Hi all...
(Apologies for any typos at all.)
This is a step by step _script_ to check if your Arduino is talking to your Linux or Macbook Pro computer using the Terminal...
It works on at least 3 Linux flavours and now the Macbook Pro...
I hope you find it useful as a simple check for... (0 Replies)
This is a very simple starter DEMO to access Arduino Diecimila Board for the
Macbook Pro 13" OSX 10.7.5...
A potentiometer is connected between 5V and Gnd with the wiper connected to
ANALOG IN 0 on the Arduino. This was adjusted to give the Ms and Ls as seen...
I now have DC in for this... (0 Replies)
I am working on a semi-auto detection idea for Arduino for the Scope project.
It does require a little user intervention but minimal.
It works by just responding to two on screen prompts to unplug and plug Arduino
into a USB port.
There are two versions and both work perfectly well and give... (3 Replies)
In my further exploration of Arduino, today I decided to install the arduino-cli on my mac today.
https://github.com/arduino/arduino-cli
I followed the instructions for macOS but when I got to this part:
arduino-cli board list
I got the dreaded "Unknown" Fully Qualified Board Name... (1 Reply)
HI all...
(Apologies for any typos.)
To add to Neo's Arduino subject matter I have decided to upload this in ".zip" format.
Ignore "*.info" files these are AMIGA icons only and also the "HAM" drawer as these are photos in ancient AMIGA HAM modes.
I have noticed that there are current... (6 Replies)
Waiting for more fun Ardunio parts from AliExpress, I decided to test two cheap Chinese Arduino UNO clones.
The Arduino UNO R3 (CH340G) MEGA328P
The Wavgat UNO R3 (CH340G) MEGA328P
Both of these Chinese Ardunio clones sell for about $3 USD, delivered to your door.
The bottom line is... (0 Replies)
Just finished a quick Python script to send the current unix time over to the Arduino from macOS, so in the absence of GPS or some other way to get the unix timestamp (epoch time) to the Arduino, I can get my macOS and Arduino UNO synced to within a second.
Normally, when the Arduino starts... (9 Replies)
Here is a sketch to do basic testing for the Arduino UNO and the MLT-BT04.
This BLE module works with IOS (iPhone) and I'll add some details on my IOS testing with an iPhone in a follow-up post.
For now, here is the basic BLE (HM-10) sketch for the Arduino UNO:
/*
Arduino test-code... (7 Replies)
Discussion started by: Neo
7 Replies
LEARN ABOUT DEBIAN
pfsdisplayfunction
pfsdisplayfunction(1) General Commands Manual pfsdisplayfunction(1)NAME
pfsdisplayfunction - Apply display function to color or gray-scale images
SYNOPSIS
pfsdisplayfunction [--display-function <df-spec>] [--to-pixels | --to-luminance] [--help] [--verbose]
DESCRIPTION
Use this command to convert pixel values to luminance / radiance units displayed on a monitor or to perform inverse conversion. This com-
mand is useful in combination with the HDR-VDP to convert LDR images to luminance maps representing images shown on a particular display.
The display function specification is identical to the specification used in the pfstmo_mantiuk08 tone mapping operator (from the pfstmo
package).
If neither --to-luminance nor --to-pixels option is specified, the appropriate conversion direction will be deducted from the LUMINANCE tag
in the pfs stream.
OPTIONS --to-luminance, -l
Convert pixel values to absolute luminance / radiance units. For RGB images the same display function is applied in each color chan-
nel.
--to-pixels, -p
Convert absolute luminance / radiance units to pixel values. For RGB images the same display function is applied in each color chan-
nel.
--display-function <df-spec>, -d <df-spec>
The display function describes how output luminance of a display changes with pixel values. If no parameter is given, the command
assumes -df pd=lcd (see Pre-defined display below). There are several ways to specify the display function:
Gamma-gain-black-ambient display model
g=<float>:l=<float>:b=<float>:k=<float>:a=<float>[:n=<float>]
Gamma-gain-black-ambient model can approximate a range of displays and is a compact way to specify a display function. It assumes
that a display function has the following form:
L_d(I) = (l-b)*I^gamma + b + k/pi*a
The parameters are as follows:
g - gamma or exponent of a display function (default 2.2, usually from 1.8 to 2.8)
l - peak luminance of a display in cd/m^2 (default 100, from 80 for CRTs to 500 or more for newer displays)
b - black level, which is luminance of a black pixel when the display is on (default 1, usually from 0.3 to 1 cd/m^2)
k - reflectivity of a screen (assuming that it is diffuse) (default 0.01, usually about 0.01 (1%) for LCD displays, more for CRTs)
a - ambient illumination in lux. Typical values are:
50 lux Family living room (dim, default)
400 lux
A brightly lit office
32000 lux
Sunlight on an average day (min.)
100000 lux
Sunlight on an average day (max.)
Pre-defined display
pd=<display_type>
Use pre-defined display type. This options are for convenience only and they do not mean to accurately model the response of a par-
ticular display. The following display types are recognized:
lcd_office (g=2.2, l=100, b=0.8, k=0.01, a=400 )
lcd set to "office" mode seen in bright environment
lcd (g=2.2, l=200, b=0.8, k=0.01, a=60 )
typical lcd seen in dim environment (default)
lcd_bright (g=2.6, l=500, b=0.5, k=0.01, a=10 )
newer LCD TV seen in dark environment
crt (g=2.2, l=80, b=1, k=0.02, a=60 )
CRT monitor seen in dim environment
The parameters in the parenthesis are the same as for the gamma-gain-black-ambient model explained above.
Lookup-table
lut=<file>
This is the most accurate specification of the display response function, but requires measuring it with a luminance meter. The
lookup table should account also for ambient light, so that it is recommended to use the luminance meter that can measure screen
luminance from a distance, such as Minolta LS-100 (as opposed to those that use rubber tube touching a display that eliminates the
influence of ambient light). The <file> must be a comma-separated text file in a format (CSV) with two columns: first column repre-
sents pixel values (from 0.0 to 1.0) and the second physical luminance in cd/m^2. Both the pixel value and the luminance should
increase in each raw.
EXAMPLES
pfsin barbara.jpg | pfsdisplayfunction -l -d pd:crt -v | pfsout barbara_crt.hdr
Convert barbara.jpg image from pixel values to a luminance map of the image shown on a CRT monitor and store the map as an HDR
image.
SEE ALSO pfsgamma(1)pfstmo_mantiuk08(1)BUGS
Please report bugs and comments to the pfstools discussion group (http://groups.google.com/group/pfstools).
pfsdisplayfunction(1)