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<title>UART at Raspberry Pi GPIO Pinout</title>
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<h1 class="logo"><a title="Raspberry Pi GPIO Pinout home" href="/"><img src="/resources/pinout-logo.png" width="45" height="45" />Raspberry Pi Pinout</a></h1>
<div id="leftcolumn">
<nav id="gpio">
<div id="pinbase"></div>
<ul class="bottom">
<li class="pin1 pow3v3"><a href="/pinout/3v3_power" title=""><span class="default"><span class="phys">1</span> 3v3 Power</span><span class="pin"></span></a></li>
<li class="pin3 gpio i2c overlay-pin"><a href="/pinout/pin3_gpio2" title="Wiring Pi pin 8"><span class="default"><span class="phys">3</span> <span class="name">GPIO 2</span> <small>(CTS / Clear to Send)</small></span><span class="pin"></span></a></li>
<li class="pin5 gpio i2c overlay-pin"><a href="/pinout/pin5_gpio3" title="Wiring Pi pin 9"><span class="default"><span class="phys">5</span> <span class="name">GPIO 3</span> <small>(RTS / Request to Send)</small></span><span class="pin"></span></a></li>
<li class="pin7 gpio overlay-pin"><a href="/pinout/pin7_gpio4" title="Wiring Pi pin 7"><span class="default"><span class="phys">7</span> <span class="name">GPIO 4</span> <small>(TXD / Transmit)</small></span><span class="pin"></span></a></li>
<li class="pin9 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">9</span> Ground</span><span class="pin"></span></a></li>
<li class="pin11 gpio overlay-pin"><a href="/pinout/pin11_gpio17" title="Wiring Pi pin 0"><span class="default"><span class="phys">11</span> <span class="name">GPIO 17</span> <small>(RTS / Request to Send)</small></span><span class="pin"></span></a></li>
<li class="pin13 gpio"><a href="/pinout/pin13_gpio27" title="Wiring Pi pin 2"><span class="default"><span class="phys">13</span> <span class="name">GPIO 27</span></span><span class="pin"></span></a></li>
<li class="pin15 gpio"><a href="/pinout/pin15_gpio22" title="Wiring Pi pin 3"><span class="default"><span class="phys">15</span> <span class="name">GPIO 22</span></span><span class="pin"></span></a></li>
<li class="pin17 pow3v3"><a href="/pinout/3v3_power" title=""><span class="default"><span class="phys">17</span> 3v3 Power</span><span class="pin"></span></a></li>
<li class="pin19 gpio spi overlay-pin"><a href="/pinout/pin19_gpio10" title="Wiring Pi pin 12"><span class="default"><span class="phys">19</span> <span class="name">GPIO 10</span> <small>(CTS / Clear to Send)</small></span><span class="pin"></span></a></li>
<li class="pin21 gpio spi overlay-pin"><a href="/pinout/pin21_gpio9" title="Wiring Pi pin 13"><span class="default"><span class="phys">21</span> <span class="name">GPIO 9</span> <small>(RXD / Receive)</small></span><span class="pin"></span></a></li>
<li class="pin23 gpio spi overlay-pin"><a href="/pinout/pin23_gpio11" title="Wiring Pi pin 14"><span class="default"><span class="phys">23</span> <span class="name">GPIO 11</span> <small>(RTS / Request to Send)</small></span><span class="pin"></span></a></li>
<li class="pin25 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">25</span> Ground</span><span class="pin"></span></a></li>
<li class="pin27 gpio i2c overlay-pin"><a href="/pinout/pin27_gpio0" title="Wiring Pi pin 30"><span class="default"><span class="phys">27</span> <span class="name">GPIO 0</span> <small>(TXD / Transmit)</small></span><span class="pin"></span></a></li>
<li class="pin29 gpio overlay-pin"><a href="/pinout/pin29_gpio5" title="Wiring Pi pin 21"><span class="default"><span class="phys">29</span> <span class="name">GPIO 5</span> <small>(RXD / Receive)</small></span><span class="pin"></span></a></li>
<li class="pin31 gpio overlay-pin"><a href="/pinout/pin31_gpio6" title="Wiring Pi pin 22"><span class="default"><span class="phys">31</span> <span class="name">GPIO 6</span> <small>(CTS / Clear to Send)</small></span><span class="pin"></span></a></li>
<li class="pin33 gpio overlay-pin"><a href="/pinout/pin33_gpio13" title="Wiring Pi pin 23"><span class="default"><span class="phys">33</span> <span class="name">GPIO 13</span> <small>(RXD / Receive)</small></span><span class="pin"></span></a></li>
<li class="pin35 gpio pcm"><a href="/pinout/pin35_gpio19" title="Wiring Pi pin 24"><span class="default"><span class="phys">35</span> <span class="name">GPIO 19</span> <small>(PCM FS)</small></span><span class="pin"></span></a></li>
