If I use the Arduino IDE's Serial monitor I can read the pair of comma separated values as below:
I want to first replicate this behavior in SciLab terminal. I used the Serial Communication Toolbox:
h = openserial(7, "9600,n,8,1") // open COM7
disp(readserial(h))
closeserial(h)
which returns either empty or
, 169
228, 179
228,
228, 205
228, 209 228,
putting the disp(readserial(h)) in a while loop also doesn't help. Not only there are too many empty lines, if I stop the while loop it does not close the port (something like try-catch should be used I think). I would appreciate if you could help me know how I could get the same behavior as Arduino's serial monitor?
P.S. Next I want to plot these two values in realtime. So maybe using the csvTextScan function to split the string into two integers.
OK, after a couple of days struggling I figured this out. It turns out that SciLab doesn't have native serial communication functionality and the Toolbox developer has used TCL_EvalStr to run Tcl commands externally. I had to dig into the Tcl serial communication syntax (i.e. read, open, gets, fconfigure ... ), ask another question, get some help and then finally end up with a new function for the Toolbox which I have committed as a pull request:
function buf = readserialline(h)
tmpbuf = emptystr();
while tmpbuf == emptystr()
TCL_EvalStr("gets " + h + " ttybuf");
tmpbuf = TCL_GetVar("ttybuf");
end
buf = tmpbuf;
endfunction
now one can get the above behavior by running:
h = openserial(7, "9600,n,8,1") // open COM7
for ii = 1:40
disp(readserialline(h))
end
closeserial(h)
to read the serial port line by line and print it to the SciLab console. Now to parse the CSV data you may use:
csvTextScan(part(readserialline(h), 1:$-1), ',')
P.S.1. I have used a virtual Arduino board inside SimulIDE and used com0com to create virtual serial ports. More information here on SourceForge.
P.S.2. More discussion with Toolbox developer Aditya Sengupta here on Twitter.
P.S.3. More discussions here on Tcl Google group
P.S.4. A full demonstration plus instructions here on Reddit
P.S.5. For those who might end up here, I have decided to rewrite Aditya Sengupta's repository here with several improvements.
Related
It was successful to train from jet son-XAVIER and recognize it as cam. But I don't know how to send the information that jet son-XAVIER recognized in real time to Arduino. The objects we recognize are elk and wild boar. I know that I can only send 1 letter through communication, so elk will send e and wild boar to w. Is there a way to send it as soon as it recognizes it through real-time web cam?
There's not a lot of information here on your setup, but here's a possible solution:
I see the NVIDIA Jetson AGX Xavier module has USB-C ports.
Buy a USB-A to USB-C cable, and plug the Arduino directly in.
I'm not sure what program/language you're using with your trained model, but I'll guess that it's python for now.
You'll want to open a Serial connection to the arduino, and you can do this with pyserial:
https://pypi.org/project/pyserial/
You can send more than just one letter, you can send entire data streams. But, if you want to just send one letter, it will do that as well.
Here's the official documentation for how to communicate with an Arduino using Python:
https://create.arduino.cc/projecthub/ansh2919/serial-communication-between-python-and-arduino-e7cce0
If you're not using python, specify your language of choice, and we can look up and see if it has a serial library.
I have never used darknet but may be this can point you in the right direction.
I have used the library sugested by Bucky and I believe you could add the serial comunication to darknet.py. This is what I would do:
#Add this import at begining of the file darknet.py
import serial
#########################################################
#this is a mocked version of detect in darknet.py, assuming that the labels you used are "elk" and "wildboard". You should not add this lines to the file.
def detect():
res = []
res.append(("elk",0.98,(2,2,50,50)))
res.append(("wildboard",0.98,(2,2,50,50)))
return res
r = detect()
##########################################################
#Add this after the 'print r' at the end of the file darknet.py
ser = serial.Serial('/dev/ttyUSB0') # open serial port. You should check what serial port is assigned to your arduino.
for obj in r:
if obj[0]=="elk" and obj[1]>=0.9: #assuming 0.9 as the minimum confident for a detection
print "found elk"
ser.write('e') # you can send a string with just one letter
elif obj[0]=="wildboard" and obj[1]>=0.9:
print "found wildboard";
ser.write('w') # you can send a string with just one letter
ser.close() # close port
I've designed a tachometer using an arduino setup and I get the output values(rpm), but since I don't have an wifi module, I've connected my arduino and raspberry pi 4 using usb. I can read the rpm value in the pi terminal. But now I need to send these data to an adafruit io page. How do I write the code to read the data from the usb port of my pi in real-time? I've written a script which can print it on the webpage but each time I've to write a value. It would be really helpful if i can get the answers. I'm new to coding and just exploring these.
