Description
This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip switches and ends 32 minutes later. The 32 minute duration is set by selecting the 5th bit (2^5 = 32) of a 4040 binary counter (pin 2). The timer also has a manual toggle switch so the load can be manually switched on or off and automatically shuts off after 32 minutes. The time duration can be longer or shorter (8,16,32,64,128,256 minutes etc.) by selecting the appropriate bit of the counter. The timer circuit is shown in the lower schematic just above the regulator.
The basic clock circuit (top schematic below) is similar to the binary clock (on another page) and uses 7 ICs to produce the 20 digital bits for 12 hour time, plus AM and PM. A standard watch crystal oscillator (32,768) is used as the time base and is divided down to 1/2 half second by the 4020 binary counter. One half of a 4013 data latch is used to divide the 1/2 second signal by 2 and produce a one second pulse that drives the seconds counter (74HC390 colored purple). The minutes are advanced by decoding 60 seconds (40 + 20) and then resetting the seconds counter to 0 and at the same time advancing the minutes counter. The same procedure is used to advance the hours. The second half of the 4013 latch is used to indicate AM or PM and is toggled by decoding 13 hours and resetting the hours to 0 and then advancing the hours to 'one'.
Smart car TPMS tire pressure monitoring system solar digital clock LCD display car tire pressure temperature safety alarm system. The latest tech news about hardware, 5G, apps, electronics, and more. With huge companies like Google, Apple, and Amazon drawing your attention in different directions, Digital Trends offers in.
The clock display circuit is shown in the second drawing below and uses 6 more ICs to decode the binary data and drive four seven segment LED displays. The 10s of hours digit is driven with a single 3904 transistor. Two multiplexer circuits (4053) are used to manually select either minutes or seconds for the right two display digits. The two switches shown between the 4053s and below the left 4053 are both part of one DPDT switch which selects either seconds or minutes for the 1X and 10X digits. This switch is shown in the seconds position and the hours digits are blanked with a low signal on pin 4 of the 4511. The display can also be toggled on and off (totally blank) using a set/reset latch made from a couple 74HC00 NAND gates. A momentary DPDT switch is used to control the latch and toggle the display on or off. The second pole of this switch is used on the upper drawing (connected to the run/stop switch) to set the hours and minutes. Thus this same switch performs both functions of blanking the display and setting the time. The run/stop switch is shown in the normal running mode and supplies a low signal to a NAND gate which prevents accidental setting the time while the clock is running. The run/stop switch also turns on the display (through the diode D2) when in the stop position. The procedure for setting the clock would be to set the (run/stop) switch the stop position and the (seconds/minutes) switch to the minutes position. Then toggle the momentary switch to set minutes and hours of the current time plus one minute. The clock can then be started with the run/stop switch at precisely the right time (+/- 0.5 seconds).
Solar Digital Clock
The voltage regulator in the lower drawing maintains the battery at 13.6 volts and also supplies the clock and timer circuits with 4.3 volts. The charge LED indicator only comes on when the regulator is supplying max charge to the battery. When the battery voltage reaches 13.6 the regulator reduces the current to whatever is necessary to maintain the voltage and the charge indicator will turn off. The unit I built also included a battery condition indicator (voltmeter using 4 LEDs) to indicate the battery condition so that a failure of the regulator would be indicated by the charge indicator LED turned off and less than 4 LEDs lit on the voltmeter. The 4 LED battery condition indicator is shown on another page.
Small Solar Digital Clock
Basic Clock CircuitClock Display CircuitClock Timer CircuitVoltage Regulator (13.6 volts)Универсальный англо-русский словарь. Академик.ру. 2011.
Смотреть что такое 'solar clock' в других словарях:
Смотреть что такое 'solar clock' в других словарях:
Solar hot water — is water heated by the use of solar energy. Solar heating systems are generally composed of solar thermal collectors, a fluid system to move the heat from the collector to its point of usage. The system may use electricity for pumping the fluid,… … Wikipedia
Solar time — On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant … Wikipedia
Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London … Wikipedia
Clock of the Long Now — The first prototype, on display at the Science Museum in London. The Clock of the Long Now, also called the 10,000 year clock, is a proposed mechanical clock designed to keep time for 10,000 years. The project to build it is part of the Long Now… … Wikipedia
Solar power satellite — A solar power satellite, or SPS or Powersat, as originally proposed would be a satellite built in high Earth orbit that uses microwave power transmission to beam solar power to a very large antenna on Earth. Advantages of placing the solar… … Wikipedia
Solar power in Spain — Spain is one of the most attractive countries for the development of solar energy, as it has more available sunshine than any other European country. The Spanish government is committed to achieving a target of 12 percent of primary energy from… … Wikipedia
Solar tracker — A solar tracker is a device for orienting a solar photovoltaic panel or concentrating solar reflector or lens toward the sun. The sun s position in the sky varies both with the seasons (elevation) and time of day as the sun moves across the sky.… … Wikipedia
Solar Monitoring Observatory — El Observatorio de The Solar Monitoring Observatory is externally mounted on the Columbus Laboratory. El Solar Monitoring Observatory (SOLAR / SMO), que significa Observatorio de Monitorización Solar, es un observatorio científico de la ESA que… … Wikipedia Español
Solar Monitoring Observatory — The Solar Monitoring Observatory (SOLAR / SMO) is an ESA science observatory that is part of the Columbus Laboratory, which is a component of the International Space Station. The Columbus module (including SOLAR) was launched February 2008 aboard … Wikipedia
Solar Resource — The Solar Resource was an Australian entry in the inaugural World Solar Challenge race then known as the Pentax World Solar Challenge race in 1987. The Solar Resource was one of 24 entries from 7 countries (Australia, Denmark, Japan, Pakistan,… … Wikipedia
Solar hour — Hour Hour, n. [OE. hour, our, hore, ure, OF. hore, ore, ure, F. heure, L. hora, fr. Gr. ?, orig., a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See {Year}, and cf. {Horologe}, {Horoscope}.] 1. The … The Collaborative International Dictionary of English
Книги
Digital Solar Clock 3d Print
- How Your House Works. A Visual Guide to Understanding and Maintaining Your Home, Charlie Wing. The updated and highly illustrated guide to understanding how just about everything in your house works! The revised and updated third edition of How Your House Works is a hands-on guide that… ПодробнееКупить за 1817.85 рубэлектронная книга