<li class="pin37 gpio"><a href="/pinout/pin37_gpio26" title="Wiring Pi pin 25"><span class="default"><span class="phys">37</span> <span class="name">GPIO 26</span></span><span class="pin"></span></a></li>
<li class="pin39 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">39</span> Ground</span><span class="pin"></span></a></li>
</ul>
<ul class="top">
<li class="pin2 pow5v"><a href="/pinout/5v_power" title=""><span class="default"><span class="phys">2</span> 5v Power</span><span class="pin"></span></a></li>
<li class="pin4 pow5v"><a href="/pinout/5v_power" title=""><span class="default"><span class="phys">4</span> 5v Power</span><span class="pin"></span></a></li>
<li class="pin6 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">6</span> Ground</span><span class="pin"></span></a></li>
<li class="pin8 gpio uart overlay-pin"><a href="/pinout/pin8_gpio14" title="Wiring Pi pin 15"><span class="default"><span class="phys">8</span> <span class="name">GPIO 14</span> <small>(TXD / Transmit)</small></span><span class="pin"></span></a></li>
<li class="pin10 gpio uart overlay-pin"><a href="/pinout/pin10_gpio15" title="Wiring Pi pin 16"><span class="default"><span class="phys">10</span> <span class="name">GPIO 15</span> <small>(RXD / Receive)</small></span><span class="pin"></span></a></li>
<li class="pin12 gpio pcm"><a href="/pinout/pin12_gpio18" title="Wiring Pi pin 1"><span class="default"><span class="phys">12</span> <span class="name">GPIO 18</span> <small>(PCM CLK)</small></span><span class="pin"></span></a></li>
<li class="pin14 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">14</span> Ground</span><span class="pin"></span></a></li>
<li class="pin16 gpio"><a href="/pinout/pin16_gpio23" title="Wiring Pi pin 4"><span class="default"><span class="phys">16</span> <span class="name">GPIO 23</span></span><span class="pin"></span></a></li>
<li class="pin18 gpio"><a href="/pinout/pin18_gpio24" title="Wiring Pi pin 5"><span class="default"><span class="phys">18</span> <span class="name">GPIO 24</span></span><span class="pin"></span></a></li>
<li class="pin20 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">20</span> Ground</span><span class="pin"></span></a></li>
<li class="pin22 gpio"><a href="/pinout/pin22_gpio25" title="Wiring Pi pin 6"><span class="default"><span class="phys">22</span> <span class="name">GPIO 25</span></span><span class="pin"></span></a></li>
<li class="pin24 gpio spi overlay-pin"><a href="/pinout/pin24_gpio8" title="Wiring Pi pin 10"><span class="default"><span class="phys">24</span> <span class="name">GPIO 8</span> <small>(TXD / Transmit)</small></span><span class="pin"></span></a></li>
<li class="pin26 gpio spi overlay-pin"><a href="/pinout/pin26_gpio7" title="Wiring Pi pin 11"><span class="default"><span class="phys">26</span> <span class="name">GPIO 7</span> <small>(RTS / Request to Send)</small></span><span class="pin"></span></a></li>
<li class="pin28 gpio i2c overlay-pin"><a href="/pinout/pin28_gpio1" title="Wiring Pi pin 31"><span class="default"><span class="phys">28</span> <span class="name">GPIO 1</span> <small>(RXD / Receive)</small></span><span class="pin"></span></a></li>
<li class="pin30 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">30</span> Ground</span><span class="pin"></span></a></li>
<li class="pin32 gpio overlay-pin"><a href="/pinout/pin32_gpio12" title="Wiring Pi pin 26"><span class="default"><span class="phys">32</span> <span class="name">GPIO 12</span> <small>(TXD / Transmit)</small></span><span class="pin"></span></a></li>
<li class="pin34 gnd"><a href="/pinout/ground" title=""><span class="default"><span class="phys">34</span> Ground</span><span class="pin"></span></a></li>
<li class="pin36 gpio overlay-pin"><a href="/pinout/pin36_gpio16" title="Wiring Pi pin 27"><span class="default"><span class="phys">36</span> <span class="name">GPIO 16</span> <small>(CTS / Clear to Send)</small></span><span class="pin"></span></a></li>
<li class="pin38 gpio pcm"><a href="/pinout/pin38_gpio20" title="Wiring Pi pin 28"><span class="default"><span class="phys">38</span> <span class="name">GPIO 20</span> <small>(PCM DIN)</small></span><span class="pin"></span></a></li>
<li class="pin40 gpio pcm"><a href="/pinout/pin40_gpio21" title="Wiring Pi pin 29"><span class="default"><span class="phys">40</span> <span class="name">GPIO 21</span> <small>(PCM DOUT)</small></span><span class="pin"></span></a></li>
</ul>
</nav>
<div id="legend">
<div>
