Ian Turton ianturton

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

Run Jupyter notebook with PyQGIS

On Windows

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

	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

	/* 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:

Ian Turton ianturton

Using a cheap video display as a Raspberry Pi monitor

Using the Raspberry Pi TV monitor output

Run Jupyter notebook with PyQGIS

On Windows

On Ubuntu

Install