The open function opens a file. When you use the open function, it returns something called a file object.
I found the DS to be a bit of a special snowflake to set up, and the process was getting a little too maddening, so I moved on and tried a few other sensors including a K-type Thermocouple and also a Thermistor which eventually lead me to the DHT11, and subsequently the DHT22 higher range.
Humidity Doing this from first principles is difficult. A lot of my early experiments were born out of experimenting with Dew Points. My original plan was to have a first surface mirror thermally bonded to a Peltier module, then shine a laser at the mirror and detect it with a photodiode.
In practice, it was such a bugger to get working as it required a whole bunch of temperature sensors - one on the cold side, one on the hot side, and an ambient temperature. The driving Arduino would measure the ambient temperature, then ramp up the current through the Peltier via PWM switching with a beefy MOSFET to chill the mirror, and stop every degree or so, take a laser measurement and then ramp the temperature down again.
On the other hand, after I discovered the DHT11 and subsequently, the DHT22 sensors, I could get accurate temperature and humidity measurements thrown in for influxdb python write a file, in an inexpensive Arduino-friendly breakout board format for a nice low price.
Wind Speed Simple theory- make an anemometer and figure out some way to measure every time it goes round once, then figure out the circumference and figure out the wind speed from that. What has good bearings? I made this unholy contraption out of some little aluminum pots for cooking souffles in, and some bits of old aluminum window frame, and an old Maxtor hard disk.
The biggest problem with this idea is that the voltages involved are so teeny as to be almost unmeasurable, so I built an amplifier with a seriously high gain AD Instrumentation Amplifier, which ended up giving me a PWM signal with TTL voltages that at least the Arduino could read Then found a frequency counter library.
Until it got wet, then it stopped working until it dried out.
A little online digging shows someone else doing effectively the same thing as me, and all you have to do is count the clicks and multiply by 1. Wind Direction This was fun. Another application for low-friction bearings, so I had another go with another buggered hard drive.
This time, I took the platters off and marked one of them up with a Gray Code pattern. I made a cutaway in the base of the hard drive body, and mounted a circuit board with 4 reflective photodetector sensors, giving a 4-bit gray code output.
In practice, it was a bugger to get working.
So I ditched this idea and bought a second hand Absolute rotary position encoder off eBay. Wind direction remains a work in progress. Rainfall I bought another off-the-shelf rainfall sensor and modified it to make it more Arduino Friendly. The one I bought was actually part of a Wireless rain gauge, simple tipping bucket that triggered a reed switch.
I hooked it up to its wireless receiver and tipped the bucket. The metered rainfall showed 0. The next thing I did was to take the sender unit apart, remove the battery compartment and circuit board, and replace it with a little bit of Veroboard with a pull-up resistor and a unipolar Hall Effect switch.
I upgraded the magnet from the teeny block of ferrite to a little Neodymium magnet, and tested it a few times both by running water through it, and manually flicking it over by hand, and was getting a nice, reproducible TTL-like falling edge whenever the bucket flipped. Solar Intensity I had a play with a raw Light Dependent Resistor LDR but was having calibration issues between trying to figure out how much light corresponded with which resistance.
That said, my go-to favorite for light-weight processing is always the Arduino. I tend to buy Arduino Nanos in bulk on eBay, ordering 10 or 20 at a time and then treating them effectively like disposable devices and soldering them directly into circuits. In this project though, because there are so many sensors, and each Arduino has so little in the way of memory, I opted for using a few separate Arduinos, and assigning a couple of sensors to each of them.
Separating the sensors onto their own Arduinos effectively simplified the programming, because each component could be tested individually and verified before adding to the sensor network.
Interconnectivity Between Arduinos There are a few options for this, I looked at a few of them in the initial testing.One or more regex patterns which should be matched against the file content.
I am using line protocol and Python to write into InfluxDB. Below is the code that creates DB and working fine. How to write into influxdb using line Protocol with Python.
Ask Question. In Python, how do I read a file line-by-line into a list? Let’s start the REPL now, and import the InfluxDBClient from the python-influxdb library to make sure it was installed: $ python3 Python (default, Mar 9 , ) [GCC Compatible Apple LLVM (clang)] on darwin Type "help", "copyright", "credits" or "license" for more information.
First, create a new InfluxDB object by connecting to a running instance. from influxdb import client as influxdb db = initiativeblog.comDBClient(host, port, username, password, database) Available Functions. Creating Excel files with Python and XlsxWriter.
XlsxWriter is a Python module for creating Excel XLSX files. (Sample code to create the above spreadsheet.)XlsxWriter. XlsxWriter is a Python module that can be used to write text, numbers, formulas and hyperlinks to multiple worksheets in an Excel + XLSX file.
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