dht | Arduino-library for DHT11/DHT22 sensors

I have a PowerShell script that I have developed and tested in Visual Studio Code that runs without error. However, when I attempt to run the same script from a PowerShell command line, it fails with several errors, the first one being a complaint about the use of Param on the first line of the script. I have PS 5.1 installed on my machine.

When launched from the command line, here is what I execute:

powershell -ExecutionPolicy Bypass -File Export_PI.ps1 -Project Catalyst-DHT

When I run this script from Visual Studio Code, I substitute a hard-coded value in lieu of the parameter -Project for testing purposes. When I run it from the PS command line, this is the first error I get:

Param : The term 'Param' is not recognized as the name of a cmdlet, function, script file, or operable program.

I have read elsewhere that this typically occurs when Param() is not the first non-commented line in the script. In my script, it is the first non-commented line:

$ProjectName = Param([String]$Project)

I'm not a PowerShell guru, so this could well be a newbie mistake. I'm hoping someone can help me figure it out. Thanks.

I'm having hard time setting up 2 node Cassandra cluster on Ec2 instances. This is 2.2.19 version. I cannot upgrade due to some other dependencies involved.

The Ec2 instances are in private subnet. Assigned static private ips

Here is my cassandra.yaml

im starting with django and iot and i've decided to start (for learning purposes) an app that connects to my sensors attached to my raspberry pi.

The thing that im struggling is the next one:

I've done a class for my DHT11 sensor (temperature and humidity), and i've declared all values and wrote a method, which gets and prints the values of the sensor, and made a page where i show all the properties of the object, like "asigned pin" or the "name" of it; all fine until here. this is the class:

I've got a problem with a current project that aims to transmit data from a sensor to a platform in real time. It is a DHT22 sensor which is able to measure temperature and humidity. The idea was to save the data in a csv file and then send it to the platform using another script (sending the data from the csv file to the platform has always worked). The problem is that the data is stored in the csv file, but only in intervals of about 15 minutes and always in blocks of 800. The real-time aspect therefore does not come into play.

I used the following script to save the data as a csv file:

Since collisions found in SHA-1, BitTorrent moved to more secure hash function SHA-2, but why not to create hash format representation like magnet:?xt=urn:bt_[hash_function_name]:info_hash ?

Example: magnet:?xt=urn:bt_sha3:123456789101112131415

It's like 2+2 that people will continue building up more advanced computers. And collisions can be made in near future, and looking into new protocol, we can already see that its adoption is happening very slowly, it wouldn't be nicest thing if say in 2030 new collision occured, then developers will have to change this protocol again?

V1 DHT is not compatible with V2 anyway.

So my noob question goes to @the8472

Pictures of the wiring of the DHT11 to the ESP

When I try to read temperatures in Fahrenheit, Celsius and to get the Humidity, it always says 'nan' on the serial monitor. I'm working the Arduino IDE with the Generic ESP8266 Module and I got the libraries "DHT-Sensor-Library" and the "Adafruit-Unified-Sensor"-Library installed.

I know it stands for "Not a number", but why? I looked on here before and tried using (isnan) and store it in a backup-variable, but that didn't work either.

I am using Cassandra v3.9. I updated the config files as shown below but 25.80.44.50 won't join the cluster (it was formally part of the 2-node clusrter along with 25.80.44.51).

When I reverted back to a 2 node cluster, the database was corrupted and I had to restore from a backup.

i am trying to get my raspberry pi to print data from external sensors to a display and save it to a .txt at the same time.

What i did works fine when launching the script in a shell via ssh. But that stops the script after closing the shell.

So i tried to put it in the rc.local file to launch it while booting. But that works only half way, as it shows the data on the display but it doesn't save it to a file.

I have a time-series, which essentially amounts to some instrument recording the current time whenever it makes a "detection". The sampling rate is therefore not in constant time, however we can treat it as such by "re-sampling", relying on the fact that the detections are made reliably and we can simply insert 0's to "fill in" the gaps. This will be important later...

The instrument should detect the "signals" sent by another, nearby instrument. This second instrument emits a signal at some unknown period, T (e.g. 1 signal per second), with a "jitter" likely on the order of a few tenths of a percent of the period.

My goal is to determine this period (or frequency, if you like) using only the timestamps recorded by the "detecting" instrument. Unfortunately, however, the detector is flooded with noise, and a significant amount (I estimate 97-98%) of "detections" (and therefore "points" in the time-series) are due to noise. Therefore, extracting the period will require more careful analysis.

My first thought was to simply feed the time series into an FFT algorithm (I'm using FFTW/DHT), however this wasn't particularly enlightening. I've also tried my own (admittedly rather crude) algorithm, which simply computed a cross-correlation of the series with "clean" series of increasing period. I didn't get very far with this, either, and there are quite a handful of details to consider (phase, etc).

It occurs to me that something like this must've been done before, and surely there's a "nice" way to accomplish it.