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  1. wdariusw

    Voltage from rotation

    I know that. But idea is - no external power supply. Energy from rotation
  2. wdariusw

    Voltage from rotation

    Ok :) The purpose of that system would be detect rotation of bike pedals, and i need to send minimum 4 signals in one rotation.
  3. wdariusw

    Voltage from rotation

    How do you think, it is possible to make system, that in one rotation send 4 or more RF signals ?
  4. wdariusw

    23HY56-25-4A stepper

    I think it want to get more current.....will try to buy driver module now. When I will have time, will do own driver..
  5. wdariusw

    23HY56-25-4A stepper

    In #3 post I wrote bad pattern. In my program pattern is 0x01 0x04 0x02 0x08 . Here my code : #include <avr/io.h> #include <util/delay.h> int main (void) { unsigned int step_delay=3500; DDRB=DDRB|0x01; PORTB=PORTB|0x01; //button on port B pin 0 DDRA=DDRA|0x0F; //output pins for stepper...
  6. wdariusw

    23HY56-25-4A stepper

    I used 4 steps combination 0x01 0x40 0x20 0x80 (""Step Sequence for Bipolar stepper motor"" http://www.8051projects.net/stepper-motor-interfacing/step-sequence.php). As i remember the delay between steps was about 3-4ms, so frequency between steps is about 250-333 Hz. When I increase frequency...
  7. wdariusw

    23HY56-25-4A stepper

    Hi ! I'm trying to try what this stepper can. I'm new with steppers. So, about 23HY56-25-4A stepper there not much info http://www.ms-motor.com/product_detail-30-en.html . When trying maximum speed, aproximately i have about 1.5 rotations per second, what is 90RPM. Can't find manufacturer RPM...
  8. wdariusw

    How to wire an A & V meter to a solar panel?

    Wire as I said. And yes - with separete power supply ( i wrote, that connect to the battery).
  9. wdariusw

    How to wire an A & V meter to a solar panel?

    Show your volt/amp meter. Try like this - connect thin red to battery positive, thin black to battery negative (it is power for your volt/amp meter) now connect thick RED wire to solar panel positive wire. Now you should see solar panel voltage on the screen. For current mostly is shunt...
  10. wdariusw

    How to wire an A & V meter to a solar panel?

    Hi Albert ! I think you have somethink like this, take a look http://cdn.instructables.com/FTA/SMBZ/I06J81P1/FTASMBZI06J81P1.LARGE.jpg . Recently i was interested with solar cells. Do you have mppt charger ? It would help a little bit in bad conditions. And what type of solar panel you have...
  11. wdariusw

    Simple project needed

    There is enough current for bipolar or voltage for mosfet from radio ? impos1 - solid state relay is transistor driven relay, so you can do simplier without it. Or if you have bought ssr, then no problems (if there us enough power to drive it)
  12. wdariusw

    Simple project needed

    Microcontroller + microphone + programming skills. You need to "listen" for the radio alarm, which is trigger to microcontroller, and turn on your vibrating motor. It is not simple as single transistor, but it is better and much interested i think:)
  13. wdariusw

    Voltage from rotation

    Hi all. I will try to do some experiments, but before it i want to make calculations to estimate the results depending on geometry, coil, airgap, etc. So, the idea is : magnets are spinning around the axis and at the end of coil voltage is induced. Coil is connected to electronic circuit. With...
  14. wdariusw

    3 watt LED mounting..

    I do not know, but maybe you can use TEG as with heatsink.
  15. wdariusw

    capacitors instead of rechargeable batteries

    I think i found everything what I need here : http://www.johnhearfield.com/Physics/Capacitor_energy.htm :)
  16. wdariusw

    capacitors instead of rechargeable batteries

    Very interesting topic. There is formula to calculate capacitance into mAh of something ? Let's say I have 180mAh battery, what capacitor (super-capacitor) i need ?
  17. wdariusw

    Energy harvesting from solar panel

    In that site about MPPT are example with battery. So if solar panel gives 5V and 0.2amps and i connected 3.6V battery straight, then solar panel voltage drops to the battery level and power is P=3.6*0.2=0.72W. 5-3.6=1.4V is wasted. So if between solar panel and battery is connected buck...
  18. wdariusw

    Energy harvesting from solar panel

    No, i think that 4.4W will be in perfect conditions, when irradiance is very high, and load is matched ... In my example, increased load is show as work point changes to the left (current increases, load resistance decreases).. After you answer now i'm thinking...I always thought that MPPT...
  19. wdariusw

    Energy harvesting from solar panel

    There is storm in my head ! Step by step something is coming (i hope it will be understanding...:D ).. Tried to do some calculations. Please look at attached file and comment or this time i'm thinking correctly. :)
  20. wdariusw

    Energy harvesting from solar panel

    Nice ! Example for understanding : So i connected MCU as a solar panel load. MCU wake up from sleep and measure sensors values, the current consumption will increase, and load to solar panel increase, but load resistance decrease assuming R=U/I? So, if there are DC-DC buck between solar cell...
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