Raspberry Pi Forums

ankith26

Here is some sample code i had used in a project few months ago This helped me acheive 2 directional messaging. Arduino side:- void setup() { Serial.begin(9600); // begin transmission } void loop() { String val; while (Serial.available() > 0) { val = val + (char)Serial.read(); // read data byte by b...

ankith26

I know i am replying a bit late but i shall try to solve the problem. try s.encode('ascii') You have to tell python to encode data in ascii cos it does it in utf8 by default. And arduino uses ascii BTW, I noticed you are using port /dev/ttyUSB0.. Check whether arduino is on same port. Cos in my case...

ankith26

Yup.. Through sockets that is...
I found this youtube video that shall suite your purpose
https://www.youtube.com/watch?v=l0p-NvmoeUA

ankith26

A Pi to Pi connection would be easier according to me..
On arduino-raspi connection through lan, idk much

ankith26

If you plan to interface arduino and raspi, use serial protocol with usb cable connecting them... This is the easiest way to have any sort of chat or communication
I had many troubles using esp8266 module(I fried 3 modules as i did not know how to handle the thing)

ankith26

Answer is yes, but do not take my word for it... AFAIK, while the hardware of raspi4 is good, there is some slowness caused by the latest version(buster) of Raspbian... As you may be knowing, its not been so long since raspi4 is released and the OS will take time to get the most out of the available...

ankith26

Many use the Raspbian OS , but you have ton of other options for OS. With raspbian, you get a browser called chromium which is good as chrome. BTW, most raspberry os are based on linux , which means it is free..

ankith26

Well, Thats a good question. A raspberry pi 4 is *almost* like a pc ,except that the processor is a bit slower being clocked at 1.5 ghz....I would say you can manage with a 2gb ram or 4gb ram(recommended for streaming) version of pi 4

ankith26

I am pretty sure they would not add an extra power pair of pin even for RPi3.. Mainly because it is quite pointless, you could connect the fan to the existing gpio by other methods like hacking the cable a little

ankith26

Now, this post will cover some math along with python so bear with me. I am using permutations from itertools module in python.. What this basically does is gives all possible ways of arranging n amount of objects in r slots. if i were to enter 123, my output would be 123 132 213 231 312 321 This wa...

ankith26

I am not getting your question... Could you be more precise

ankith26

An interesting observation, I just used pip install and got this interesting warning
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.

ankith26

hippy, I used your frange code like this in python 3 def frange(fromVal, toVal, stepVal=1.0): while fromVal < toVal: yield fromVal fromVal = fromVal + stepVal for f in frange(0.0, 20.0, 0.1): print(f) It gave me this result 0.0 0.1 0.2 0.30000000000000004 0.4 0.5 0.6 0.7 0.7999999999999999 0.8999999...

ankith26

but the bigger question is, who uses python2 nowadays.... I am sure that python2 will become a forgotten memory within 5 years I myself was confused for a while when i ran python and noticed my python3 code did not work on terminal when it worked on idle Best solution(for now) would be call python a...

ankith26

hippy wrote: ↑
Sat Jun 01, 2019 7:28 pm
If not going for what I consider my more elegant 'frange()' solution above, I would recommend -
Code: Select all
print("start")
t = 0.0
while t <= 1000.0:
    # some other stuff here
    t += 0.001
print ("complete")

That is a good solution i agree

ankith26

You could go for a 3.3v to 5V bi directional level shifter .. these things are available online at low cost and will work

ankith26

from serial import Serial from os import system # lets import only what we want data = "" #initialisation(only for first loop) while True: prevdata = data # lets put the data of prev loop in a new variable arduino = Serial('/dev/ttyACM0', 115200) # #this block gets data from arduino and waits for i...

ankith26

Python on raspberry pi is never precise to do perfectly timed stuff in any manner, For that use any microcontroller like arduino
if you have high level stuff, do it on raspberry pi

ankith26

os.system(....) usually works for me.
although I heard its not recommended and am not so sure

ankith26

ghp wrote: ↑

Tue May 28, 2019 7:04 pm

Code: Select all

print("start")
t = 0.0
while True:
    t += 0.001
    if t > 1000:
        break
    # some other stuff here
print ("complete")

This is simple and sufficient for your requirement in python

ankith26

I have a method to to this, but it will not involve integrating apache and python.Standard Apache with php will do.
note:- this is not the most efficient method, but will work
viewtopic.php?f=36&t=239587
Modify it to suit your needs. If help is required, post here

ankith26

thanks for link

ankith26

Hello all;
My goal is to livestream the video from piCam to my apache server and save it to a mpg file at the same time.... How will i do this

ankith26

I would want to know if such a thing happened to me..From where will we get these tiny capacitors. Does the RPF issue spare parts or something

ankith26

From your photo you gave,I can take it as a C58 , but from a raspberry pi 3b.
Saw the schematics of the 3b and it is there. looks like a vital capacitor for the audio jack

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