Hello All Arduino-ers,
I am trying to program my Arduino Standalone(http://arduino.cc/en/Main/StandaloneAssembly) through rs232, how do I do this (treat me as being as nooby as my username would suggest in your explanations)
-l3378055
There is a simple solution for this: Buy a USB-to-TTL-serial-adapter from Ebay. Connect it to RX and TX.
Or use an Arduino with a serial adapter included.
I have a USB-rs232 connector already.
Is it TTL-level, or a higher voltage RS-232 level signals ?
I'm not sure, I bought it on Amazon, here is all the info on it.
USB to Serial RS-232 DB9 Adapter Cable
Product Features
Converts a USB port into a 9-pin male RS-232 serial port
Powered by USB port
Supports Windows 98/2000/Me/ XP, Mac OS(8.6/9.0)
It's perfect for PDA, DIGITAL CAMERA, MODEM and MOBILE PHONES.
Technical Details
Brand Name: DekCell
Model: undefined
Item Package Quantity: 1
Heres a link: http://www.amazon.com/gp/product/B000BI95W0/ref=pd_rate_rs
I see.
It is easier to have a adapter from USB directly to TTL-level serial lines.
The old RS-232 uses higher voltages.
Adafruit has both of them, with some explanation:
(1) USB/Serial Converter [FT232RL] : ID 18 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
(2) FTDI Serial TTL-232 USB Cable : ID 70 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
If you did build that stand-alone, the 7404 is probably used to be able to handle that higher voltage.
I hope you read the comments for this schematic: http://arduino.cc/en/Main/StandaloneAssembly
The RXD is an input, so the 7404 port for RXD is drawn the other way around. Also the /RESET is wrong and there are more problems. So the schematic is a total mess.
Perhaps it's better to start all over again.
Do you have a bootloader programmed ?
Can you upload your schematic (and a photo) ?
Did you already use a normal Arduino ? Building one yourself is easier if you already have used one.
T`hank you for all you have said so far,
I've built my circuit on a breadboard and it works, the Arduino and everything, if I program the Arduino through the Arduino Uno board. All that happens when I plug it into my computer is it says it cannot install the driver software(I have the software necessary to use the Arduino Uno).
Picture-wise it looks just like the one from the link I gave.
Could you elaborate on the problems in the circuit from the link?
That cable wants to put out ~+/-10V signals on the Tx line that would connect to your Rx, and expects your Tx pin to output +/-10V signals.
The ATMega328 on the board only handles 0/5V signals. Higher than 5.5 and lower than -0.5 will damage the IO pins.
If you're on a breadboard, then add a MAX232 type chip to handle the signal level conversion.
http://www.dipmicro.com/store/ST232CN
Need 5 0.1uF caps to create the +/-10V signal outputs that the cable needs.