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Recent content by freddyp007

  1. freddyp007

    [General] Weird problem with Intel Edison and IMU MPU-9150

    Hi guys, So I am trying to get measurements from the MPU-9150 sensor from Invensense using the Intel Edison. I am able to communicate with the sensor and the values seem sensible. But after a specific number of cycles, I measure only a zero from all data registers. This error is repeatable...
  2. freddyp007

    LED requirements to glow

    The LED is just another diode. The voltage and current are exponentially related. That means even a small change in voltage might cause a drastic change in current. So you must limit the current flowing through it using an appropriate resistor. For more info refer the following link. Light...
  3. freddyp007

    problem Interfacing 16x2 lcs display with at89c51 microcontroller

    :!:Whenever you use the internal flash-ROM of 8051, connect the EA(pin 31) to VCC. If at all you need an external ROM you have to ground it since it is active 'low'. So, in the hardware connect pin 31 to VCC. P.S. Proteus does not take that into account, so you got the result in simulation
  4. freddyp007

    Berg strip cuttent capacity

    Berg strip current capacity How many mAmps current can a typical 2.54mm pitch berg strip carry? ref:pic
  5. freddyp007

    problem Interfacing 16x2 lcs display with at89c51 microcontroller

    Where is the circuit diagram mate?
  6. freddyp007

    problem Interfacing 16x2 lcs display with at89c51 microcontroller

    Check whether you have connected the data pins of the LCD in order. i.e. D0 to P1_0; D1 to P1_1 etc. Maybe you got every connection ok. Then check the microcontroller by writing a simple test program.
  7. freddyp007

    IR remote temperature reader project

    Explain about it a little more.
  8. freddyp007

    atmega 16 adc problem

    That's pretty simple. Look for ADLAR bit in the ADMUX register. When it is written a '0', 10-bit resolution is selected and the lower 8-bits are stored in the ADCL register and the remaining two bits are stored in the ADCH reg. When you write a '1' to the ADLAR bit, 8-bit resolution is selected...
  9. freddyp007

    [SOLVED] Serial data buffer help

    Hi, I have 2 bytes of data to transmit serially. At the receiver, i want to compare the bytes. Do i need to use a array to buffer the serial data? Or is there any other way it can be done?8-)
  10. freddyp007

    Accelerometer data transmission

    I am using a three-dimensional accelerometer. I am planning to use x and y axis for my project. I have connected the two axis to the ADC of my atmega32. So, i'll be getting two 8-bit values of ADC. I want to transmit them through zigbee. How will i know which axis has been received at the other...
  11. freddyp007

    [SOLVED] Zigbee level conversion

    I m using the zigbee provided in the link XBee Wireless Communication Module (chip antenna) - nex-robotics
  12. freddyp007

    [SOLVED] Zigbee level conversion

    I am trying to interface zigbee with my atmega32. Can i directly connect the Tx and Rx pins? Or do I need a level convertor?:?:
  13. freddyp007

    Create an IR sensor to switch on and off lights when someone enters or exits the room

    Hi, You can use TSOP1738 IR receivers. They are easily available and are commonly used in TV remote control receivers. But they are excited only by an IR radiation of frequency 38kHz. So, you also need a 38Khz astable oscillator using 555 timer.Refer the following circuit for emitter. For that...
  14. freddyp007

    [SOLVED] Sugessions for 3.3v regulators

    I'll stick with lm317 since i'm gonna use 12v. I have lm1117 but don't have tantalum SMD capacitors.
  15. freddyp007

    [SOLVED] Sugessions for 3.3v regulators

    My supply voltage is either 5v or 12v. I need around 200mA.

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