A series of ARM based single board computers developed to promote teaching basic computer science in schools and developing countries. Cost is between $25 and $35 for the board, without power, SD Card, and other critical items, although a full system can easily be made for less than $100 with reasonable performance. Processors range from 700MHz single 32 bit to 900MHz quad core. A powerful GPU (24 GFLOPS) is also included with multiple video outputs. They typically run an OS based on Linux (although a minimal version of Windows is also available^) with scripting in Python or GCC compiled C or C++.
In general, the Pi is NOT designed to do real time processing, and so is best paired with an Arduino, PIC, or other uC for lower level device control. The Pi should be used to provide high level control, via ROS and do high level processing (e.g. OpenCV) and leave time critical tasks to smaller processors via I2C, serial, or other IO methods.
Having said that, you CAN program the RP bare metal, and this is commonly done with the RP2040 modules which are very low cost. FYI, you can program RP2040's without installing anything via the Wokwi website, just press F1 to command palette and click Download UF2 Binary. Hold the button on the RP2040 and plug it into USB and it enumerates as a FLASH drive. Drop the fine on, power cycle, it's programmed. https://docs.wokwi.com/parts/wokwi-pi-pico So you can 1. Simulate the hardware 2. write the code 3. Download and program the device. Done.
Note, the Compute module column refers to the bare Compute module, not connected to any IO board.
Feature | Model A | Model B | Model A+ | Model B+ | Compute Module | Zero |
---|---|---|---|---|---|---|
BRCM2835 SoC | Yes | Yes | Yes | Yes | Yes | Yes |
Standard SoC Speed | 700Mhz | 700Mhz | 700Mhz | 700Mhz | 700Mhz | 1GHz |
RAM | 256MB | 512MB* | 256MB | 512MB | 512MB | 512 MB |
Storage | Full SD | Full SD | Micro SD | Micro SD | 4GB eMMC | Micro SD |
Ethernet 10/100 | No | Yes | No | Yes | No | No |
HDMI output port | Yes | Yes | Yes | Yes | Yes | mini |
Composite video output | Yes | Yes | On 3.5mm jack | On 3.5mm jack | Yes | unpopulated |
Number of USB2.0 ports | 1 | 2 | 1 | 4 | 1 | 1 OTG |
Expansion header | 26 | 26 | 40 | 40 | N/A | unpopulated |
Number of available GPIO | 17 | 17 | 26 | 26 | 48 | 26? |
3.5mm audio jack | Yes | Yes | Audio/Video | Audio/Video | N/A | N/A |
Number of camera interface ports (CSI-2) | 1 | 1 | 1 | 1 | 2 | N/A |
Number of LCD display interface ports (DSI) | 1 | 1 | 1 | 1 | 2 | N/A |
Power (bare, approx, 5v) | 300mA, 1.5W | 700mA, 3.5W | 650mA, 3W | 160mA | ||
Size | 85 x 56 x 15mm | 85 x 56 x 17mm | 65 x 56 x 12mm | 85 x 56 x 17mm | 62 x 30 x 3mm | 65 x 30 x 5mm |
To setup a Raspberry Pi, you need a computer, an SD card slot, a USB cable / power cord, and an Internet connection. You can also use the NOOBs system ^ to boot the Pi and then download one of several operating systems into the device. This requires a good external internet connection on the Pi which may not be available and is inherently unsecure. The method used here does not require the Pi to be exposed to the external internet.
On a Windows PC, you will also need an imaging program like:
http://sourceforge.net/projects/win32diskimager/
and a telnet program like
http://www.putty.org/
If you have a keyboard and monitor connected, you should see the standard Debian startup and be prompted to log in. If you want to connect "headless" to the Pi without using a local keyboard and monitor, be sure you have a working network connection (via ethernet or wifi) and then proceed as follows:
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Go to the bottom of the file and add:
network={ ssid="Your_Network_SSID" scan_ssid=1 psk="Your_wifi_password" }
You can have multiple network entries.
If it doesn't automatically connect, try
sudo ifup wlan0
or restart:
sudo shutdown -r now
Good luck getting it to stay connected to wifi.
Note: When working from the command prompt, especailly remotely, you may
find the "screen" program very useful:
sudo apt-get install screen
press ctrl+a from the prompt to activate screen, then one of: ? for help,
c to make a new "window", n to switch to the next window, d to drop back
to shell. You can run screen -r to see a list of windows and
screen -r window to re-attach to a dropped window.
For more step by step instructions see: Embedded Computing 101: Raspberry Pi Fundamentals
Add items to the menu by editing .desktop files in /usr/share/raspi-ui-overrides. It may help to sudo pcmanfm and then right click the files and select properties for a nice user interface. Keepin in mind, the home "pi" folder is actually under /home/pi.
You can write programs for the Pi on the Pi... most Pi OSs have a
C/C++ compiler or Python scripting
pre-installed. Writing code can be as easy as making a folder, editing a
source file, (see Linux Documentation) and
compiling with:
gcc <code file> -o <application file>
chmod +x <application file>
For more step by step instructions see: Embedded Computing 101: Raspberry Pi Fundamentals start at Slide 10
Installing OpenCV on a Raspberry Pi
Installing ROS on a Raspberry Pi
See also:
file: /Techref/RasPis.htm, 29KB, , updated: 2024/3/16 10:29, local time: 2024/8/14 15:43,
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