user7806: I want to customize an RC car that I have because the controller is gone. I'm going to use an Arduino with a custom motor controller but I have no idea what to use for the transmitter/receiver. I've seen some IR sensors being used but I want something that uses a frequency channel. Has anyone had experience doing this? What is the easiest way to go about accomplishing a remote controlled Arduino car? 

user6740: That depends largely what is controlling it
Some options include:

wifi, if you have an expansion board, from a PC or phone (spec says: 66ft/20m)
bluetooth works great, directly from your phone (spec says: 32ft/10m - 320ft/100m)
433mhz ASK transmitter/receiver from another Arduino or other hand-designed circuit (spec says: 100m/320ft)
Infrared receiver - from a TV remote! (range unknown, depends on remote & conditions; would not trust it 10m outside without testing).
Cellphone network - longest range (nationwide!). If you get a cheap android to do some of the work, you can use the phone's compass & gps & extra processing power, as well as the camera(s)!
Remote control. I know you said you lost yours, but in case someone else is looking here, you can hook up an rc receiver to an Arduino fairly easily. https://www.sparkfun.com/tutorials/348 for more info.

Many of these ranges specified will depend on the antenna. If your car can tell it's lost signal, then it can stop; otherwise you have to outrun it, or wait for it to hit a wall.
Edited to include cellphone network, and added ranges to options

user7942: Here is a link to a pair of Arduino compatible wireless transceivers. One of the listed applications in the description is "remote control systems such as RC vehicles," so I think this product would suit your project well.
According to the reviews / answers to questions on Amazon, the transceivers have an reliable range of just around 120 feet, so this component would be entirely appropriate in a remote-controlled build.

7806: <p>I want to customize an RC car that I have because the controller is gone. I'm going to use an Arduino with a custom motor controller but I have no idea what to use for the transmitter/receiver. I've seen some IR sensors being used but I want something that uses a frequency channel. Has anyone had experience doing this? What is the easiest way to go about accomplishing a remote controlled Arduino car? </p>
 6740: <p>That depends largely what is controlling it</p>

<p>Some options include:</p>

<ul>
<li>wifi, if you have an expansion board, from a PC or phone (spec says: 66ft/20m)</li>
<li>bluetooth works great, directly from your phone (spec says: 32ft/10m - 320ft/100m)</li>
<li>433mhz ASK transmitter/receiver from another Arduino or other hand-designed circuit (spec says: 100m/320ft)</li>
<li>Infrared receiver - from a TV remote! (range unknown, depends on remote &amp; conditions; would not trust it 10m outside without testing).</li>
<li>Cellphone network - longest range (nationwide!). If you get a cheap android to do some of the work, you can use the phone's compass &amp; gps &amp; extra processing power, as well as the camera(s)!</li>
<li>Remote control. I know you said you lost yours, but in case someone else is looking here, you can hook up an rc receiver to an Arduino fairly easily. <a href="https://www.sparkfun.com/tutorials/348" rel="nofollow">https://www.sparkfun.com/tutorials/348</a> for more info.</li>
</ul>

<p>Many of these ranges specified will depend on the antenna. If your car can tell it's lost signal, then it can stop; otherwise you have to outrun it, or wait for it to hit a wall.</p>

<p>Edited to include cellphone network, and added ranges to options</p>
 7942: <p><a href="http://rads.stackoverflow.com/amzn/click/B00E594ZX0" rel="nofollow">Here</a> is a link to a pair of Arduino compatible wireless transceivers. One of the listed applications in the description is "remote control systems such as RC vehicles," so I think this product would suit your project well.</p>

<p>According to the reviews / answers to questions on Amazon, the transceivers have an reliable range of just around 120 feet, so this component would be entirely appropriate in a remote-controlled build.</p>
