i receive this type of messages in my Raspberry Pi from Serial Port ( in this case usb1) , and i want to execute some instrutions in this case os.system(instrutions) when i receive some numeric values but from
some strings and not from other strings.
whe start with Light: ..... i want to receive value
example message receive in my serial interface:
"Light: 16 lx , quality: low" -> i just want number 16
http : 200 ok -> i don need this number 200
I have already one python cript in place but give error many times:
error messages
Light: 13 lx , quality: toolow
Traceback (most recent call last):
File "receive_serial_data_from_usb1.py", line 11, in
if number [0] > 400 :
IndexError: list index out of range
//python script:
#!/usr/bin/env python3
import serial
import os
ser = serial.Serial('/dev/ttyUSB1', 115200, timeout=1)
ser.flush()
while True:
if ser.in_waiting > 0:
line = ser.readline().decode('utf-8').rstrip()
number = [int (s) for s in line.split () if s.isdigit ()]
if number [0] > 400 :
print ('HIGH ATTENTION!!!')
os.system('sudo python control.py -t DA:74:56:99:71:DE -c move_down')
if number [0] < 10 :
print ('LOW ATTENTION!!!')
os.system('sudo python control.py -t DA:74:56:99:71:DE -c move_up')
else :
print(line)
Can you help me?
Related
For field, research where I want to study a plant-insect interaction, I am trying to set up a PICT (Plant Insect Interactions Camera Trap). There is a very detailed description available on https://zenodo.org/record/6301001, still I am stuck.
I can excess the camera through the browser but the script won’t start.
I am an absolute beginner and I have no idea what I am doing wrong. Can anybody help get this running?
This is the script from the paper which I saved as camera.py in home/pi:
import picamera
import socket
import uuid
from datetime import datetime as dt
qual=22 # level of image quality between 1 (highest quality, largest size) and 40 (lowest quality, smallest size), with typical values 20 to 25, default is 0.
video_duration = 3600 # video duration in seconds
video_number = 1000 # number of video sequences to shoot
UID = uuid.uuid4().hex[:4].upper()+'_'+dt.now().strftime('%Y-%m-%d_%H-%M') # generate random unique ID that will be used in video filename
HostName=socket.gethostname()
with picamera.PiCamera() as camera:
camera.resolution = (1296, 972) # max fps is 42 at 1296x972
camera.framerate = 15 # recomended are 12, 15, 24, 30
camera.annotate_frame_num = True
camera.annotate_text_size = int(round(camera.resolution[0]/64))
camera.annotate_background = picamera.Color('black') # text background colour
camera.annotate_foreground = picamera.Color('white') # text colour
for filename in camera.record_sequence([
'/home/pi/record/'+HostName+'_'+UID+'_%03d.h264' % (h + 1)
for h in range(video_number)
], quality=qual):
start = dt.now() # get the current date and time
while (dt.now() - start).seconds < video_duration: # run until video_duration is reached
camera.annotate_text = HostName+', '+str(camera.framerate)+' fps, Q='+str(qual)+', '+dt.now().strftime('%Y-%m-%d %H:%M:%S') # tag the video with a custom text
camera.wait_recording(0.2) # pause the script for a short interval to save power
I am gettin the following output:
~ $ python camera.py
Traceback (most recent call last):
File "camera.py", line 23, in <module>
], quality=qual):
File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 1270, in record_sequence
camera_port, output_port = self._get_ports(True, splitter_port)
File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 559, in _get_ports
self._check_camera_open()
File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 540, in _check_camera_open
raise PiCameraClosed("Camera is closed")
picamera.exc.PiCameraClosed: Camera is closed
I want to know the cause.
os : ubuntu 20.4
heu version : 4.10.0
livy version : 0.8.0
spark version : 3.3.0
hadoop version : 3.3.4
hive version : 3.1.3
After installing livy to use pyspark, I checked the operation of pyspark using curl.
And in apache hue -> pyspark, print(1+1) works fine.
However, the code below and all pyspark commands do not work
import random
NUM_SAMPLES = 100000
def sample§:
x, y = random.random(), random.random()
return 1 if xx + yy < 1 else 0
count = sc.parallelize(range(0, NUM_SAMPLES)).map(sample).reduce(lambda a, b: a + b)
print(count)
When the above sample program is executed, the following error message is displayed.
