Instead of referencing each number individually, a better method to display numbers on a 7-segment display is to store each binary value in an array and then reference them later in the code. Want to learn more? Visit the Wikipedia article about 7-segment display character representations at. Alternatively, letters like “w” or “k” require a bit more imagination to represent using only a single 7-segment LED often it takes LEDs with more segments or two, side-by-side devices to accurately display them. The capital letter “A”, for example, is easy to display using 0b11110101 as one of your outputs’ binary representations in SimpleIDE (try it!). Although every letter of the English alphabet can be represented (in capital and/or lowercase form) using a single device, some letters are a bit more difficult to display in an easily recognizable way. You may already have seen examples of this on CD/DVD players, calculators, or microwaves. Set_outputs(15, 8, 0b11100111) // 0 -> 7-segment displayħ-segment LEDs can also be used to display letters. #include "simpletools.h" // Include simpletools Referring to the diagram below, you’ll see that together, segments B and C make up the number 1.ĭisplay digits on a 7-segment (common cathode) LED display. If you look at the schematic, you’ll notice that pin 15 is connected to segment B and pin 10 is connected to segment C. So the binary representation for the number 1 sets pins 15 and 10 to high. If you investigate more closely, you’ll notice the binary digits correspond to I/O pins, in reverse order, from 15 to 8. The number 1, for example, is represented as 0b10000100. If you look through the rest of the code, you can see that each digit has its own binary representation. Verify that the display counts from 0 to 9.įirst, the code sets all the pins between 8 and 15 to outputs with set_directions(15, 8, 0b11111111). Next, the code outputs a 0 with the command set_outputs(15, 8, 0b11100111).Set the power switch to position 1 (if applicable for your board).Open the Seven Segment project from Documents\SimpleIDE\Learn\Examples\Circuits.If you haven't already installed the latest USB driver, SimpleIDE, or Learn folder, go to Propeller C - Set up SimpleIDE and Propeller C - Start Simple. The test code will count from 0 to 9 on the display, with half a second between each digit. You will need to adjust your pin assignments in the code if using the FLiP. Note: The FLiP wiring diagram uses pins 6-13, not pins 8-15. Build the circuit for the FLiP using the diagram below:.Build the circuit for Activity Board using the diagram/schematic below (the images show 100 ohm resistors, but use 1k ohm resistors instead):.Or, you can substitute 220 Ω resistors (red-red-brown) if necessary. It’s best to use resistors of the same value so all the segments light up evenly. Any resistor value between 100 Ω and 1 kΩ will work for the LED resistor and the lower the resistance, the brighter the segment. When each I/O pin is set to high (outputs 3.3 V), the LED it is connected to lights up. This tutorial will show you exactly how to control the display, and use it to count.Įach individual LED in the 7-segment display needs a resistor between it and the Propeller’s I/O pin. This display uses seven LEDs arranged in a special pattern that makes it possible to show any number from 0 to 9. You can find these in many products that need to display numbers in a simple way, like clocks, kitchen appliances, or digital scales. A 7-segment display is a great way to display numbers using your Propeller.
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