciencebuddies.org/science-fair-projects/project-ideas/CompSci_p058/computer-science/interactive-toy-raspberry-pi
</syntaxhighlight>
** Greenhouse https://www.instructables.com/Automated-Greenhouse/
** Smart mirror
** Super computer cluster
** Traffic Lights
** Bird Box https://projects.raspberrypi.org/en/projects/infrared-bird-box
** Plants health https://projects.raspberrypi.org/en/projects/astropi-ndvi
** Ultrasonic Theremin https://www.hackster.io/kevinmcaleer/raspberry-pi-theremin-midi-project-254e7b
** Ja monta muuta.


<syntaxhighlight>
== Peripherals ==
Device 24:71:89:BA:DA:61 ev3dev
Device 00:16:53:53:64:E1 EV3
</syntaxhighlight>


It helps to restart Ev3.
* Analog sensors https://www.rototron.info/raspberry-pi-analog-water-sensor-tutorial/
* Camera
* Dissolved oxygen meter https://www.instructables.com/Plotly-Atlas-Scientific-Graph-Real-Time-Dissolved-/ https://elexhub.com/product/gravity-analog-dissolved-oxygen-sensor-meter-kit/ https://how2electronics.com/dissolved-oxygen-sensor-arduino-interfacing-tutorial/ https://atlas-scientific.com/circuits/ezo-dissolved-oxygen-circuit/# https://atlas-scientific.com/probes/dissolved-oxygen-probe/
* Laptop Keyboard: https://raspberrypi.stackexchange.com/questions/5007/using-an-old-laptop-keyboard-with-raspberry-pi https://www.youtube.com/watch?v=AKWheG8wKxM
* Temperature, pH


The file <code>/etc/bluetooth/rfcomm.conf</code>
== Sensors ==
<syntaxhighlight>
rfcomm0 {
  # Automatically bind the device at startup
  bind no;
  # Bluetooth address of the device
  device 00:16:53:53:64:E1 ;
  # RFCOMM channel for the connection
  channel 2;
  # Description of the connection
  comment "This is Device EV3's serial port.";
}
</syntaxhighlight>


* MG-811 MG811 CO2 Carbon Dioxide Sensor For Arduino UNO R3 Raspberry Pi
* CCS811 CO2 Carbon Dioxide Detector Air Quality Monitor Meter Sensor for Arduino
* MQ-2 Kohlenmonoxid Sensor CO Gas-Sensor, Rauch-Sensor, Raspberry Pi, Arduino
* CJMCU MICS 6814 Kohlenmonoxid Stickstoff Sauerstoff Sensor Co No2 Nh3 Arduino
* MH-Z19 IR infrared Carbon Dioxide Gas Sensor For Air CO2 Concentration Monitor
* Environment Sensor HAT für Raspberry Pi Zero 2 W WH A 3 Model B Plus 4 2GB 8GB
* [[Scd30 co2 sensor|CD30 Air Quality Sensors Module]] for CO2 and RH/T Measurements I2C PWM Modbus


[[https://raspberrypi.stackexchange.com/questions/78155/using-dev-rfcomm0-in-raspberry-pi| To establish Bluetooth]] connection, need to create the serial device that binds to the paired Ev3 robot:
== Bluetooth ==
<syntaxhighlight>
sudo rfcomm connect rfcomm0  00:16:53:53:64:E1
</syntaxhighlight>
or use
<syntaxhighlight>
sudo rfcomm bind /dev/rfcomm0  00:16:53:53:64:E1 1
</syntaxhighlight>
where the last number is the communication channel. It needs to be unique.


=== Some links ===
[https://www.cod3v.info/index.php?title=Setting_up_the_Raspi Setting up the Raspberry Pi.]


*http://www.geekdroppings.com/2018/01/21/raspberry-pi-and-the-lego-ev3-connected-by-bluetooth/
[https://www.cod3v.info/index.php?title=Raspi_and_EV3-G Raspberry Pi and EV3-G]
*https://www.hackster.io/KKE/raspberry-pi-lego-mindstorms-ev3-bluetooth-communication-aa42e2
*https://siouxnetontrack.wordpress.com/2013/09/27/connecting-the-pc-to-our-ev3/
*https://gipprojects.wordpress.com/2013/11/29/using-python-and-raspberry-pi-to-communicate-with-lego-mindstorms-ev3/
*https://ev3lessons.com/en/ProgrammingLessons/beyond/EV3PiLight.pdf
*https://ev3lessons.com/en/ProgrammingLessons/beyond/EV3PiCommunicator.pdf
*http://www.abrowndesign.com/2018/10/25/sending-bluetooth-messages-from-raspberry-pi-to-lego-ev3-stock-firmware/
*https://github.com/lehoff/ev3bt/


[https://www.cod3v.info/index.php?title=Raspi_and_Ev3dev Raspberry Pi and Ev3Dev]


<gallery>
== Erase the SD card ==
MaksymShyte.png|Maksym Shyte @ http://www.geekdroppings.com/2018/01/21/raspberry-pi-and-the-lego-ev3-connected-by-bluetooth/
KoenKempeneers.png|Koen Kempeneers @ https://www.hackster.io/KKE/raspberry-pi-lego-mindstorms-ev3-bluetooth-communication-aa42e2
HansOdenthal.png|Hans Odenthal @ https://siouxnetontrack.wordpress.com/2013/09/27/connecting-the-pc-to-our-ev3/
</gallery>


=== Transmitting From EV3-G To Raspberry Pi ===
Use camera to format the SD card, or see https://www.raspberrypi.org/forums/viewtopic.php?t=204167 .