[07/Oct/2022 15:24:36 +0900] decorators ERROR Error running fetch_result_data
Traceback (most recent call last):
File “/home/hue/hue-4.10.0/desktop/libs/notebook/src/notebook/decorators.py”, line 119, in wrapper
return f(*args, **kwargs)
File “/home/hue/hue-4.10.0/desktop/libs/notebook/src/notebook/api.py”, line 329, in fetch_result_data
response = _fetch_result_data(request, notebook, snippet, operation_id, rows=rows, start_over=start_over)
File “/home/hue/hue-4.10.0/desktop/libs/notebook/src/notebook/api.py”, line 339, in _fetch_result_data
‘result’: get_api(request, snippet).fetch_result(notebook, snippet, rows, start_over)
File “/home/hue/hue-4.10.0/desktop/libs/notebook/src/notebook/connectors/spark_shell.py”, line 235, in fetch_result
raise QueryError(msg)
notebook.connectors.base.QueryError: Traceback (most recent call last):
File “/tmp/3309927620969108702”, line 223, in execute
code = compile(mod, ‘’, ‘exec’)
TypeError: required field “type_ignores” missing from Module
And when I do curl like below, I get the same error.
curl localhost:8998/sessions/11/statements -X POST -H 'Content-Type: application/json' -d '{"code":"import random\n\nNUM_SAMPLES = 100000\n\ndef sample(p):\n x, y = random.random(), random.random()\n return 1 if x*x + y*y < 1 else 0\n\ncount = sc.parallelize(range(0, NUM_SAMPLES)).map(sample).reduce(lambda a, b: a + b)\nprint(count)"}'
livy#bigdata:~$ curl localhost:8998/sessions/11/statements/1
{"id":1,"code":"import random\n\nNUM_SAMPLES = 100000\n\ndef sample(p):\n x, y = random.random(), random.random()\n return 1 if x*x + y*y < 1 else 0\n\ncount = sc.parallelize(range(0, NUM_SAMPLES)).map(sample).reduce(lambda a, b: a + b)\nprint(count)","state":"available","output":{"status":"error","execution_count":1,"ename":"TypeError","evalue":"required field \"type_ignores\" missing from Module","traceback":["Traceback (most recent call last):\n"," File \"/tmp/7630604275391098405\", line 223, in execute\n code = compile(mod, '<stdin>', 'exec')\n","TypeError: required field \"type_ignores\" missing from Module\n"]},"progress":1.0,"started":1665132825039,"completed":1665132825041}
I currently have a python program that (very slowly) recieves data from a Red Pitaya board by recursively calling:
redpitaya_scpi.scpi(192.169.1.100).rx_txt()
I would like to use rp_remote_acquire to achieve a higher throughput with a ring buffer.
I am able to execute ./rp_remote_acquire on both the Red Pitaya (server) and a linux machine (client) thanks to stackoverflow.
I get some unique content in /tmp/out every time I execute the following commands on the Red Pitaya (which suggests that the program on the server has access to the data from its hardware).
rm /tmp/out
./rp_remote_acquire -m 3
cat /tmp/out
In order to transfer data from the Red Pitaya (client) to the linux machine (server), I launch ./rp_remote_acquire with the following parameters:
Server (192.169.1.100):
./rp_remote_acquire -m 2 -a 192.169.1.102 -p 14000
Client (192.169.1.102):
./rp_remote_acquire -m 1 -a 192.169.1.100 -p 14000
Where:
-m --mode <(1|client)|(2|server)|(3|file)>
operating mode (default client)
-a --address <ip_address>
target address in client mode (default empty)
-p --port <port_num>
port number in client and server mode (default 14000)
Both machines are able ping eachother and the machines are able to establish a connection (ie. int connection_start(option_fields_t *options, struct handles *handles) at transfer.c:251 returns zero).
