Search results

  1. wdariusw

    MSP430 measure power consumption

    Hi again ! KrisBlueNZ said that #3 post power to P5 wont work. Please see now and give opinions about powering MOD1, MOD2 and MSP. Will it work now? thanks !
  2. wdariusw

    Voltage from rotation

    Here i'm again ! :) So, little news from me. Have reed switches, and there are gap beween magnetic fields, so i think reed switches here will work as i want. Another new - made holder for coils. Now positioning is perfect. 5 coils with 400 turns (without cores) . It generates about 700-800mV...
  3. wdariusw

    Schottky rectifier

    This is for low power rectification
  4. wdariusw

    Schottky rectifier

    Very bad thing here... For now it doesn't matter, but for the future.. The device should be as small as possible, and here DIP component like 100uF or more capacitors are very big... :/
  5. wdariusw

    Schottky rectifier

    My generator only have AC smaller than 1V, so 15V reverse voltage is not a bad thing. Thanks for the information, KrisBlueNZ ! HSMS2822 do not fit for rectification. Found this one (in my country 0.32 € each) http://www.nxp.com/documents/data_sheet/PMEG1020EA.pdf . I think with this i will get...
  6. wdariusw

    Schottky rectifier

    Yes, i'm sure that the simulations are the same, same circuit copy-paste, only diodes are changed. Simply bridge rectifier with 100uF capacitor.. From datasheets graphs as i see 1N5817 forward voltage is little bit lower than HSMS2822. But only few mV.
  7. wdariusw

    Schottky rectifier

    Here i have few questions (about diodes) . I need to rectify small AC voltage ~800mV . And here is question - what diode bridge i should use. I know that schottkey here are best, but... Making simulations with TINA-TI software. I have bought few this diodes...
  8. wdariusw

    Specify "shunt resistance" for current measurement

    Yes, i know how to do it with experiments, but sometimes is good to do less experiments , and here calculations helps :) Thanks.
  9. wdariusw

    Specify "shunt resistance" for current measurement

    Hi for all ! Measuring low current with multimeter now, but i want to do it with oscilloscope using shunt resistance voltage drop. How to calculate best resistance value for measuring ? It is 3V power supply, with multimeter i measured ~10mA current. So if i want that my circuit still works, i...
  10. wdariusw

    Voltage from rotation

    Can't imagine simple mechanical solution, that fit here. Cyclist can pedal backwards, sometimes it is needed to do that..
  11. wdariusw

    Voltage from rotation

    Sorry, my mistake...REED switch...Gryd3, here i only need to know or it is clockwise or anticlockwise.
  12. wdariusw

    Voltage from rotation

    Need additional thought friends ! What is the best way to detect correct rotation of magnets ? I had idea to use reel switches, but i think i will be disappointed with that, because magnetic field is strong enough, and do position like this is almost impossible: I do not have reels switches...
  13. wdariusw

    MSP430 measure power consumption

    I'm expecting forever lasting device :D joke. I want to get as low as possible power consumption for my device. Here is algorithm that i want to implement with lowest power consumption:
  14. wdariusw

    MSP430 measure power consumption

    Little news from me. There are some bugs in MSP libs, so insteed _BIS_SR(LPM3_bits + GIE); for go sleep and _BIC_SR(LPM3_EXIT); for wake from sleep need use LMP3; and LMP3_EXIT; functions. Now i have <10uA in LMP3 mode.
  15. wdariusw

    MSP430 measure power consumption

    When I measure current i use 3.3V straight to the pin 1, also no jumpers to emulation part, and no jumpers on LED's. Only MSP. I do it like this : Or insteed multimeter shunt resistance, then voltage drop/resistance = cirrent. Almost same result..
  16. wdariusw

    MSP430 measure power consumption

    For the moment schematic is not completed. Here it is: Need there invert reset signal for msp, also add RF RX module and two reed switches and more.. Now i'm imitating everything on launchpad with button and wires.
  17. wdariusw

    MSP430 measure power consumption

    Hi all ! I'm doing "energy harvester" with wireless sensor node that includes msp430g2553 MCU. Trying to measure power consumtion, but no do not go for now. Using shunt resistor (1k 5%) i have got 345uA for active and 320uA for LPM3 mode. I thout that is something wrong here. Measured using...
  18. wdariusw

    Voltage from rotation

    Can you post link about that crystal cells?
  19. wdariusw

    Voltage from rotation

    Hi friends ! Working now with power management circuit for my generator (until waiting plastic holders for perfect coil-magnets positioning). I will use Texas Instrument bq25504 chip, low power atmega328P (or MSP430G2) and RF module. Now trying understant all bq25504 working principles. Want to...
  20. wdariusw

    Voltage from rotation

    Measured today magnet strenght. Gaussmeter shows 55mT , very low value I think....
Top