To the communication serial of the arduino mega, I have that connect a max232 or the arduino already it has?
Do pins which connect the max232 db15 connector?
Many thanks for your help
(google translate)
The serial ports an the Mega are TTL level, not RS232
Mega schematic; found via the Mega product page
sterretje:
The serial ports an the Mega are TTL level, not RS232Mega schematic; found via the Mega product page
That mean that I can connect them pin tx, rx without need of a max232?
Many thanks for your response. Good day / night.
I need to send data by the RS232 port, through the pines RX1... n, TX1... n; can I do it directly without using the MAX232?
Arduino - serial converter (MAX232) - computer RS232.
Arduino has TTL signal level. It cannot be connected directly to the computer. You will need level converter based on MAX232 or similar.
Hello, I want to transfer data from the Arduino to the computer.
But before I want to say, that my arduino mega, will be constantly fed with 7v.
My question is that if to send data, can I use a connector (USB-to-DB9 CONNECTOR) as shown in the image (this is to avoid using a max232 in the ports of the arduino)?
my other question is that if I use the USB-to-DB9 connector, I don't get any extra power that harms my arduino. This is because to my arduino is powered with a supply voltage of 7v.
(translate.google)
DB9 also has a Ground connection, on pin 5. Power is usually not supplied on any pin.
If you connect the DBP and leave the power supply off, the Arduino should not have power. Try it.
new99:
Hello, I want to transfer data from the Arduino to the computer.
So, you don't want to just transfer data from arduino to computer using direct USB connection between computer and arduino, right?
Do you specifically want to use RS232 as the middle guy?
Southpark:
So, you don't want to just transfer data from arduino to computer using direct USB connection between computer and arduino, right?Do you specifically want to use RS232 as the middle guy?
Not necessarily, I just want to transfer data from the arduino to the computer. The problem of making them from arduino USB to computer USB is that the computer supplies power to arduino.
And my arduino will be connected to a 7v volt source.
CrossRoads:
DB9 also has a Ground connection, on pin 5. Power is usually not supplied on any pin.
If you connect the DBP and leave the power supply off, the Arduino should not have power. Try it.
Hi, I need to send arduino data to the computer. Normally connected the arduino and the computer through USB works correctly but the problem is that through USB the computer supplies arduino electrical power.
My arduino is powered apart by a 7v voltage source.
How do I send data from the arduino to the computer without the computer supplying electrical power?
Please help, I'm new.
The Arduino has a built in power switch.
Your 7 volt to the power jack takes precedent over the USB 5v from the USB cable.
.
LarryD:
The Arduino has a built in power switch.
Your 7 volt to the power jack takes precedent over the USB 5v from the USB cable.
7volt on the DC socket is not enough to switch off USB power.
7.5volt (7.3) or more is needed for that.
Leo..
Maybe the OP is using Vin.
Maybe they are not measuring the voltage to the decimal.
.
LarryD:
Maybe the OP is using Vin.
Maybe they are not measuring the voltage to the decimal.
7volt on V-in would be above the switchpoint (2 * the 3.3volt pin), but the picture shows the DC socket as entry point.
Leo..
Perhaps the OP has some adjustment on that power supply potentiometer seen in the image I missed.
.
What would you do to send an arduino data to the computer? (So that the arduino is connected to a voltage source (because the project is going to be implemented in real life).
You shouldn't have started a new thread for the same thing.
Doing so confuses and wastes our time.
forum.arduino.cc/index.php?topic=432547.0
Why can't you just use a common USB lead to communicate with the computer, like everybody else does.
Leo..
Wawa:
Why can't you just use a common USB lead to communicate with the computer, like everybody else does.
Leo..
One problem might be that connecting the USB cable forces a reset. I know there is a work-around but not everybody is prepared to modify boards.
Distance might be a factor too, but I can't find any reason in this or in the other thread.
Leo..
@new99 - did you notice on that picture you posted that the USB connector on that cable is not the same sort of connector as the USB connector on the Arduino. You can not connect them.
new99:
What would you do to send an arduino data to the computer? (So that the arduino is connected to a voltage source (because the project is going to be implemented in real life).
I can't see what you are worrying about supplying 7V to to Vin of an Arduino has it regulated down to 5V before it gets to the Arduino. Just plug it in to the computer.