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Eleminating noise from sensor readings on Arduino with digital filtering. I use two LM35 temperature sensors to measure beer and fridge temperature in my UberFridge project.

Eleminating noise from sensor readings on Arduino with digital filtering

These sensors output 10 mV/°C, so for my fridge the output ranges between 40 and 300 mV. I wanted to be able to measure differences of 0.1 °C, so 1 mV. That is a very small voltage difference to measure in the presence of noise, so I implemented multiple filters to get rid of noise and increase accuracy. The sensor circuit. Methode der kleinsten Quadrate. Die Methode der kleinsten Quadrate ist das mathematische Standardverfahren zur Ausgleichungsrechnung.

Methode der kleinsten Quadrate

Dabei wird zu einer Datenpunktwolke eine Kurve gesucht, die möglichst nahe an den Datenpunkten verläuft. Messpunkte und deren Abstand zu einer nach der Methode der kleinsten Quadrate bestimmten Funktion. Hier wurde eine logistische Funktion als Modellkurve gewählt. In der Stochastik wird die Methode der kleinsten Quadrate meistens als Schätzmethode in der Regressionsanalyse benutzt, wo sie auch als Kleinste-Quadrate-Schätzung bezeichnet wird.

Angewandt als Systemidentifikation ist die Methode der kleinsten Quadrate in Verbindung mit Modellversuchen z. Geschichte[Bearbeiten] Die Grundlagen seines Verfahrens hatte Gauß schon 1795 im Alter von 18 Jahren entwickelt. Der französische Vermessungsoffizier André-Louis Cholesky entwickelte während des Ersten Weltkrieges die Cholesky-Zerlegung, die gegenüber den Lösungsverfahren von Gauß nochmal einen erheblichen Effizienzgewinn darstellte. Intuition, theory, simulation, experiments. I had to control a couple of Servos and ESCs for the quadrotor.

intuition, theory, simulation, experiments

I am suing Arduino due because it has a higher speed 84MHz with which we can do a lot of computation. The PWM pins labelled on the Due board are configured to have a 1000hz frequency by default. But the servos and escs need a frequency of about 50Hz. Arduino Due PWM Frequency. Looks like making the following simple changes in variant.h in the Arduino library did the trick, and doesn't appear to mess up things like delay(), micros(), or ADC sample rate.

Arduino Due PWM Frequency

I'm now getting 20KHz PWM on Pins 2-9. Code: Select all | TOGGLE FULL SIZE .../* * PWM */#define PWM_INTERFACE PWM#define PWM_INTERFACE_ID ID_PWM//#define PWM_FREQUENCY 1000 // <----- original#define PWM_FREQUENCY 20000 // <----- change#define PWM_MAX_DUTY_CYCLE 255#define PWM_MIN_DUTY_CYCLE 0#define PWM_RESOLUTION 8. On Arduino Due PWM Frequency. I just got myself a couple of Arduino Due boards.

On Arduino Due PWM Frequency

While they were released almost two years ago, I have not really got a chance to look at these until quite recently. Arduino Due is based on Atmel’s ATSAM3x8E 32-bit ARM Cortext-M3 processor. The processor core runs at 84 MHz, which is significantly faster than its 8-bit AVR counterpart ATmega328p which runs at 16 MHz. For an ATmega328p, the highest achievable PWM frequency is 8Mhz (square wave), so we should be able to generate much higher frequency signals on an Arduino Due. But how high can we go? If you use the bit-banging method (e.g. pin toggling), the highest achievable output frequency is actually quite abysmal. The Arduino code base is not very efficient and this code is actually not much faster than the same code on an ATmega328p (126.2 kHz for comparison, compiled with Arduino 1.0.5). Of course, we can improve the code efficiency above quite a bit by using direct port manipulation.

Be Sociable, Share! CAAD Embedded hosted by ETH Zürich - TimerDcMotorBackground. Examples - HowTo - TimerDCMotorBackground This Article is a collection of some Background Knowledge and some code-snippets i used for the Embossing Printer Project and therefor mostly how to control a DC Motor.

CAAD Embedded hosted by ETH Zürich - TimerDcMotorBackground

Additionally you will find some informations and links concerning Timers/Counters, PWM and working with you Micro-Controller at Bitlevel. Overview. Programming tips, code and tutorials. Introduction In this edition of the continuing series of articles uncovering the mysteries of the Arduino Due we will be tackling the problem of creating a Pulse Width Modulation (PWM) signal. To do this we will use two techniques; first the old fashion way with a timer and secondly with the PWM Controller which is specific to the SAM3X8E processor. If you look at the pinout for the Arduino Due you will see that Pins 2-13 are set aside for PWM with 4 of them using the PWM Controller and the rest use the various timer channels.

The Arduibo Due is powered by 3.3V and it's I/O lines ARE NOT 5V tolerant. Each pin can source a current of 3 mA or 15 mA, depending on the pin, or sink a current of 6 mA or 9 mA, depending on the pin with a total of 130mA DC Output Current on all I/O lines. Pulse Width Modulation (PWM) what is it and why do we need it? Arduino Due in Atmel Studio using C - CodeTron. The Arduino Due is a SAM3X8E based microcontroller board.

Arduino Due in Atmel Studio using C - CodeTron

The Atmel SAM3X8E ARM Cortex-M3 CPU is a powerful 32-bit ARM controller running on a 84 MHz clock. It is very easy to get started using the Arduino software. But i wanted to do something different and program the controller on a register based level using plain C. As a development IDE i am using the Atmel Studio 6 software which has an integrated compiler that generates a basic intel hex or binary file. Due. To connect the Arduino Due to your computer, you'll need a Micro-B USB cable.

Due

The USB cable will provide power and allow you to program the board. Attach the USB micro side of the USB cable to the Due's Programming port (this is the port closer to the DC power connector). AnalogReadResolution. Reference Language | Libraries | Comparison | Changes Description analogReadResolution() is an extension of the Analog API for the Arduino Due and Zero.

AnalogReadResolution

Sets the size (in bits) of the value returned by analogRead(). It defaults to 10 bits (returns values between 0-1023) for backward compatibility with AVR based boards. The Due and the Zero have 12-bit ADC capabilities that can be accessed by changing the resolution to 12. Syntax. Programming tips, code and tutorials. Arduino Due PWM Frequency. Arduino Due PWM Frequency. Intuition, theory, simulation, experiments. On Arduino Due PWM Frequency.