Raspberry Pi model: 3B
Running Raspbian OS
Recently I bought a Hyperpixel 2.1 round, which uses all of the GPIO ports. Whenever I plug the Raspberry Pi into my network switch, it is unable to connect to the network with the Hyperpixel attached. However, when I removed the Hyperpixel, the Ethernet capability came back.
I'm fairly sure it's a software issue given that there shouldn't be any problems with running all gpio pins in addition to Ethernet.
Is this a quirk with the Raspberry Pi that it doesn't like having all GPIO ports occupied as well as Ethernet? And how would I potentially go about fixing this, perhaps through command line or in the boot config?
Related
I'm a totally newbie and interested in physical programming like raspberry pi's. Is there any way to get the data which is intended to go to a "USB to TTL converter device" through USB(e.g. the output of a flashing software), read it and convert it to TTL using Python or C language? I mean something like:
Compiler --> avrdude --> Ethernet port of the compiler host PC --> Ethernet port of a Raspberry Pi --> Pins of the Raspberry Pi --> avr microcontroller
My question is about the code which I should run on the Raspberry Pi to do all the work required on that side. I'm guessing in this specific example it's possible to install avrdude on the Raspberry Pi and pipe the compiled code from the PC to the avrdude on the pi but I'm looking for a general solution that can be used with all microcontrollers, essentially turning the Raspberry Pi into a transparent, Ethernet connected, USB to TTL converter, either existing libraries or directions to how to write such code and where to read the documentations.
Edit1: There's a C language library called pigpio already installed on the Raspberry Pi OS and it can output UART. But I don't know how to read the USB data coming to the Raspberry Pi through its Ethernet port and convert it to UART data.
Edit2: I Changed USB port to Ethernet port since you can't connect two computers directly through USB. The data coming from the PC is still intended for USB to TTL converters since that's how avrdude and similar softwares are written(I guess it'll be "USB over Ethernet").
I've been trying to communicate different models of Roomba vacuum robots, 9xx and 6xx series, with a raspberry using the sci port of the roomba with no success. The sequence of steps have been:
connect pins 3 (rxd), 4 (txd), and 6 (ground) of the roomba port (5v) with a sparkfun logic level converter.
connect the output (3.3v) from the logic level converter to the gpio of the raspberry pi. Roomba Rxd to rpi txd, roomba txd to pi rxd, ground to ground.
connect rpi 5v to logic level converter HV and at the same time LV to gpio pin 1 (3.3v) for feeding high and low voltage required by the logic level converter.
disable serial console of the rpi
enable serial port hardware of the rpi
install and then open minicom in the rpi using this command
minicom -b 115200 -o -D /dev/serial0
place the roomba in the charging dock
I would now expect to read information about the charging process of the roomba in the minicom console but that's not happening.
Anyone knows if any of those steps is wrong?
My goals are to been able to read robots bump sensors in first place and then control movements of the robot from a pc using the rpi in between.
Thanks for any help.
Check this webseite. it's explaining exactly how to connect the roomba to the raspberry using an logic level converter
https://domoticproject.com/roomberry-surveillance-robot-roomba-raspberry-pi-zero-w-camera/
I'm working on a project where I need two raspberry pis to communicate and the ethernet port is not free, I'm not allowed to make any changes to the GPIO pins, and I'm forced to use the USB port due to hardware considerations. Is it possible for them to communicate using a direct USB cable, or perhaps using two USB-RS232 cables?
Thanks!
Siddharth
I would use the TTL serial pins on the GIO header. See https://elinux.org/images/1/13/Adafruit-connection.jpg
You could create your own simple null modem serial cable - consisting of 3 jumper cables.
Connect pins
6 <--> 6
8 <--> 10
10 <--> 8
If you can't use the GPIO header - you can do a USB to USB connection using USBNET. http://www.linux-usb.org/usbnet/
Is it possible for them to communicate using a direct USB cable, or perhaps using two USB-RS232 cables?
You fail to mention exactly which Raspberry Pi version(s) you are using.
Only the Raspberry PI Zero can be used as a USB Gadget.
Since USB is a master-slave(s) interface & protocol, you cannot simply connect two Raspberry PI 1/2/3 boards together using USB, because that would be a master-to-master connection.
If you look hard enough for a (passive) USB Type A (male) to Type A (male) cable, you can find them, but it's a bogus connection that will not work.
There are active USB host-to-host cables (which contain a shared gadget), but support can be an issue.
You could connect a Raspberry PI 1/2/3 to a Raspberry PI Zero by USB, so long as the Zero's USB port was configured as a USB ACM CDC gadget.
However one simple solution is your alternative of installing USB-to-RS232 adapters to each board. A null-modem cable of three wires would suffice unless you needed hardware flow-control.
An alternative solution is installing USB-to-Ethernet adapters to each board (with static IP addresses, i.e. an ad-hoc connection). This approach provides a much faster connection than an RS-232 link, and is easily utilized by applications.
I want to install MATLAB and Simulink support package for Raspberry Pi. I follow this link to do . I directly connect my laptop with Raspberry Pi using Ethernat cable.
But i didn't get output.
while installing i got error - "Could not detect a Raspberry Pi board on "Local Area Connection". Check your Ethernet connection to Raspberry Pi.
The FDX/LNK/100 LEDs on the Raspberry Pi board should be illuminated.
For network trouble-shooting instructions see http://www.mathworks.com">The MathWorks Web Site"
Can anyone help to solve this problem?
I have also experienced your same issue but after proceeding in this way I solved it.
Before you put the SD card on the Raspberry Pi you need:
power off the Pi
connect the Ethernet cable to the host computer
finally power on the Pi
In addition you may take a look at this troubleshooting guide.
Try the following steps.
1. Open cmd and execute 'ipconfig'
check for a network interface with '169.x.x.x' ip address
If there is one, you could access your Pi via IP 169.254.0.2
If there is none, check if your Ethernet port is enabled and no static IP is configured.
The above steps make sure that your Ethernet port is in proper state.
Repeat the hardware setup with direct connection in the network settings.
I want to interface raspberrp pi and Mbed microcontroller through I2c bus. Both operate at 3.3v, I have connected Rpi SCL ----> mbed SCL, RPI SDA------> mbed SDA, RPI gnd -----> mbed gnd. After connecting all these things I run sudo i2cdetect -y 1 command its does not shows any more address connected to Rpi . Both the modules have internal pull up resistor
...
I²C is a master-slave protocol. That means one devices takes over the role of the master, and one (or multiple) devices connected to the I²C bus act as an I²C device.
In your case it seems like the raspberry pi is working as the master. To put the mbed device into I²C slave mode you have to instantiate one I2CSlave class.
Documentation and a tiny example is on the official site:
https://developer.mbed.org/users/mbed_official/code/mbed/docs/tip/classmbed_1_1I2CSlave.html