I have an Intel Edison with the mini breakout board. I have connected a USB cable to the J3 connector and I see the serial device, FT232R USB UART, on my computer. But when I try to connect using screen /dev/tty.usbserial-A502LTL3 115200 -L I get a blank screen. It seems like the Edison is not on.
You need to connect a USB cable to the J16 connector as well. The J16 USB port provides power to the Edison board. The other one, J3, is only for serial access - it does not power the board.
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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'm just bought a new Raspberry Pi 3 (and also 5V,2.5A Power Supply). And I'm totally a fresher to this so before to start using it I have some few question about its power.
I'm now connect my Pi with:
1. 1 Screen Monitor (Powered with another Power Supply) connecting through HDMI.
2. 1 Keyboard (USB port).
3. 1 Mouse (USB port).
4. 1 External Drive WD My Passport Ultra (with 3.0 USB cable) (USB port).
My question is does my Pi have enough power to handle all this above mentioned devices and if it is, can I use one more USB port for another device such as WD Passport and GPIO for a radiator fan ?.
Thank you for all your helps.
When your Pi will have not enough power for all peripherals you will see small yellow flash on screen. Then you should upgrade your power supply.
I have install OS in SD card and after installation OS is boot successfully but display below message every time:
http://prntscr.com/fbhj3j
I did not connect LAN cable raspberry board.
If this issue is because I cannot connect internet using wifi? If yes, how?
You need to continue to follow the instructions here: https://developer.android.com/things/hardware/raspberrypi.html
A Raspberry Pi will not connect to the Wifi if you have not first connected to an ethernet lan cable first. (Once you are connected via ethernet you then can configure the wifi and finally remove the ethernet cable).
So you are up to this step:
Connect an Ethernet cable to your local network.
When this is connected, your screen will show the IP address of the Raspberyy Pi on your local network
I bought a new Arduino Ethernet Shield and hooked it to the Arduino Uno.
I am trying to set the IP address of the device to 192.168.1.177 tried File-> Examples -> Ethernet-> Webserver.
When I upload this - I get a "server is a 0.0.0.0'message in serial monitor !
My IP is set to 192.168.1.177 and setup a mac address of 0xB8, 0x27, 0xEB, 0x98, 0x46, 0x61 in the webserver code.
Appreciate any help in setting this IP address. ( I tried other combinations as well )
The Arduino Ethernet shield is mounted on the Arduino Uno, and connections are lined up .
i fix this problem by pressing firmly the shield to the board
This can manifest from many different causes. I ran into this and figured out that in my case, my the USB port + cable were not allowing sufficient power to the Ethernet chip.
I have 3 cables, 6in, 3ft, and 6ft. Only the 6" one had sufficiently low voltage drop to power the shield.
I honestly couldn't believe it, but there was a 0.1V drop between the 6in and the 6ft cables. When plugged into A USB 3.0 port with the Arduino loaded, I measured ~4.5V for the working 6in cable vs ~4.4V for the non-working 6ft cable.
I have 3 types of USB ports: 1.1, 2.0, and 3.0. Only the USB 3.0 ports provided enough power to power the shield. Thus for my case, I had to use the shortest USB cable on the 3.0 port.
When the Arduino's 5V rail was sufficiently sagging, the 3.3 Linear Regulator entered dropout mode and on all the non-working configurations I saw ~3.1V on the Ethernet shield's 3.3V rail, which is apparently sufficient to cause this symptom.
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