16 lines
960 B
Markdown
16 lines
960 B
Markdown
#UART - Universal Asynchronous Receiver/Transmitter
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###The 2 UART pins in WiringPi are: 15, 16
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UART is a handy, straight forward way to interface an Arduino ( or bootloaded ATmega ) with your Pi. You must, however, be careful with logic-levels between the two devices: the Pi is 3.3v and the Arduino is 5v. Connect the two and you might conjure up some magic blue smoke.
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Personally I'm a fan of building out a Arduino Bootloaded ATmega 328 circuit on a breadboard with a voltage regulator to take the Pi's 5v line and convert it to 3.3v. The ATmega 328 seems to run quite happily at 3.3v using a 16Mhz crystal and you'll then have an Arduino clone with 3.3v logic.
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Assuming you have WiringPi2-Python installed, the following python example opens the Pi's UART at 9600baud and puts 'hello world'
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```python
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import wiringpi2 as wiringpi
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wiringpi.wiringPiSetup()
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serial = wiringpi.serialOpen('/dev/ttyAMA0',9600)
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wiringpi.serialPuts(serial,'hello world!')
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``` |