[[File:EV3BT_sendTo.png|thumb|Two simple scripts to send data to Raspberry Pi.]]
== Bluetooth on Raspi 3 ==


<syntaxhighlight lang="python">
<syntaxhighlight>
#hackster.io -> Raspberry Pi Lego Mindstorms ev3 bluetooth
sudo apt update
import serial
sudo apt upgrade
import time
sudo apt-get install python-bluez
EV3 = serial.Serial('/dev/rfcomm0')
#sudo apt install bluetooth pi-bluetooth bluez blueman
print("Listening to")
try:
    while True:
        n = EV3.inWaiting()
        if n != 0:
            s = EV3.read(n)
            print( s )
            for n in s:
                print( "x%02X" % (n), end=' ' )
                #print( chr( int(n) ) )
            print()
        time.sleep(0.5)
except KeyboardInterrupt:
    pass
EV3.close()
</syntaxhighlight>
</syntaxhighlight>


The received data looks like
<code>sudo nano /etc/systemd/system/dbus-org.bluez.service</code>. Modify <code>ExecStart=/usr/lib/bluetooth/bluetoothd –C</code>
 
<code>sudo sdptool add SP</code>
 
<code>sudo reboot</code>
 
<syntaxhighlight>
<syntaxhighlight>
b'\x12\x00\x01\x00\x81\x9e\x07Status\x00\x04\x00Hei\x00'
sudo apt-get install bluetooth bluez libbluetooth-dev
x12 x00 x01 x00 x81 x9E x07 x53 x74 x61 x74 x75 x73 x00 x04 x00 x48 x65 x69 x00
sudo python3 -m pip install pybluez
</syntaxhighlight>
</syntaxhighlight>


=== Transmitting From Raspberry Pi To EV3-G ===


First start the Python script on the Raspberry Pi and then run the EV3 code.
== Start script if Wifi is connected ==


[[File:BT ev3g hello.png|thumb|Multiple hellos.]]


<syntaxhighlight lang="python">
* Put your script in /etc/network/if-up.d and make it executable. It will be automatically run each time a network interface comes up. https://unix.stackexchange.com/questions/166473/debian-how-to-run-a-script-on-startup-as-soon-as-there-is-an-internet-connecti
#! /usr/bin/env/ python3
import serial
import time
import EV3BT


EV3 = serial.Serial('/dev/rfcomm0')
* Add your script to /etc/network/if-up.d/. Name your script without a '.sh' extension.
s = EV3BT.encodeMessage(EV3BT.MessageType.Text, 'abc', 'Have fun')
Also after adding script run chmod +x /etc/network/if-up.d/yourscriptname to give necessary permission.
for i in range(10):
Make sure the network interface (e.g. wlan0 or eth0) that should trigger your script when turned on is mentioned in the file /etc/network/interfaces. https://askubuntu.com/questions/258580/how-to-run-a-script-depending-on-internet-connection
    print(i)
    s = EV3BT.encodeMessage(EV3BT.MessageType.Text, 'abc', 'Have fun'+ str(i))
    #s = EV3BT.encodeMessage(EV3BT.MessageType.Numeric, 'abc', 123)
    #s = EV3BT.encodeMessage(EV3BT.MessageType.Text, 'abc', 'Have fun')
    print( EV3BT.printMessage(s) )
    EV3.write(s)
    time.sleep(1)
EV3.close()
</syntaxhighlight>


The brick says once ''Hello' and after that wants to connect to raspi. If the wrong password is given, the Python code will shutdown. The <code>update</code> in the EV3-G's Bluetooth command do not work.
* To see only wifi status $ nmcli radio  wifi  https://askubuntu.com/questions/398581/is-there-a-terminal-command-to-verify-if-wifi-is-enabled#398602


== Raspi and Ev3Dev ==
* https://raspberrypi.stackexchange.com/questions/78991/running-a-script-after-an-internet-connection-is-established


* To run a script when the WiFi is connected you can use wpa_cli. In man wpa_cli you find for option -a: https://raspberrypi.stackexchange.com/questions/96050/run-a-script-when-wifi-is-connected-to-a-particular-wifi-network


== ==
* By the time the interface is up, it doesn't means that you have a connectivity at all. If the interface is configured to get IP from DHCP for example, few seconds are needed for the IP configurations. To check for Internet connectivity, you can query the IP of a known webpage with nslookup or dig. If you get a valid answer you can proceed. Otherwise, wait and repeat for a certain number of retries before aborting.  https://stackoverflow.com/questions/33086020/run-script-after-network-is-connected

Latest revision as of 18:22, 23 September 2024

Some of my Raspberries

  • Raspeberry 1 (or perhaps 1B) with a camera module on a wood stick. 26 pins. UART.

