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Python 3.5 bytes to float conversion help

Discussion in 'Miscellaneous' started by Pedro Pablo, Oct 20, 2016.

  1. Pedro Pablo

    Pedro Pablo Active Member

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    Hi

    Some time ago i've made a program in Python to read memory and output to an arduino to get a speedometer. Now in the meantime of drumming, coding, keep trying to get the values from Initial D Special Stage and missing my ex-girlfriend, I want to do the same but with another game and using other methods.

    The game that i'm working is Race Driver GRID. I've made a simple UDP listener in Python, but I never worked with bytes (the memory reading module was a pain for me), so IDK what I have to do with this telemetry send by the game:

    b'6t}@q\x1f\x19>\xe4\x08\xc5E\x00\x08%\xbb\xc5\xaa\x84C&\xfe\x05A\xb3\x14\x89\xc4@\x88\xa4;^\xc2\x9b\xb9\x95;\xa4\xbb\x9f\xe5u\xb8t#H>\x823\xee\xb8\x15\x10{\xbf\x00\x9bz\xbf\xed\x05w=\xf3\xc7G\xbe\xe9<\x85\xc0\x1b\xda\x82\xc0 \x9d\x81\xc0\x9e\x9f~\xc0\xc2\xbc\xf8>\x8c\x9dU\xbf\x9d\xc6\xe6?\xe6/P?\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80?\x00\x00\x80?`\x9380\xc0\\\xe4/\x00\x00\x00\x00'

    I know that it's a byte object, so i've started researching from there, but without results. Reading in a post from the arduino forums, combining the 28, 29, 30 and 31 byte i'll get the speed, but my problem is how to do that. I want to know how to get those bytes and combining them. With that not only I can measure the speed, also i can get other kind of data (gear, rpm, etc....) and send it to an arduino (i donde it before)
  2. vthinsel

    vthinsel Well-Known Member

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    My Motion Simulator:
    Arduino, 4DOF
    something like

    import socket

    UDP_IP ="0.0.0.0"
    UDP_PORT =20777

    sock = socket.socket(socket.AF_INET,# Internet
    socket.SOCK_DGRAM)# UDP
    sock.bind((UDP_IP, UDP_PORT))
    import struct
    x =0
    y =4
    data, addr = sock.recvfrom(1024)
    output =struct.unpack('f', data[x:y])# 4 bytes at a time
    • Like Like x 1
  3. Pedro Pablo

    Pedro Pablo Active Member

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    Well, yesterday (THE IRONY!) i've figured out hot to get the data

    while True:
    data, addr = sock.recvfrom(1024) # Buffer Size
    speed = struct.unpack("27xf116x", data)
    gear = struct.unpack("131xf12x", data)
    print([int(speed[0]*3.6), int(gear[0])])

    The sad part is couldn't get the RPM. IDK if this the right way to get the data but at least it worked
  4. Pedro Pablo

    Pedro Pablo Active Member

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    Well, i've tested your example and it worked too. So, IDK what choose :sos