Raspberry Pi

Raspberry PI 3

https://www.raspberrypi.org/blog/raspberry-pi-3-on-sale/

The Raspberry Pi 3 has built in WiFi and bluetooth and a quad ARM core. It is the most powerful RPi to date. It also requires the most power to run.

Easy with Noobs MicroSD

With the Raspberry PI 3 and the Noobs microSD card one is essentially up and running after attaching a monitor, keyboard, mouse and powering up.

Raspberry Pi Camera

getting started
https://picamera.readthedocs.io/en/release-1.12/install.html — there is a lot of pages here

Raspberry PI zero

The Raspberry pi Zero is the other newest RPi. It is physically small and requires less power than other RPis. It has no on-board wifi or ethernet but it does have a single USB on-the-go port.

Tested RPi with HDMI connected to a TV.

It appears that when HDMI is to be used it should be connected prior to booting RPi or there is no HDMI output.

Made a few changes

Used graphic system to set
- US keyboard
- Place set as Canada
- set timezone to America/Vancouver
- changed default boot to CLI (boot faster and most of the time graphical system will not be used)
Used CLI to set Time and Date

Saving Space in MicroSD (using serial interface and terminal)

Disconnected HDMI from TV and keyboard and mouse. Used serial connection from GPIO interface to connect to a computer using serial to USB converter.

Note used Assembled Pi T-Cobbler Plus - GPIO Breakout - for RasPi A+/B+/Pi 2/Pi 3

Also used USB to serial converter.

TTLyFTDI USB-to-TTL Cable Adapter
- this device can be set to 3.3 volts by cutting a trace and adding a solder bridge.
- the Raspberry Pi GPIO interface cannot tolerate 5 volts!

sudo date -s "jun 18 20:03:00 2016"

sudo apt-get purge libreoffice wolfram-engine sonic-pi scratch sudo apt-get autoremove

Mounting flash drives

If the X GUI is being used flashdrives will be automatically mounted.

If/when using the CLI the flash drive can be mounted with:

sudo mount -o uid=pi -o gid=pi -t vfat /dev/sda1 /media/usb

Note that assumes the mount point has been created. See http://www.raspberrypi-spy.co.uk/2014/05/how-to-mount-a-usb-flash-disk-on-the-raspberry-pi/

Turning the Raspberry PI Zero into a device

There have been changes to the Kernel and procedures

newer

Raspberry Pi Zero OTG Mode

I tried setting g_cdc which makes the Raspberry Pi Zero appear as both a TCP/IP nertwork connection and serial device.

It seemed to work fine for IP using ssh with a chromebook.
sftp also worked for file transfer.
The serial interface also works on a Linux machine. It appears as /dev/ttyACM0. Note FTDI adapters show up as /dev/ttyUSB0.
- What is the difference between /dev/ttyUSB and /dev/ttyACM?

Note the usb of the Raspberry Pi was set to a static address 169.254.64.64

On the RPi Zero the following was used to setup a gateway

also on the linux PC IP forwarding was enabled

danp@electron:~$ sudo ifconfig usb0 169.254.64.1  danp@electron:~$ sudo ssh pi@169.254.64.64

pi@raspberrypi:~ $ sudo ip route add default via 169.254.64.1

danp@electron:~$ sudo sysctl net.ipv4.ip_forward=1

At this point the raspberry pi zero could ping the host computer and the router. Pings are not getting farther.

This was fixed by using iptables to enable NAT.

At this point it was possible to ping internet sites such as google.com but only using the IP address. To get the DNS to work I had to edit /etc/resolv.conf and add the following

danp@electron:~$ sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

# Generated by resolvconf # set to dns for ISP  search isp.com nameserver {DNS goes here}

For my home ISP I’m using 64.59.144.18

Once this was setup one could ping sites by the URL. Also apt-get update worked so packages can be installed from the internet! This means The RPi Zero os connected to the internet through the USB cable (and the host computer with its LAN connection).

Routing on a Windows 7 machine

http://www.wikihow.com/Enable-IP-Routing

More to come.

Port Forwarding Web

Computers beyond the one the Raspberry Pi Zero is directly attached to can see the web server on The Pi only if port forwarding is allowed on the PC connecting the USB port to the web. In this case the simple Python server has been used on the RPi listing on port 8888.

pi@raspberrypi:~ $ python -m SimpleHTTPServer 8888

danp@electron:~$ sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT --to 169.254.64.64:8888

Now it is possible to see the web pages on the RPi Zero gadget from other computers on the LAN.

older

turning raspberry pi zero into a usb gadget
alternate method - RASPBERRY PI ZERO – PROGRAMMING OVER USB! (PART 2) - does note require special image
- May not work with chromebook and crouton Trying to get avahi to work: Daemon not running #2331

Using the “alternate method linked above Jessie-lite was installed in a MicroSD card. Since avahi is not working on the Chromebook/crouton computed I attached to the Raspberry PI Zero with:

(trusty)danp@localhost:~$ sudo ifconfig usb0 169.254.170.1 (trusty)danp@localhost:~$ sudo ssh pi@169.254.170.84

Note that the IP address was found using a ifconfig command issued in the serial interface to the zero.

Using Net Beans for C Programming

Raspberry Pi and the IoT in C

GPIO Zero

GPIO Zero is a Python module to control GPIO. If presision timing is required an external MCU could be used (controlled by a serial interface)

See https://www.raspberrypi.org/blog/gpio-zero-a-friendly-python-api-for-physical-computing/

Using /dev/ttyAMA0 Connected to PIC32MX

The PIC32MX is capable of precise timing on its own GPIO and can connect to the RPi Zero /dev/AMA0 serial port.

Controlling GPIO pins via the Internet

Controlling GPIO pins via the Internet

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