user34363: i want to upload sketch into arduino uno using usb/ttl adapter.i tried searching for it, but found about programming arduino using another. can anyone help me.

user3879: The Uno is normally programmed by its on-board USB adapter.
The Pro Mini does not have an on-board adapter, and is normally programmed with an external USB/serial adapter. This should also be possible with Uno.

user1576: The Arduino onboard USB to serial is connected to D0 (Rx) and D1 (Tx).
And without a USB connected to the Arduino you can use a USB/TTL adapter connected to D0 and D1 like this;
Arduino  - USB/TTL
Tx       - Rx
Rx       - Tx

And to get the Arduino inte "programming" mode:

Automatic way, if the USB/TTL have CTS, connect it to Arduinos reset pin.
Manual way, press the reset button when the Arduino IDE starts to upload the code.


34363: <p>i want to upload sketch into arduino uno using usb/ttl adapter.i tried searching for it, but found about programming arduino using another. can anyone help me.</p>
 3879: <p>The Uno is normally programmed by its on-board USB adapter.</p>

<p>The Pro Mini does not have an on-board adapter, and is normally programmed with an external USB/serial adapter. This should also be possible with Uno.</p>
 1576: <p>The Arduino onboard USB to serial is connected to D0 (Rx) and D1 (Tx).</p>

<p>And without a USB connected to the Arduino you can use a USB/TTL adapter connected to D0 and D1 like this;</p>

<pre><code>Arduino  - USB/TTL
Tx       - Rx
Rx       - Tx
</code></pre>

<p>And to get the Arduino inte "programming" mode:</p>

<ul>
<li>Automatic way, if the USB/TTL have CTS, connect it to Arduinos reset pin.</li>
<li>Manual way, press the reset button when the Arduino IDE starts to upload the code.</li>
</ul>
