flakas

/* HC-SR04 Sensor
   https://www.dealextreme.com/p/hc-sr04-ultrasonic-sensor-distance-measuring-module-133696
  
   This sketch reads a HC-SR04 ultrasonic rangefinder and returns the
   distance to the closest object in range. To do this, it sends a pulse
   to the sensor to initiate a reading, then listens for a pulse 
   to return.  The length of the returning pulse is proportional to 
   the distance of the object from the sensor.
     
   The circuit:

dnomadb

import fiona
import click
from rasterio import features, Affine

def makeAffine(bounds, width):
    xD = bounds[2] - bounds[0]
    yD = bounds[3] - bounds[1]
    cS = xD / float(width - 2)

    height = int(yD / cS) + 1

darribas

ThomasG77

Run Jupyter notebook with PyQGIS

On Windows

Look at this existing tutorial https://lerryws.xyz/posts/PyQGIS-in-Jupyter-Notebook

On Ubuntu

Install

TG9541

Using a cheap video display as a Raspberry Pi monitor

Displays with 4.3" and 16:9 ratio like the one below are available from Chinese outlets for less than $10. Resolution is 480x272 but it's not clear if that's the raw resolution or actual RGB pixels. Power supply is 12-24V (actually 9-34V). Two video inputs are provided, one has priority. If used with a rear-view camera the lower-priority input can be used as a status display. If no video input is provided the display is in standby.

Using the Raspberry Pi TV monitor output

My monitor has a native resolution of 272 lines. I'm not sure to which TV standard that corresponds (maybe PAL?) but with the help of an SSH session the command tvservice -c "NTSC 4:3 P" results in a stable image. I'd like switch to TV-out mode; for this purpose the command shows the corresponing sdtv_mode value for /boot/config.txt. I had to adjust the overscan settings to use the full