Raspberry Pi: Difference between revisions

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== 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 ==
== Simple things used in every Project ==


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=== Server side ===
=== Server side ===
=== Connect to the internet via Windows (tethering?) ===
[[File:Windows allowTether.png|thumb|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 ===
=== Finding the IP address ===


The SSH is disable by default after 2016. Below is show how to enable without using keyboard.
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].
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>


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


=== Enable ssh ===
=== Enable ssh ===
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Using the terminal: <code>sudo raspi-config</code> or use <code>systemctl</code>:
Using the terminal: <code>sudo raspi-config</code> or use <code>systemctl</code>:


<code>
<pre>
sudo systemctl enable ssh
sudo systemctl enable ssh
sudo systemctl start ssh
sudo systemctl start ssh
</code>
</pre>


== Project Ideas ==
== Project Ideas ==
* [[Pimoroni Galactic Unicorn Hello World]]


*[[Bluetooth LE & Polar Heart Beat Monitor]]
*[[Bluetooth LE & Polar Heart Beat Monitor]]
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*[[Microscope and photo stacking]]
*[[Microscope and photo stacking]]
*[[Online thermometer with local backup]]
*[[Online thermometer with local backup]]
*[[Solar powered on/off line timelapse photography]]
*[[Sound spectrum]]
*[[Sound spectrum]]
*[[Weather station --- Raspberry Pi]]
*[[Connect the APC220 radio module and submit the data to Internet]]
* https://www.weareteachers.com/raspberry-pi-projects/
** Airplay speaker https://www.hackster.io/fvdbosch/raspberry-pi-zero-airplay-speaker-d99feb
** Bug habitat https://allenheard.wordpress.com/2013/11/06/making-a-mini-beast-habitat-raspberry-pi-style/
** Drum set https://www.sciencebuddies.org/science-fair-projects/project-ideas/CompSci_p054/computer-science/electronic-drumset-raspberry-pi
** Light up Art https://www.sciencebuddies.org/science-fair-projects/project-ideas/CompSci_p057/computer-science/light-sensor-art-raspberry-pi
** Robot head https://www.sciencebuddies.org/science-fair-projects/project-ideas/CompSci_p058/computer-science/interactive-toy-raspberry-pi
** 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.


== Peripherals ==
== Peripherals ==
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* Laptop Keyboard: https://raspberrypi.stackexchange.com/questions/5007/using-an-old-laptop-keyboard-with-raspberry-pi https://www.youtube.com/watch?v=AKWheG8wKxM  
* 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
* Temperature, pH
== 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
* [[Scd30 co2 sensor|CD30 Air Quality Sensors Module]] for CO2 and RH/T Measurements I2C PWM Modbus


== Bluetooth ==  
== Bluetooth ==  
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sudo python3 -m pip install pybluez
sudo python3 -m pip install pybluez
</syntaxhighlight>
</syntaxhighlight>
== Start script if Wifi is connected ==
* 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
* 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
* 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
* 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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