Raspberry pi and arduino

[raspberrypibeginer]

Hello,can I use the arduino as serial to usb for the raspberry pi,for program it without a screen,please help me

[topguy]

Hello,can I use the arduino as serial to usb for the raspberry pi,for program it without a screen,please help me

You want to program the Arduino or the Raspberry ??
I think you should try to explain a little more in detail what you want to try to do.

[raspberrypibeginer]

I want to program raspberry pi

[mikronauts]

No.

Your best bet is get the Pi set up with screen & keyboard, then install xrdp, and use remmina or other tablet/desktop/notebook rdp client to connect to the Pi.

Hello,can I use the arduino as serial to usb for the raspberry pi,for program it without a screen,please help me

[RetiredProgrammer]

Hello,can I use the arduino as serial to usb for the raspberry pi,for program it without a screen,please help me

Yes- I am doing the same thing. Windows laptop running remote desktop to RPi (running vncserver) with Arduino attached to RPi via USB. Run the Arduino via the Arduino IDE and activate the serial monitor in the IDE. Serial.print in your Arduino sketch will appear on your remote desk top.

A couple items to be aware of: Be sure you have the right board selected in the Arduino IDE and be sure the speed of Serial is the same in your sketch and in the serial monitor.

[raspberrypibeginer]

retired programer,can you teach me how to do it

[raspberrypibeginer]

I think that you dont understand me,I tried to say if I can conect arduino via tx,rx,gnd an the arduino to mi laptop

[raspberrypibeginer]

And if i cant do it with arduino,can anyone explain me how to use my laptop internet connection to use it with RPi via RJ45,because i dont have wifi dongle

[DougieLawson]

And if i cant do it with arduino,can anyone explain me how to use my laptop internet connection to use it with RPi via RJ45,because i dont have wifi dongle

That's the easier option. Just bridge the connections on your laptop and wire the two together. Nothing special needed on the RPi for internet connection sharing.

[liudr]

Trying to help and understand your issues here. You have raspberry pi and arduino is connected to raspberry pi TX RX GND? That alone won't work. Raspberry pi serial pins are 3.3v logic and arduino 5v. Plus, you need 5v from raspberry pi to arduino. What kind of project are you doing?

[raspberrypibeginer]

Its a project that i need to program it without a screen,because i dont have screen

[pluggy]

Its two largely unrelated problems. You can connect the Pi to your router with the ethernet port and use SSH/VNC/Whatever to control / program /whatever the Pi from your existing computer. You can connect the Pi to the Arduino using USB or using the Pi's TTY serial on the GPIO pins to connect to the Arduino's TX/RX/Gnd. If you're using TX RX, you can connect the GND directly betwwen the Pi and the Arduino, The Pi's TX can be connected to the Arduino's RX directly, The Arduino TX must be reduced to 3.3 volts to connect to the Pi's RX, several ways of doing this, but the easiest is probably a voltage divider, which is what I use on my setup. I use a 10k and 18k resistor, but many values will work if the ratio is about right.

[raspberrypibeginer]

but,can I convert the 5v to 3,3v with three 10k resistor,i'm correct?

[raspberrypibeginer]

the think im trying to say is if i can use arduino uno as serial to usb,because i think if you can conect tx,rx,gnd and power RPi and connect the arduino to the PC you can use a serial comunication,if i can reduce the voltage with resistor,this i think work perfectly but i don't know,if i'm not explain good is because i'm spanish,and i'm 13 years old,i'm entering to the electronics world

[panik]

So you want to use the Arduino as if it was an FTDI cable or similar to log into the Pi from your computer using serial? That's good thinking actually, pretty smart! There is USB CDC functionality available on the Arduino Uno. So why not use it?

Unfortunately, the Arduino (Uno) uses the 'Serial' class for both the USB CDC and the RX/TX on the D0 and D1 pins. So I'm afraid that's not possible.

If your Arduino was a Leonardo it's possible to pass data back and forth between 'Serial1' (pins D0 and D1) and 'Serial' (USB CDC). All this after you handled the 5V-3.3V conversion of course.

Your best bet now is probably to SSH into the Pi using your LAN network. Or connect directly as @DougieLawson suggests.

[pluggy]

but,can I convert the 5v to 3,3v with three 10k resistor,i'm correct?

Yes 3 10k resistors would work.

[DougieLawson]

but,can I convert the 5v to 3,3v with three 10k resistor,i'm correct?

Yes you can two 10K (R1) resistors in series makes 20K (R2).
signal ----[10K]--- *GPIO pin* ---[10K]---[10K]---GND

[pluggy]

it would almost certainly work with 2 10k resistors. 2.5 V would probably flag as a logic 1 on 3.3 volts

[raspberrypibeginer]

thanks to all,last question is if i can connect it with an RJ45 to a laptop and dont use internet connection to use an ssh server,like arduino,you plug it the RJ45 and you can use it without internet only command line

[panik]

Unfortunately, the Arduino (Uno) uses the 'Serial' class for both the USB CDC and the RX/TX on the D0 and D1 pins. So I'm afraid that's not possible.

After a meal and a second thought; you could use only the USB-serial part of the Arduino and bypass the ATmega328 completely.

Remove it from its socket so it doesn't interfere. Connect RX and TX from the Pi to pin D0 and D1 on the header (with the voltage divider). It's directly[*] connected to the ATmega8U2 on the Arduino board that does the USB-serial (it's an FTDI chip on older Arduinos). Should work in theory.

[*] Edit: there are two 1K resistors as well. See the schematic: http://arduino.cc/en/uploads/Main/ardui ... ematic.pdf

Edit2: Sorry for not answering your question. Probably yes, but I hope/think other people are able to give better comments on that. SSH is probably the easiest. I just think your original question (and proposed solution) was interesting.

[RetiredProgrammer]

And if i cant do it with arduino,can anyone explain me how to use my laptop internet connection to use it with RPi via RJ45,because i dont have wifi dongle

You can connect your RPi and your laptop with an Ethernet cable if you have an Ethernet connector on your laptop