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Recent content by mdUJ

  1. M

    What´s the sense of Points and Level?

    Hello shahbaz.ele, thank you for that link. As far as I can see this does not explain the issue I asked for - "What is the sense of Points and Level?". There was the statement "Post it to the moderators or pm to them" in the previous contribution. Is the answer that secret? A kind of mystery...
  2. M

    Scoreboard display on LCD (edsim51)

    Hi, if you have no other task, then polled reading of the keys is fine. So let´s do some pseudo code in C: if (switch1 == low) { if (digit1 < 9) { digit1++; } // Wait until Switch1 is released again while (switch1 == low) { } } else if (switch2 == low) { if (digit1 > 0)...
  3. M

    Double resolution of a rotary encoder

    Hi, there is no need for any schematics. A rotary encoder has normally 2 outputs. Let´s call it S0 and S90. S90 is 90 degree shifted in phase related to S0. Connect S0 to PD2 and S90 to PD3. You can also connect S90 to PD2 and S0 to PD3, but then the sense of rotation will change. Many rotary...
  4. M

    What´s the sense of Points and Level?

    Hi, may be it´s a little stupid - but I don´t understand for which reason a member can get points and can get to a higher level. What´s the benefit of getting points? Regards Udo
  5. M

    help required to learn ARM lpc 2148

    Hi, yes, the LPC2000 family has the same core. They differ in speed, peripherals and memory. Regards Udo
  6. M

    Double resolution of a rotary encoder

    Hello, years ago I made a program to control an inverted pendulum. To increase the system resolution for better control, I doubled the encoder resolution by software. Here is the code. It is written for ATmega88 - may be someone can use it. // Port and Pin definitions for Rotary Encoder...
  7. M

    accelerometer scale factor elementary question

    Hello FvM, Where do you see values like "5V" or the resolution of a "10-bit ADC" in the calculation? That´s the nice thing of this way to calculate the acceleration. It works even without knowing the sensivity (+-mV/g), the full scale (+-x.xg) of the accelerometer, the ADC resolution and...
  8. M

    Programming PID into P18f4520

    Hi, how do you read the ball position? Which kind of sensor? Which actuator you are using to tilt the beam? A photo would be nice... Regards Udo
  9. M

    accelerometer scale factor elementary question

    Hi, it´s quite easy to calculate the acceleration for every axis. Put your accelerometer flat on the table. It will output the bias values for X- and Y-axis (acc_x_bias). If you are using a 3-axis accelerometer, then the Z-axis will output the value for -1g. Now rotate the a accelerometer 90...
  10. M

    help required to learn ARM lpc 2148

    Try this PDF. It´s old but valid for all ARM7 TDMI devices. http://embedded.ifmo.ru/sdk/sdk20/components/mcu/lpc-ARM-book_srn.pdf Regards Udo
  11. M

    code for PID control using PIC16F877 in mikroC

    Hi, I´v done a float based PID some time ago. May be it helps... // C-File // Module..: PID.C // Version.: 1.0 // Compiler: IAR ARM // Date....: August 2007 // Chip....: STM32 //----------------------------------------------------------------------------- #include "pid.h"...
  12. M

    Isolated Keyword Recognition

    Hello, I would like to start a project where a small robot can be commanded by some spoken keywords. It should be based on 32-bit devices like ARM7 / Cortex M3/M4 devices. Does anyone know a solution for this? Regards Udo

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