The client ends up executing the following code snippet from transfer.c
533 while (!size || transferred < size) {
(gdb) n
534 if (pos == buf_size)
(gdb) n
539 if (pos + CHUNK <= curr) {
(gdb) n
552 memcpy(buf, mapped_base + pos, len);
(gdb) n
554 if (handles->sock >= 0) {
(gdb) n
552 memcpy(buf, mapped_base + pos, len);
(gdb) n
554 if (handles->sock >= 0) {
(gdb) n
555 if (send_buffer(handles->sock, options, buf, len) < 0) {
(gdb) n
569 pos += len;
(gdb) n
533 while (!size || transferred < size) {
It seems like the client is effectively just doing the following (note size = 0 by default):
533 while (!size || transferred < size) {
552 memcpy(buf, mapped_base + pos, len);
552 memcpy(buf, mapped_base + pos, len);
569 pos += len;
}
This behaviour seems to be the intention of the programmer because the client stops as soon as the server is halted:
554 if (handles->sock >= 0) {
(gdb)
556 if (!interrupted)
the program doesn't get stuck in this loop when I change size such that it is not equal to zero (=> smaller packets?).
I would like to be able to access the data that is (hopefully) being sent from the Red Pitaya (server) to the linux machine (client) and somehow make this data available to a python program on the client machine.
My question(s):
What is going on here and how can I access the data?
Do I need to synchronously run a second program on the client that somehow reads the data that rp_remote_acquire is copying into the clients memory?
The solution is surprisingly simple.
When it is running properly in server mode, rp_remote_acquire writes the data to a socket:
/*
* transfers samples to socket via read() call on rpad_scope
*/
static u_int64_t transfer_readwrite(struct scope_parameter *param,
option_fields_t *options, struct handles *handles)
In client mode it reads the data from the socket and does something with it.
Since we are working with sockets here, we don't need to care what rp_remote_acquire does in client mode. We can simply create our own socket with a python script and recieve the data in the script (which is where I want to have the data).
This is an example from #otobrzo:
import socket
import numpy as np
import matplotlib.pyplot as plt
client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
ip=socket.gethostbyname("XX.XX.XX.XX") # IP of redpitaya in server mode:
# run cat ddrdump.bit > /dev/xdevcfg
#compiled and run on redpitay ./rp_remote_acquire -m 2 -k 0 -c 0 -d 0
port=14000 # default port for TCP
address=(ip,port)
client.connect(address)
Nl = 10000
#while True:
for x in range(0, Nl):
# print("test1")
bytes_data = client.recv(1024) # set the amount data transferred
if x == 0:
data = np.frombuffer(bytes_data, dtype=np.int16) # from 16bit data to int16
data = np.array(data, dtype=float)
data_all = data
else:
data = np.frombuffer(bytes_data, dtype=np.int16) # from 16bit data to int16
data = np.array(data, dtype=float)
data_all= np.hstack((data_all,data))
#%%
FPS = 125e6
time = np.arange(0,np.size(data_all))/FPS
plt.plot(time,data_all)
I am trying to send video from raspberry pi to my laptop via laptop
and save them as pictures so i found the below code online
but I get the following errors when I run them
so i run this client code on the pi using Thonny ide that comes preloaded
, I apologize for the way code is formatted below and would be very grateful if anybody can help me sort this out
Server on the laptop is run using python 3.6 idle
import sys
import numpy as np
import cv2
import socket
class VideoStreamingTest(object):
def __init__(self):
self.server_socket = socket.socket()
self.server_socket.bind(('0.0.0.0', 9006))
self.server_socket.listen(0)
self.connection, self.client_address = self.server_socket.accept()
self.connection = self.connection.makefile('rb')
self.streaming()
def streaming(self):
try:
print("Connection from: ", self.client_address)
print("Streaming...")
print("Press 'q' to exit")
stream_bytes = ' '
while True:
stream_bytes += self.connection.read(1024)
first = stream_bytes.find('\xff\xd8')
last = stream_bytes.find('\xff\xd9')
if first != -1 and last != -1:
jpg = stream_bytes[first:last + 2]
stream_bytes = stream_bytes[last + 2:]
#image = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8), cv2.CV_LOAD_IMAGE_GRAYSCALE)
image = cv2.imdecode(np.fromstring(jpg, dtype=np.uint8), cv2.CV_LOAD_IMAGE_UNCHANGED)
cv2.imshow('image', image)
if cv2.waitKey(1) & 0xFF == ord('q'):
break
finally:
self.connection.close()
self.server_socket.close()
if __name__ == '__main__':
VideoStreamingTest()
I get the following error
Connection from: ('192.168.43.3', 47518)
Streaming...
