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September 6, 2014 -Kelli Wysoglad: Now the count up system can count up to 999 and the delay between the numbers is 300 ms. I think this is a good delay because we don't want it to go to fast because then people will miss the number. Then I transferred the circuit to a larger board and it does work except the bottom LED will not light. I tried checking the connections and something must be wrong but I do not know what. This would be between pin 1 on the display (line 4 on the board, left side) and pin 10 on the decoder (line 26 on the board, right side). Lou, can you take a look at it and see what is wrong?
August 30, 2014 -Kelli Wysoglad: The problem with the display is it is displaying only odds and displaying them twice in a row. For example, it displays 1, 1, 3, 3, 5, 5... We did a serial print function to test the code to make sure it is sending the right numbers and it is, except for multiples of 10. This problem could be related to hardware. If the least significant digit is not connected this would happen. If you could try and figure this out Rachel that would be awesome! Also just to note, digit1 is the least significant digit.
August 22, 2014 -Kelli Wysoglad: So here is the status of my part of the project. So far I have begun working on how to program the system to count up. I have started small and it is only supposed to cycle through digits 0-9. The code has yet to work; however, the only problems with it (without being able to test it) is just simple defining variable issues and most likely setup issues in the code. I plan to work on that next Saturday. Also, a push button needs to be added. There really isn't any room currently to put a push-button; therefore, Lou and I were discussing adding a shift register and believe that it would be a good idea. This would minimize the amount of pins used and would make the board less crowded. From what I have looked at, the shift register that we currently use is 74HC4511 which cannot multiplex. What we need, I believe, is a shift register that does. For this, we need a 74HC595. To sum up, the next steps would be to finish the code for counting up and then figure out how to cycle through numbers 0-99 and then 0-999; which will not be too difficult. Next, we have to add the shift register to make room for the push-button or figure something else out to make room for it. I think I can definitely have the most important part of the code, the count up system, ready in the next couple of weeks as long as inserting the shift register/push-button does cause issues.
August 9, 2014 -Kelli Wysoglad: Today Lou and I made a plan on exactly what functions the display needs to display. I determined the delay should be approximately 5 milliseconds. Additionally, I attempted to program the display to count up. The only codes I have been seeing are really long and just literally cycle through all the numbers. I am looking for a way to program functions so that the code is not as long. -Mode Plans: timer active, charging and show when fully charged. -Display Selection: battery percentage, time/minutes left, low battery (flash everything). Four LEDs to work with: 3 decimal LEDs for 1 wire. Need an additional wire for the 4th. Switches: up and down, cycle through display, power (obviously)= 3
July 30, 2014 -Kelli Wysoglad: The timer is now switching between programed numbers on each character. It runs through the numbers on a 50 millisecond delay. This delay will be adjusted to go faster. The next step is to figure out how to program the timer to count up.