<h2>Legend</h2>
<p>Orientate your Pi with the GPIO on the right and the HDMI port(s) on the left.</p>
<ul>
<li class="gpio">
<a href="/pinout/wiringpi" title="GPIO (General Purpose IO)">
<span class="default"></span>
<span class="pin"></span> GPIO <small>(General Purpose IO)</small>
</a>
</li>
<li class="spi">
<a href="/pinout/spi" title="SPI (Serial Peripheral Interface)">
<span class="default"></span>
<span class="pin"></span> SPI <small>(Serial Peripheral Interface)</small>
</a>
</li>
<li class="i2c">
<a href="/pinout/i2c" title="I2C (Inter-integrated Circuit)">
<span class="default"></span>
<span class="pin"></span> I<sup>2</sup>C <small>(Inter-integrated Circuit)</small>
</a>
</li>
<li class="uart">
<a href="/pinout/uart" title="UART (Universal Asynchronous Receiver/Transmitter)">
<span class="default"></span>
<span class="pin"></span> UART <small>(Universal Asynchronous Receiver/Transmitter)</small>
</a>
</li>
<li class="pcm">
<a href="/pinout/pcm" title="PCM (Pulse Code Modulation)">
<span class="default"></span>
<span class="pin"></span> PCM <small>(Pulse Code Modulation)</small>
</a>
</li>
<li class="gnd">
<a href="/pinout/ground" title="Ground">
<span class="default"></span>
<span class="pin"></span> Ground
</a>
</li>
<li class="pow5v">
<a href="/pinout/5v_power" title="5v (Power)">
<span class="default"></span>
<span class="pin"></span> 5v <small>(Power)</small>
</a>
</li>
<li class="pow3v3">
<a href="/pinout/3v3_power" title="3.3v (Power)">
<span class="default"></span>
<span class="pin"></span> 3.3v <small>(Power)</small>
</a>
</li>
</ul>
</div>
<img src="/resources/pi-orientation.png" width="196" height="297" />
</div>
</div>
<div id="content">
<div id="interfaces">
<ul>
<li><a href="/pinout/gpclk">GPCLK</a></li><li><a href="/pinout/1_wire">1-WIRE</a></li><li><a href="/pinout/3v3_power">3v3 Power</a></li><li><a href="/pinout/pcm">PCM</a></li><li><a href="/pinout/ground">Ground</a></li><li><a href="/pinout/spi">SPI</a></li><li><a href="/pinout/wiringpi">WiringPi</a></li><li><a href="/pinout/jtag">JTAG</a></li><li><a href="/pinout/5v_power">5v Power</a></li><li><a href="/pinout/sdio">SDIO</a></li><li class="selected"><a href="/pinout/uart">UART</a></li><li><a href="/pinout/pwm">PWM</a></li><li><a href="/pinout/i2c">I2C</a></li><li><a href="/pinout/dpi">DPI</a></li>
</ul>
</div>
<div id="crumbtrail"><p><a class="more" href="/boards">Browse pinouts for HATs, pHATs and add-ons &raquo;</a></p></div>
<div id="featured">
<ul>
</ul>
</div>
<article class="page_uart"><h1>UART - Universal Asynchronous Receiver/Transmitter</h1>
<hr />
<h3>UART pins in BCM mode are: 14, 15</h3>
<h3>UART pins in WiringPi are: 15, 16</h3>
<hr />
<p>UART is an asynchronous serial communication protocol, meaning that it takes bytes of data and transmits the individual bits in a sequential fashion.</p>
<p>Asynchronous transmission allows data to be transmitted without the sender having to send a clock signal to the receiver. Instead, the sender and receiver agree on timing parameters in advance and special bits called 'start bits' are added to each word and used to synchronize the sending and receiving units.</p>
<p>UART is commonly used on the Pi as a convenient way to control it over the GPIO, or access the kernel boot messages from the serial console (enabled by default).</p>
<p>It can also be used as a way to interface an Arduino, bootloaded ATmega, ESP8266, etc with your Pi. Be careful with logic-levels between the devices though, for example the Pi is 3.3v and the Arduino is 5v. Connect the two and you might conjure up some magic blue smoke.</p>
<p>Raspberry Pi 2/3 have two UARTs, uart1 and uart0. Raspberry Pi 4 has four additional UARTs available. Only uart0/1 is enabled over GPIO pin 14/15 by default. The additional UARTs can be enabled through the device tree overlays.</p>
<p>Assuming you have WiringPi-Python installed, the following python example opens the Pi's UART at 9600baud and puts 'hello world'</p>
<pre><code class="language-python">import wiringpi
wiringpi.wiringPiSetup()
serial = wiringpi.serialOpen('/dev/ttyAMA0',9600)
wiringpi.serialPuts(serial,'hello world!')
</code></pre>
<table class="details"><tr><td><h2>Details</h2><ul>
<li>18 pin header</li>
<li>Uses 18 GPIO pins</li>
<li><a href="http://elinux.org/RPi_Serial_Connection">More Information</a></li>
</ul></td><td></td></tr></table></article>
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