Press 'q' to exit
Traceback (most recent call last):
File "C:\Users\John Doe\d-ff\Desktop\AutoRCCar-master
3\test\stream_server_test.py", line 46, in <module>
VideoStreamingTest()
File "C:\Users\John Doe\d-ff\Desktop\AutoRCCar-master
3\test\stream_server_test.py", line 16, in __init__
self.streaming()
File "C:\Users\John Doe\d-ff\Desktop\AutoRCCar-master
3\test\stream_server_test.py", line 28, in streaming
stream_bytes += self.connection.read(1024)
TypeError: must be str, not bytes
Client side on the pi
import io
import socket
import struct
import time
import picamera
# create socket and bind host
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('ToM', 9006))
connection = client_socket.makefile('wb')
try:
with picamera.PiCamera() as camera:
camera.resolution = (320, 240) # pi camera resolution
camera.framerate = 5 # 10 frames/sec
time.sleep(2) # give 2 secs for camera to initilize
start = time.time()
stream = io.BytesIO()
# send jpeg format video stream
for foo in camera.capture_continuous(stream, 'jpeg', use_video_port = True):
connection.write(struct.pack('<L', stream.tell()))
connection.flush()
stream.seek(0)
connection.write(stream.read())
if time.time() - start > 600:
break
stream.seek(0)
stream.truncate()
connection.write(struct.pack('<L', 0))
finally:
connection.close()
client_socket.close()
I get the following error
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/pi/Desktop/stream_client.py", line 40, in <module>
connection.close()
File "/usr/lib/python3.5/socket.py", line 594, in write
return self._sock.send(b)
BrokenPipeError: [Errno 32] Broken pipe
I first thought it might be because of the limited bandwidth since i was running vnc viewer (remote desktop) via wifi on the pi but I don't think it is
I also had same problem. After some searching I found solution.
In python 3 we have to specify whether string is regular string or binary.Thats why we use b'string' instead of just 'string'
Change
stream_bytes = ' '
to
stream_bytes = b' '
Also change
first = stream_bytes.find('\xff\xd8')
last = stream_bytes.find('\xff\xd9')
to
first = stream_bytes.find(b'\xff\xd8')
last = stream_bytes.find(b'\xff\xd9')
Note that you are using cv2.CV_LOAD_IMAGE_UNCHANGED which is not available in opencv3.0
Use cv2.IMREAD_COLOR to show image in color.
Edit these changes and your stream should run smoothly.
connection.write(struct.pack('<L', 0))
Check out by inserting the above within try
I have the below code that i am trying the run using python3.2 interpreter.
import socket #for sockets
import sys #for exit
#from UserString import MutableString
#create an INET, STREAMing socket
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
except socket.error:
print ('Failed to create socket')
sys.exit()
print ('Socket Created')
host = 'www.google.com';
port = 80;
try:
remote_ip = socket.gethostbyname( host )
except socket.gaierror:
#could not resolve
print ('Hostname could not be resolved. Exiting')
sys.exit()
#Connect to remote server
s.connect((remote_ip , port))
print ('Socket Connected to ' + host + ' on ip ' + remote_ip)
#Send some data to remote server
message = "GET / HTTP/1.0\r\n\r\n"
try :
#Set the whole string
s.sendall(message.encode())
except socket.error:
#Send failed
print ('Send failed')
sys.exit()
print ('Message send successfully')
#Now receive data
messageParts = []
remaining = 4096
chunk = s.recv(remaining)
messageParts.append(chunk)
while (len(chunk) > 0):
chunk = s.recv(remaining)
messageParts.append(chunk.decode())
finalMessage = b"".join(messageParts)
print('Printing the html contents ...')
print(finalMessage)
Upon running the above code, with python version 3.2, i get the below error:
Socket Created
Socket Connected to www.google.com on ip 74.125.201.147
Message send successfully
Traceback (most recent call last):
File "TestMainServerV2.py", line 73, in <module>
finalMessage = b"".join(messageParts)
TypeError: sequence item 1: expected bytes, str found
Could anybody let me know what is the issue?
Thanks!
messageParts.append(chunk.decode())
is appending strs to messageParts.
chunk = s.recv(remaining)
messageParts.append(chunk)
is appending bytes to messageParts. (Everything that comes through a socket is bytes so chunk is a bytes object.)
Especially in Python3, one should never mix strs and bytes.
b"".join(messageParts)
raises a TypeError since b"".join expects only bytes.
You can avoid the problem by not decoding chunk. Use
messageParts.append(chunk)
instead of
messageParts.append(chunk.decode())