from Adafruit_IO import*
ADAFRUIT_IO_USERNAME = '******'
ADAFRUIT_IO_KEY = '**********************'
aio = Client(ADAFRUIT_IO_USERNAME,ADAFRUIT_IO_KEY)
try:
test = aio.feeds('test')
except RequestError:
test_feed = Feed(name='test')
test_feed = aio.create_feed(test_feed)
val = 4
aio.send('test',val)
The below code is an example of what will work in Python, assuming your USB is connected at /dev/tty.usbmodem14201:
import serial
ser = serial.Serial('/dev/tty.usbmodem14201', baudrate=9600) # NB set your baudrate to the one you are using!
ser.flushInput()
while True: #constant loop to get readings in real time
ser_bytes = ser.readline() #read the incoming message
decoded_bytes = ser_bytes[0:len(ser_bytes)-2].decode("utf-8") #decode it
print(decoded_bytes) # print out what you got or, alternatively, make a web call to Adrafruit
I am using the following python script to write AT+CSQ on serial port ttyUSB1.
But I cannot read anything.
However, when I fire AT+CSQ on minicom, I get the required results.
What may be the issue with this script?
Logs:
Manual Script
root#imx6slzbha:~# python se.py
Serial is open
Serial is open in try block also
write data: AT+CSQ
read data:
read data:
read data:
read data:
Logs:
Minicom console
1. ate
OK
2. at+csq
+CSQ: 20,99
3. at+csq=?
OKSQ: (0-31,99),(99)
How can I receive these results in the following python script?
import serial, time
#initialization and open the port
#possible timeout values:
# 1. None: wait forever, block call
# 2. 0: non-blocking mode, return immediately
# 3. x, x is bigger than 0, float allowed, timeout block call
ser = serial.Serial()
ser.port = "/dev/ttyUSB1"
ser.baudrate = 115200
ser.bytesize = serial.EIGHTBITS #number of bits per bytes
ser.parity = serial.PARITY_NONE #set parity check: no parity
ser.stopbits = serial.STOPBITS_ONE #number of stop bits
ser.timeout = None #block read
#ser.timeout = 0 #non-block read
ser.timeout = 3 #timeout block read
ser.xonxoff = False #disable software flow control
ser.rtscts = False #disable hardware (RTS/CTS) flow control
ser.dsrdtr = False #disable hardware (DSR/DTR) flow control
ser.writeTimeout = 2 #timeout for write
try:
ser.open()
print("Serial is open")
except Exception, e:
print "error open serial port: " + str(e)
exit()
if ser.isOpen():
try:
print("Serial is open in try block also")
ser.flushInput() #flush input buffer, discarding all its contents
ser.flushOutput()#flush output buffer, aborting current output
#and discard all that is in buffer
#write data
ser.write("AT+CSQ")
time.sleep(1)
# ser.write("AT+CSQ=?x0D")
print("write data: AT+CSQ")
# print("write data: AT+CSQ=?x0D")
time.sleep(2) #give the serial port sometime to receive the data
numOfLines = 1
while True:
response = ser.readline()
print("read data: " + response)
numOfLines = numOfLines + 1
if (numOfLines >= 5):
break
ser.close()
except Exception, e1:
print "error communicating...: " + str(e1)
else:
print "cannot open serial port "
You have two very fundamental flaws in your AT command handling:
time.sleep(1)
and
if (numOfLines >= 5):
How bad are they? Nothing will ever work until you fix those, and by that I mean completely change the way you send and receive command and responses.
Sending AT commands to a modem is a communication protocol like any other protocols, where certain parts and behaviours are required and not optional. Just like you would not write a HTTP client that completely ignores the responses it gets back from the HTTP server, you must never write a program that sends AT commands to a modem and completely ignores the responses the modem sends back.
AT commands are a link layer protocol, with with a window size of 1 - one. Therefore after sending a command line, the sender MUST wait until has received a response from the modem that it is finished with processing the command line, and that kind of response is called Final result code.
