First Framebuffer to HDMI screen on PYNQ-Z1 Fpga board

 First framebuffer to HDMI on pynq-z1 board. 

Chaotic fractals of mandelbrot

f(z) = z^2 + C

where z is a complex number (vector)

and C is a complex constant (vector of a constant norm)

output from my Xcode project:

for(i=0; i <iter;i++){

        float x = (z.x * z.x - z.y * z.y) + c.x;

        float y = 2.0 * (z.x * z.y) + c.y;

if((x * x + y * y) > 40.0) break; //distance from the origin>2 ==> done!!

        z.x = x;

        z.y = y;

}

After 355 iterations:

PCB Inspector with pytrack

One of my friends gently asked me to help them on automatic inspection of PCBs (xray).

I used pytrack to investigate and report soldering failures (bad bubbles). 

# -*- coding: utf-8 -*-

# 07.05.2017

# porsuk

from __future__ import division, unicode_literals, print_function  # for compatibility with Python 2 and 3

import matplotlib as mpl

import matplotlib.pyplot as plt

import numpy as np

import pandas as pd

from pandas import DataFrame, Series  # for convenience

from scipy import ndimage

from skimage import morphology, util, filters

import pims

import trackpy as tp

def crop(img):

    """

    Crop the image to select the region of interest

    """

    x_min = 20#745

    x_max = -25#850

    y_min = 50#225

    y_max = -250#300

    

    return img[y_min:y_max,x_min:x_max]

def rgb2gray(rgb):

    r, g, b = rgb[:,:,0], rgb[:,:,1], rgb[:,:,2]

    gray = 0.2989 * r + 0.5870 * g + 0.1140 * b

    return gray

def preprocess_pcb(img):

    img=rgb2gray(img)

    """

    Apply image processing functions to return a binary image

    """

    # Crop the pictures as for raw images.

    img = crop(img)

    print(img)

    # Apply thresholds

    img = filters.threshold_adaptive(img, 57)

    threshold = 0.9

    idx = img > img.max() * threshold

    idx2 = img < img.max() * threshold

    img[idx] = 0

    img[idx2] = 3

    img = ndimage.binary_dilation(img)

    img = ndimage.binary_dilation(img)

    return util.img_as_int(img)

frames = pims.ImageSequence('*.jpg',process_func=preprocess_pcb)

for frame in frames:

     f = tp.locate(frame, percentile=10,diameter=77, minmass= 3.0e+07,separation=80,threshold=1/30)

     print('frame = ',f['frame'][0] )

     print(f)

     print('max bubble percentage: ', 20 * max(f['size']) / 250 )

     plt.figure(f['frame'][0])  # make a new figure

     tp.annotate(f,frame,plot_style={'markersize':35});

DIY 4-way vacuum valve to engage 4wd(subaru justy oem 4wd valve failure)

 Broken oem 4-way valve: Tried epoxy but did not fixed it. Actually epoxy sealed the vacuum leak but most probably solenoid was gone.

DIY forester rear wheel bearing replacement

was very ezy and straight forward except breaking the brake line (obtain propper wrench to loose yours). Bleeding alone may be another challenge but i used pipe and bottle method w/o any problem.

 final and true drum brake instrument re-installation (above pics was taken during unsuccessful attempts):

 Thanx to helpful machinist for installing new bearing in press. (so DIY except pressing)

 ready to install:

91 MY LN130 Hilux Surf A/C Condenser Relocation

Relocation of the underslung a/c condenser of hilux surf to in front of the radiator. 

Tested against highway and city speeds w/o any increase in coolant temp. btw oem rad. fan re-wired in-order to start manually. and always kicked on city speeds. But not sure if needed to start or not since i did not installed digi temp gauge so i was  monitoring just analog oem one. At the end, it was a successful project. Could be better if i had alu welder.

But for those thinking about carrying the a/c condenser to behind of the grill, i can exactly say that suspicious ln130 radiator was not blocked (to overheat) by the a/c condenser.

DIY 2nd Gen 4runner (Hilux Surf) grab handle installation

91 MY 2nd gen 4runner (ln130 hilux surf actually) front driver and passenger side vertical grab handle installation:
1 - nice front prado grab handles from wrecker.
2 - back grab handles from 98MY vx80.
3 - M6 15mm alu rivet nuts. The only option was novus from bauhaus.
4 - 9mm drill bit.
5 - pictures tell the remaining. (btw my homemade rivet nut installation tool worked great for me)

was great fun...

ParticleSLAM Differential Jacobian Method

Bitti

Fatih's weblog hayatına son vermiştir.

Sis

ImageMagick montage (creating picture collages)

Using Gimp  takes much time unless you are familiar with layers etc. Picasa 2 in ubuntu 9.04 does not give permission to customize the collage maker's options (like background color, positioning, gap etc.). So ImageMagick is a good choice to create collages.

An easy way of creating collages with ImageMagick:

montage *.jpg collage.jpg

or consider there are plenty of files in a directory named such as xy.jpg, xy1.jpg, xy2.jpg, xy3.jpg, ..., you can specify the filenames to be montaged (also border type and color, etc.) as:

# montage filesToBeMontaged -theBorderType # -theBorderColor # -theGapBetweenPictures +#+# resultantCollage
montage x{y,y1,y2,y3}.jpg -border 5 -bordercolor darkyellow -geometry +2+2 collage.jpg

Here are the other very useful examples.