Arduino RTCReal Time Clock DS1307. Microcontroller PIC Projects are categorized on the basis of microcontroller applications. Microchip pic microcontrollers belongs to modern family of MCUs. Every AVR has a set of pins that are the programming pins, you just have to connect the programmer to those pins in the right order and presto you are ready to. Arduino Astronomical Clock for Automatic Light Control. Details. Category electronicsanddiyelectronicsanddiy. Published 0. 6 November 2. November 2. 01. 3My garden features a set of garden lamps which I turn on at night. Arduino Astronomical Clock for Automatic Light Control. There are many ways to automatically control these lights. The gadget I was using until I completed this project, that is was a simple mechanical timer. Learn to design a Real Time Clock using 8051 micro controller and DS1307 RTC module. Anurag 9 Pro Crack. The program is written in Embedded C for Interfacing RTC to 8051. Easily Learn about and create pic projects such as a Real Time Clock, an Ultrasonic rangefinder, a frequency counter, an 8x8 LED matrix driver, an RGB LED controller. PICAXE Programming Editor 5 is the legacy software for programming, testing and simulating BASIC programs for PICAXE. Basic electronics and hobby projects featuring Arduino, Picaxe, Microchip PIC. I spend a fair amount of time zipping around town on my scooter, and thought it would be cool to add a voltage monitor to warn when the battery might need recharging. Blog Entry Using Maxim DS1307 Real Time Clock with Atmel AVR Microcontroller May 11, 2009 by rwb, under Microcontroller. Building our own digital clock is one of the. This product allows you to set separate turn on and turn off times and those repeat every day. The disadvantage of this product is that, as the seasons change, you need to constantly adjust the turn on and turn off times. As illustrated in Figure 1, the variation over the year in sunset time in this example is very significant even at my Northern California latitude, with almost three hours difference between the earlier and latest sunset times Figure 1 Sunset time variation at my location note time axis is DST time a. Another approach to this problem, and one that you often find in many beginner elecronics projects, is to turn the lights ONOFF based on some photo sensitive device a LDR or a photo transistor for example. QoFGplCIM/VIL1IPYPrHI/AAAAAAAADUM/SgSVOlQx-qM/s1600/arduino_rtc.png' alt='Ds1307 Programming' title='Ds1307 Programming' />While this approach can be made to work reasonably well, its not without its issues. Its hard to choose a threshold that wont either turn the lights ON too late or turn them OFF too early. In very cloudy days, you run the risk that the system will turn on unnecessarily. Furthermore, if a leave or some other object obstructs the light sensor, the device wont work properly. Its not a very robust approach. My objective with this project was to build a system that, given my latitude and longitude coordinates and the current timeday of the year, automatically calculates the sunrise and sunset times, controlling the lights accordingly. There are of course commercial products that do this see this one from Amazon for example, but it is so much more fun to build one So here are the featuresobjectives for this project Automatic sunrise and sunset relay control to turn lights or some other AC load onoff respectively 7 segment display continuously shows time, estimated sunrise and sunset time Simple PlusMinus push buttons to adjust time manually i. PC Automatic Daylight Savings Time DST adjustments Battery backed time restores correct time following a power failure. USB port access for software debug and upgrade. Ive been looking for an excuse to get myself into the Arduino world and this project seemed like a good candidate. In fact, one can learn quite a bit about Arduino programming by implementing a system like this. And so was born the Arduino Astronomical Clock for Automatic Light Control. Lets jump in. Theory of operation. As shown in Figure 1, the sunset and sunrise times follow an almost sinusoidal pattern over the year. The actual formula is a little more complicated than that, and for those curious about these things, there is an excellent resource at this website with more details http williams. The beauty of the Arduino open source community is that youll often find someone already implemented code to do something similar to what you are intending to do. This project is no exception see Credits section at the end for more info, and fortunately for me, the good folks at swfltek. Timelord library http www. The Timelord library does a great job of calculating sunrise and sunset times for a given latitudelongitude and present time. The library also includes a handy automatic DST time conversion method that I used as well in this project. The code must also take care of determining current time, driving the 7 segment display, and handle the time adjustment buttons. For the time keeping function, I decided to use an inexpensive DS1. Real Time clock RTC from ebay. The great thing about this item is that it is battery backed, so once time is set for the first time, it remains relatively accurate even if theres a power failure. Some drift is expected over time with such a budget oscillator, but the time adjustment buttons should enable us to compensate that should it be needed. So far, it has proven quite accurate. There are also equivalent modules from Adafruit or Sparkfun that you could use. The 4 digit seven segment display is driven in the common time multiplexed way. For the manual button driven time adjustment, I chose a PLUSMINUS three speed button arrangement. This is my favorite arguably most elegant clock time adjustment method. My car uses it, and I liked it so much that I decided to replicate it in software. Basically the PLUS button increments the time whereas the MINUS decrements it. If you hold any of these buttons for longer than 4s, then it enters a second speed, and later on a third speed where the increment decrement is faster. Its intuitive, simple, and works quite well. So without further ado, lets look at the implementation. Hardware. The Arduino is the brains of the project. The Arduino Uno board is considered the reference platform in the Arduino family, and its the one I used also because I had one just laying around. I reckon you could also use an Arduino Nano for a smaller footprint. Most of the IOs were used in this project, so I wouldnt recommend a limited IO version. See Figure 2 for a block diagram. Figure 2 Block Diagram. The Unos digital IO 1. LED on board and also turns ON the external relay that controls AC power. I could have used a relay shield, but my philosophy is to use first what I already have on the shop, so I built one around an Omron 5. V relay and a 2. N2. KOhm base resistor see Figure 3. A 1. N4. 00. 1 diode protects the transistor from over voltage when the relay switches state. As an added convenience, the switch S allows the user to force the relay ON manual override or put it into normal AUTO mode, controlled by the Arduino. I recommend addin a fuse to the AC circuit for protection as shown in the figure. The AC adpater also connects downstream from the fuse so it is also protected. Figure 3 Relay Board Figure 4 Relay Board Photo. In keeping with my re use philosophy, I built my 7 segment display from individual segments I already owned Figure 5. Its a lot of soldering work and you may save yourself some work by buying a pre assembled module. These were common anode type displays, so I used 2. N3. 90. 5 PNP transistors for the multiplexing and as a consequence the Arduino outputs are active Low. This can easily be changed in the code in case of common cathode displays, NPN transistors and active High outputs. Google around for more info if you are not familiar with this driving arrangement. Series 1. 50. Ohm resistors in this case resistor array limits the IO current through the ATmega pins. Notice that I dont drive the decimal points in the segments so only 7 segment connections are needed plus 4 multiplexing enables. See Figure 5 and the circuit in Figure 6. Figure 5  Display Board Figure 6 Display Board Circuit. The time adjustment push buttons are connected to A0 and A1 inputs configured as digital Inputs and must include pull up resistors. Crack Para Simplecast 3.1.0 more. Figure 7 shows the simple circuit. Figure 7 Time adjustment push buttons. The RTC module connects through I2. C to the A4 and A5 Arduino IOs. Finally, the 5. V power supply Figure 8 is provided from a re purposed cell phone wall wart. This supply is rated at 5.