If the modem uses 70ms before it responds with a final result code you have to wait at least 70ms before continuing, if it uses 4 seconds you have to wait at least 4 seconds before continuing, if it uses several minutes (and yes, there exists AT commands that can take minutes to complete) you have to wait for several minutes. If the modem has not responded in an hour, your only options are 1) continue waiting, 2) just give up or 3) disconnect, reconnect and start all over again.
This is why sleep is such a horrible approach that in the very best case is a time wasting ticking bomb. It is as useful as kicking dogs that stand in your way in order to get them to move. Yes it might actually work some times, but at some point you will be sorry for taking that approach...
And regarding numOfLines there is no way anyone in advance can know exactly how many lines a modem will respond with. What if your modem just responds with a single line with the ERROR final result code? The code will deadlock.
So this line number counting has to go completely away, and instead your code should be sending a command line and then wait for the final result code by reading and parsing the response lines from the modem.
But before diving too deep into that answer, start by reading the V.250 specification, at least all of chapter 5. This is the standard that defines the basics of AT command, and will for instance teach you the difference between a command and a command line. And how to correctly terminate a command line which you are not doing, so the modem will never start processing the commands you send.
I am having some issues getting stock code to compile for my 9 axes motion shield. I have a github repository with all of the motion libraries I have, the example code, and the error messages I am getting.
I am using Arduino 1.7.1 IDE on Windows 7 64-bit.
I have tried using sample code for the sensor instead of for the shield and could not get that to compile either. I have tested example code built into the IDE to ensure that I can compile something and I was even able to interface with my Arduino MEGA 2560 with said code.
I have searched Google and Stack exchange a fair bit and have not managed to come up with any solutions.
The main error I can not figure out is:
"
C:\Users\LJI_eric\Documents\Arduino\sketch_mar20a\sketch_mar20a.ino: In function 'void setup()':
sketch_mar20a:63: error: 'OPERATION_MODE_NDOF' was not declared in this scope
mySensor.setOperationMode(OPERATION_MODE_NDOF);"
OPERATION_MODE_NDOF is a mode that is defined in BNO055.h and is an array of operation modes. I tried several other modes to no avail.
I would appreciate any and all help.
On line 84, 87 and 91 you have made a new line inside a string. You can not do that on the Arduino. If you want to break a string up in more lines you should end the string where you would break it, and start the string again on the new line, like this.
Serial.println("Move the device around and then place it at one position.\n"
"Change the threshold and duration to increase the difficulty level.");
Then you should change OPERATION_MODE_NDOF to BNO055_OPERATION_MODE_NDOF
I am using ATmega128 and I need two serial ports for communication. I have been using printf from "stdio.h" header file to send data through USART 0. I also need to send data through USART 1 to lcd and I am curious about using formatted input function. I have been thinking that connecting same printf function to USART 1 and USART 0 makes the compiler confused so I haven't tried it.
Can anyone suggest how to make another printf say "Lprintf" to send data through USART 1 ??
What you want to do here is to use fprintf(). See the documentation on avr-libc for the function. Essentially, you want to have a fputc() function for UART1 and one for UART0. Then, based on that, you can create two FILE buffers. Once you do so, you are free to use fprintf() on each. Optionally, you can point stdout to one of these buffers, as to be able to use printf().
FILE uart1_out = FDEV_SETUP_STREAM(uart1_putc, 0, _FDEV_SETUP_WRITE);
FILE uart0_out = FDEV_SETUP_STREAM(uart0_putc, 0, _FDEV_SETUP_WRITE);
fprintf(&uart1_out, "printing to UART1");
fprintf(&uart0_out, "printing %d to UART0", 0);
stdout = &uart1_out;
stderr = &uart0_out;
printf("This string will be printed thru UART1");
fprintf(stderr, "This string will be printed thru UART0");
You just need to provide the implementation for int uart1_putc(int, FILE*) and int uart0_putc(int, FILE*) to manipulate data as you wish.
Hope this helps.
Cheers.
Depending on how you've linked it, there are two alternatives that are possibly simpler:
Use sprintf() to write your formatted text to a string, and then use your own putchar() or putstring() to send it to the desired USART.
If you're using the FILE struct to link your USARTs to the stdio functions (likely), you can use fprintf() to direct the results to a particular stream.