These three simple lines read a single row of data from the serial port. In the case of Raspberry Pi, the serial port (on my Arduino) is located at '/dev/ttyACM0'. You may also find yours there, or at an integer increment (ttyACM1, ttyACM2, etc.), or perhaps a different address completely. Check your Arduino IDE serial port for the exact location. Sending numeric values from Arduinos' Serial Monitor to the Arduino board can be tricky. In this video I explain the problem, and demonstrate some basic ways of solving it. To read more about the. I'm using two Arduinos to sent plain text strings to each other using newsoftserial and an RF transceiver. Each string is perhaps 20-30 characters in length. How do I convert Serial.read into a.
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Active6 years, 5 months ago
I have the following Arduino code.
If I open serial monitor and enter 00000001 I get the output
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OK, so firstly why 48 (and last line 49) and secondly why so many lines?
I was expecting to get the simple output of '1'.
If I change the line
dsolimanoSerial.println(b);
to Serial.println(00000001,DEC);
, I get exactly what I expect (that is, '1'). But if I change the line to Serial.println(b,DEC);
, I get the same strange output as before. 7,69233 gold badges4141 silver badges5757 bronze badges
coolblue2000coolblue2000Arduino Read Serial Data
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3 Answers
The 48 and 49 are decimal representations of '0' and '1'. It's printing 8 lines because you're calling Serial.println in a loop.
What exactly is your end goal? Serial.read() is returning the character, not the value: http://arduino.cc/en/Serial/read
Hope this helps!
--Example:
gregbeatygregbeaty
You can simply resolve this by changing b = Serial.read() - '0'. This happens because the arduino is using decimal code, not char. Here is a conversion table: http://www.asciitable.com/.
Hope I helped.
MarcMarc
Arduino Serial Read Bytes Until
If I understand correctly you want to receive an ascii string '000001' and convert it to an integer. The following untested example will require a carriage return to indicate the end of the string.
Arduino Serial Readbytesuntil Example
JeffArduino Serial Read Byte Chart
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Posted by6 years ago
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I am using a Arduino Uno. I am experiencing weird behavior with Serial.readbytes(); The arduino is powered and communicating via USB on COM4, I am running eclipse on 64bit win7.
My currently Arduino code looks like this, the delays are so I can start and stop my java service and look at the serial window in the Arduino IDE, in is a char array; Code:
Here is the relevant code for my java side. I modified it from, http://rxtx.qbang.org/wiki/index.php/Two_way_communcation_with_the_serial_port Code:
}
When I run it my arduino just prints out a blank line. If I prep the arduino with 'hiya' using the Serial window first, the when the java is executed it will return back to a blank line. Since the char array is just over-written each time I sent 'H567rn' and then in the Serial window typed sent 'hiya' where the extra newline was still being executed so I know characters are being stored somehow. Another test was to change the last Serial.prinln() to 'Serial.println(in[0], DEC)'. Using the Serial Window results happen as expected, but from java it just prints out '0' Serial communication works wonderful coming from the arduino talking to the java, just not from java to the arduino. Any insight would be wonderful!
Operating system: Windows 7,8,8.1. Hard disk: 1GB. Minecraft free download offline version. RAM ( Memory ): 1GBRecommended requirement of system.
/Edit, per suggestion I tried reading Serial.available() instead of a fixed max of 10, No changes were experienced.
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