Simple things used in every Project

Raspistill

raspistill -w 2592 -h 1944 -o name.jpg


Take a photo and send it to an external server Template:GithubDownload

<script src="https://emgithub.com/embed.js?target=https%3A%2F%2Fgithub.com%2Fpytorch%2Fpytorch%2Fblob%2Fmaster%2Ftorch%2Fnn%2Fcpp.py&style=github&showBorder=on&showLineNumbers=on&showFileMeta=on"></script>

Crontab

Sshpass

Server side

Connect to the internet via Windows (tethering?)

Allow other network users to connect

Can connect from my computer on the fly, but to allow Raspberry Pi to connect to the external WWW, see the image.

See https://raspberrypi.stackexchange.com/questions/11684/how-can-i-connect-my-pi-directly-to-my-pc-and-share-the-internet-connection

  • Note that the outlook has changed a bit.

Finding the IP address

The SSH is disable by default after 2016. Below is show how to enable without using keyboard. This is useful also with QNAP NAS: to find it. Remember that booting it up takes a lot of time. The default port is 8080, thus use p tag: nmap -p 8080 192.168.8.*

Use nmap -F 192.168.8.1-254 to fast scan all devices in the local network. The default passwords are listed at Raspberry pi default login-password.

nmap -sn 192.168.8.0/24 might work better, or without -sn option: nmap 192.168.8.0/24

Try ping raspberrypi.local.

Try sudo nmap -sP 192.168.8.0/24 | awk '/^Nmap/{ip=$NF}/B8:27:EB/{print ip}' with sudo.

Try nmap -p 22 192.168.8.0/24 to find the SSH ports. Perhaps using sudo. or nmap -p 22 --open -sV 192.168.8.0/24.

Enable ssh

On another computer, mount the Raspian boot SD card, navigate to the boot folder cd /Volumes/boot, create a blank file called ssh touch ssh. That's all.


Using the Raspian GUI: Preferences -> Raspberry Pi Configuration -> Interfaces -> SSH.

Using the terminal: sudo raspi-config or use systemctl: 

sudo systemctl enable ssh
sudo systemctl start ssh

Project Ideas

Peripherals

Sensors

  • MG-811 MG811 CO2 Carbon Dioxide Sensor For Arduino UNO R3 Raspberry Pi
  • CCS811 CO2 Carbon Dioxide Detector Air Quality Monitor Meter Sensor for Arduino
  • MQ-2 Kohlenmonoxid Sensor CO Gas-Sensor, Rauch-Sensor, Raspberry Pi, Arduino
  • CJMCU MICS 6814 Kohlenmonoxid Stickstoff Sauerstoff Sensor Co No2 Nh3 Arduino
  • MH-Z19 IR infrared Carbon Dioxide Gas Sensor For Air CO2 Concentration Monitor
  • Environment Sensor HAT für Raspberry Pi Zero 2 W WH A 3 Model B Plus 4 2GB 8GB
  • CD30 Air Quality Sensors Module for CO2 and RH/T Measurements I2C PWM Modbus

Bluetooth

Setting up the Raspberry Pi.

Raspberry Pi and EV3-G

Raspberry Pi and Ev3Dev

Erase the SD card

Use camera to format the SD card, or see https://www.raspberrypi.org/forums/viewtopic.php?t=204167 .

Bluetooth on Raspi 3

sudo apt update
sudo apt upgrade
sudo apt-get install python-bluez
#sudo apt install bluetooth pi-bluetooth bluez blueman

sudo nano /etc/systemd/system/dbus-org.bluez.service. Modify ExecStart=/usr/lib/bluetooth/bluetoothd –C

sudo sdptool add SP

sudo reboot 

sudo apt-get install bluetooth bluez libbluetooth-dev
sudo python3 -m pip install pybluez


Start script if Wifi is connected

  • Add your script to /etc/network/if-up.d/. Name your script without a '.sh' extension.

Also after adding script run chmod +x /etc/network/if-up.d/yourscriptname to give necessary permission. Make sure the network interface (e.g. wlan0 or eth0) that should trigger your script when turned on is mentioned in the file /etc/network/interfaces. https://askubuntu.com/questions/258580/how-to-run-a-script-depending-on-internet-connection

  • By the time the interface is up, it doesn't means that you have a connectivity at all. If the interface is configured to get IP from DHCP for example, few seconds are needed for the IP configurations. To check for Internet connectivity, you can query the IP of a known webpage with nslookup or dig. If you get a valid answer you can proceed. Otherwise, wait and repeat for a certain number of retries before aborting. https://stackoverflow.com/questions/33086020/run-script-after-network-is-connected
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