I tested the cell in full sunlight and it just scraped a little over 2volts. Though when lightly loaded it could move quick enough to come close to discriminating different levels of "Dusk" if required. Very overcast today so I can not begin to check it. The 10k resistor is too light a load on the square solar cell as it climbs to near peak voltage early in the morning, even without direct sunlight. So it maybe possible to just go with the circular system and use a voltage divider and the computer (UV sensor and Lightning detector) et al will be the load?Īnd Terry, I never thought a sunset could be so complicated, nice work though!! I have wondered, if it was possible to establish a self correcting clock by averaging the time between Sunset and Sunrise to find the middle of the day, and hence have the clock self correct (mmmm rather than jumping around in the middle of the day, which could be disconcerting, so perhaps averaging the darkness would work, and center adjustments on midnight?). I intend to use the circular cell(s) to charge the battery that will ultimately power the sensor. Whereas the circular type generates about 5-6V!! So it must have a couple of cells in series inside the one package. The smaller square one is the type I am recommending. The two cells in the attached photo are different. However for others who try this, find the maximum voltage of your solar cell before you ignore wawa's advice. I don't think the Arduino Pro is likely to fire up on 2V, maybe 2.5V. The system has a rechargable cadmium cell inside (only 1.2V) and the LED is white so probably requires about 3V at least, hence the little inverter chip. It would be interesting to see if you can tell the difference between these, with a higher resistance load. In the beginning of morning astronomical twilight and at the end of astronomical twilight in the evening, sky illumination is very faint, and might be undetectable. The sun does not contribute to the illumination of the sky before this time in the morning, or after this time in the evening. The time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset. Ordinary outdoor activities are not possible at this time without extra illumination. The horizon is well defined and the outline of objects might be visible without artificial light. The time period when the sun is between 6 and 12 degrees below the horizon at either sunrise or sunset. One still should be able to carry on ordinary outdoor activities. The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions (i.e. The time period when the sun is no more than 6 degrees below the horizon at either sunrise or sunset. Nautical Twilight 5:35 AM EST 5:31 PM ESTĪstronomical Twilight 5:01 AM EST 6:05 PM EST Mine today are like this: Civil Twilight 6:10 AM EST 4:56 PM EST There are 3 different definitions of dusk/dark. Might be interesting to find the statistics for your location/date.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |