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  1. evol_w10lv

    Looking for 3-axis magnetometer chip

    Yes, but the main aim is to develop system that works when GPS not available (underground parking zones, signal obstructed by tree canopy, buildings, other obstructed areas, etc). Also, when using magnetometer, we can determine heading respect to magnetic north. Unfortunately magnetometer is...
  2. evol_w10lv

    Looking for 3-axis magnetometer chip

    Thanks for replying. The aim is to use all three sensors (accelerometer, gyro, magnetometer). We know that cheap gyro sensors drift over a time significantly when standing still. So the task is to develop algorithm, that recognize the moment when gyro starts drifting and then use magnetometer as...
  3. evol_w10lv

    Looking for 3-axis magnetometer chip

    Xtrinsic MAG3110 - output data rate only 80 Hz HMC5883L - 12-Bit ADC (I guess 16-bit would be more precise) As I said, haven't work with them.. so I don't know how really good they are. Also think AMR (anisotropic magnetoresistance) type would be most appropriate for inertial navigation...
  4. evol_w10lv

    Looking for 3-axis magnetometer chip

    Can anyone suggest very good three axis magnetometer chip? I found few: http://cache.freescale.com/files/sensors/doc/data_sheet/MAG3110.pdf https://www.adafruit.com/datasheets/HMC5883L_3-Axis_Digital_Compass_IC.pdf http://www.st.com/web/en/resource/technical/document/datasheet/DM00075867.pdf...
  5. evol_w10lv

    8086, DAC project and schematic

    The task is to choose all elements, which I need to make project with DAC0808 and draw my own schematic. CPU is 8086. In real life we are using 8086 board, all is connected, schematic will be just projection. I need 8086, clock generator, memory, dac0808 and keypad+lcd (for program input in...
  6. evol_w10lv

    7seg display transistor and resistor values.

    I want to connect PIC16F690 (http://ww1.microchip.com/downloads/en/DeviceDoc/41262C.pdf) with 7seg display. Have got this model: ELT-511SURWA/S530-A3 (datasheet: http://www.datasheets360.com/pdf/-3210061775093412092) Forward current-Max: If = 0.025 A Forward voltage-Typ: Vf = 2 V R =...
  7. evol_w10lv

    Xsens sensor.

    Hmm.. d - distance. If angle is in I quadrant, I can calculate next coordinates like this: Let's imagine, that angle is in other quadrant, for example, 320 degrees. I see, that I can't sum x y to get next coordinates, here I must subtract. I can calculate 'green' X Y using sin and cos like...
  8. evol_w10lv

    Xsens sensor.

    I'm trying to plot motion in x, y coordinate system in meters. I can integrate twice resulting acceleration vector to get distance in meters. And I have got bearing angles calculated from magnetometer. I want to understand principle, how to plot this graph. If X1=0, Y1=0 (initial conditions)...
  9. evol_w10lv

    Xsens sensor.

    I'm doing project using xsens MTi-G. Data file (gyroscope, accelerometer, magnetometer, Euler angles, GPS data): I can get direction in degrees (heading) from magnetometer, using magnetometer coordinates. What else I could explore, calculate, compare?
  10. evol_w10lv

    MTS51 schematic for speaker

    Ohh.. I'm sorry, but here was a misunderstanding with this task. I really have to use details, components like they are in the MTS51 book, because the task is to show, how it's working there. I add attachment with some drawings. I included RS232 and MAX323 in my schematic to show, how it's...
  11. evol_w10lv

    MTS51 schematic for speaker

    Maybe I didn't mention some details in may first post. We are programming MTS-51 from PC using RS-232 connection and COM port, just loading the .hex file to MTS-51, but the task is to make principal and functional schematics. Inverter (model - 74LS14) also is in MTS-51 Trainer book speaker...
  12. evol_w10lv

    MTS51 schematic for speaker

    I'm doing a little project on MTS51 Microcomputer trainer using speaker. Microcontroller: P89C51RC+ Can someone check my schematic? And what about values C1, C2, C3, R2? I have to search information in P89C51RC+ datasheet or values should be calculated?
  13. evol_w10lv

    RAM simulation using Multisim

    Thank for your help again. Now all should be clear. :) And yes, it's like a project. The task is to simulate even 256x8 RAM and discribe it.
  14. evol_w10lv

    RAM simulation using Multisim

    At least I start to understand it.. For example, without any simulation, maybe to explain RAM'S work in my homework, I can use something like that: Then if there will be CPU or microcontroller, BUS1 to microcontroller's input, microcontroller's output to BUS2, BUS2 to RAM's input, RAM'S output...
  15. evol_w10lv

    RAM simulation using Multisim

    Thanks for helping. :) At least I'm back.. unfortunately I have got one misunderstanding again. We know that data writes into array like this: Of course in my simulation not array, there I can just understand write and read options/functions, so I use just column address. But what about row...
  16. evol_w10lv

    Op-amp circuit analysis using a transfer function

    I have got transfer functions W(s) and Wk(s), where Wk(s) is correction transfer function. So I calculate W(s) and Wk(s) in series. Magnitude graph before correction: Magnitude graph after correction: But the task is to make whole circuit and simulate it. First of all, I tried to make it by...
  17. evol_w10lv

    RAM simulation using Multisim

    I guess, it will be good enough without simplifying these switches. Speaking about datasheet, you were using this one http://www.alldatasheet.com/datasheet-pdf/pdf/77359/HITACHI/HM6116.html? for data? Multisim says that it's 2Kx8 RAM 200nS. So.. this is access time? But I don't understand...
  18. evol_w10lv

    RAM simulation using Multisim

    Nice idea about buffer ICs. I made some corrections: And here is an example: Is it looks good enough for you? When OE (Read) is ON, I can see ligths on. When OE is OFF, lights are off, as it should be. But using this simulaton, I can write data even then, when WE (Write) is OFF. I guess...
  19. evol_w10lv

    RAM simulation using Multisim

    It's OK now with that warning message. And it's clear about CS line, but now I have got other misunderstanding: I was wrong there with probes. Actually, I want to see results of simulation, when I'm simulating "write" and "read" operation. It means, I have to somehow use buffer memory there...
  20. evol_w10lv

    RAM simulation using Multisim

    I tried something like this: There was notification - "Placing a wire over a junction is not allowed." What's wrong there? And what about schematics? Is it looks correct? Also.. I guess, WE and OE must never both be active at the same time.. so I have to use other switch?
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