Tutorial PCF8574 backpacks for LCD modules and Arduino. September 2014. Learn how to use inexpensive serial backpacks with character LCD modules with your Arduino. An evolving index of knowledge for Freeduino and Arduino compiled from the WWW. F8X/RBGD/IEX4LK5D/F8XRBGDIEX4LK5D.MEDIUM.jpg' alt='Graphing Serial Data Arduino' title='Graphing Serial Data Arduino' />Monitoring the Weather With Influx. DB and Grafana and a Bunch of ArduinosThe weather has always fascinated me, ever since I was a little kid. Watching clouds grow through sunny summer days, the eventual abrupt rainfall and cacophony of an evening thunderstorm. Schritte International 5 Pdf Download'>Schritte International 5 Pdf Download. Sudden run for your life rainfall, and gusty winds that send everything scattered across the yard. Over the years, I have built many little widgets and gadgets for measuring and observing the weather, from homemade anemometers made of 2 liter soda bottles, to seaweed hygrometers and a balloon barometer. Graphing Serial Data Arduino' title='Graphing Serial Data Arduino' />Aqualitative is a kinetic installation that renders forty years of data related to Californias water history into a physical experience. Hi there. I have an issue with graphing, but I think it is something stupid I am doing especially seeing as Im ha, or think I am an old hand at Arduino. Mikes Flight Deck is an introduction to home cockpit building, the hobby that takes off where flight simulation game software ends. When staring at a 17 monitor on. In the next post about my Arduino IMU, I will talk about how gyroscopes work and how to interpret the information they provide. Source ADXL345Accelerometer Arduino. THE CAR HACKERS HANDBOOK. A Guide for the Penetration Tester. Craig Smith. Do you want to a graph on a Cartesian coordinate system on your LCD but dont want to write the code Use mine for free. Personal Website Templates Html5 With Css3 Transform. This code includes a function do. However, this is the Io. T age, and I thought it only right that I have a go at making an internet connected weather station, without just stumping up the money and buying one off the shelf. I have to admit that after some careful experimentation with making my own anemometer and wind direction indicator, that I did end up buying a few bits and bobs off e. Bay to make my life considerably easier, especially in terms of calibration but all the clever stuff in the Arduinos is all mine. Measurements I find interesting and can measure easily Temperature well, duh. Humidity. Wind Speed. Wind Direction. Atmospheric Pressure. Rainfall. Solar Intensity. Air Pollution effectively a measure of particles 1 1. Interesting measurements that are harder to measure Cloud cover Percentage. Air charged particles theoretically a measure of percentage chance of a lightning strikeDew Point Ive tried a number of ways to measure this, but it turns out to be Hard, and easier to measure temperature and humidity and calculate itMaking the Measurements. Temperature. I tried a number of sensors for this, starting off with the DS1. Maxim and eventually settling on the Arduino ubiquitous DHT2. C temperature readings 0. C accuracy. I found the DS1. I moved on and tried a few other sensors including a K type Thermocouple and also a Thermistor which eventually lead me to the DHT1. DHT2. 2 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. The theory in my mind was that if you drive the temperature down by putting power into the Peltier module, when dew forms on the mirror, itll change the refractive index of the mirror and make the light shine somewhere else so the dew could be detected by the 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. I tried a number of control mechanisms, including some proportionalintegralderivative controller PID controller libraries, but couldnt ever get the thing to work right. One of the biggest problems is that Peltier modules draw a lot of current when theyre pumping heat, I think mine was drawing roughly 1. Diplay-Serial-Data-on-Real-Time-Graph-in-Labview.jpg' alt='Graphing Serial Data Arduino' title='Graphing Serial Data Arduino' />A at 1. V and as a result, the switching MOSFET Transistor was getting quite toasty, so I put it on the same heatsink as the hot side of the Peltier module. The hot side DS1. MOSFET on which controlled a cooling fan. Its a promising idea, and Ill probably come back to this one. On the other hand, after I discovered the DHT1. DHT2. 2 sensors, I could get accurate temperature and humidity measurements thrown in for free, in an inexpensive Arduino friendly breakout board format for a nice low price. I think I paid about 3. I bought a half dozen. 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. I definitely wanted something with good bearings so theres as little friction as possible. What has good bearings Ooh. Hard drives. Theyre good. 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. I decided that Id see whether I could use the tiny currents induced in the stepper motor drive coils as the motor turns to drive the wind speed counter. 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 AD6. 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. And it worked.  Until it got wet, then it stopped working until it dried out. So I shelved that idea indefinitely and bought an off the shelf anemometer from e. Bay that cost around 3, and contains a reed switch, which closes once every revolution. 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 theory. In practice, it was a bugger to get working. The black bits were still quite reflective to infrared light, and the shiny bits were so reflective that the signal tended to bleed into the other channels signals. So I ditched this idea and bought a second hand Absolute rotary position encoder off e. Bay. An Omron E6. CP A in case youre curious, which gives a 8 bit, 1. Gray code output, and has a handy 5mm shaft to connect to the wind vane Ive yet to make this bit. Wind direction remains a work in progress. I need to design my wind vane and plasma, cut it, and mount the whole thing to the encoder and write the software for an Arduino to interpret. Atmospheric Pressure. I didnt have any bright ideas of how to measure this from first principles, apart possibly from pointing a camera at a barometer and using open. CV to read it. Trawling e. Bay for interesting Arduino sensors, I discovered the Adafruit BMP1. Pa 1 h. Pa 1 millibar and a temperature sensor thrown in for free which I dont use because I already have the DHT2. 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. The original one used some frequency in the 4. MHz range, and I had a good poke at it with Cubic. SDR, but wasnt able to make any sense of the frequency and encoding it used, so I took a different route. I hooked it up to its wireless receiver and tipped the bucket. The metered rainfall showed 0. I knew that one bucket tip equated to 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.