12/13/2023 0 Comments Cathode led segment fading out![]() ![]() Note that the display arduino is on the right half of the board.Ĭarefully (the displays fall out easily), flip the board. Make sure the decimal point is facing down. These have been pre-tested in a bread board to make sure all the segments work. Next, continue soldering the rest of the pins.Ĭontinue by soldering the rest of the pins. Start by soldering the four corners of the headers, make sure everything is fully inserted. I like this Alpha Pure Core Water Soluble Flux Solder, makes the boards easier to clean at the end of assembly. The display Arduino has the short side of the pins inserted on the board and the master Arduino goes into headers. Insert the Arduino headers long end first into the female headers.Īnd here we are mocking how the Arduinos go on the tile. This Arduino Nano will become the master. ![]() If building a master tile, prepare two 15 pin female headers. We don't want pins sticking out of the front.Īnd now is a good time to start heating the soldering iron. The 6 pin connector can be ignored.įlip the board and insert the headers short pins first. Unpack an Arduino Nano, two if building a master tile. The red soldermask is really, really shiny and hides the tracks. It has a few silkscreen markings, but those will almost disappear once assembled. In order to keep the front of the board clean, it is important to put on the order a note: "do not add order number to board" PCBWay has been good about doing this. Those vias will be hidden under the displays when this is assembled. Some work went into making sure the front was clean of marks, the only clue that this is oriented the right way is that the vias on the lower part. Shown also are the steps that need to be taken once to make a master tile with two Arduino Nanos. ![]() The following pictures show the assembly process for a one Arduino Nano slave tile. Pictures of the front and back of the assembled object Arduino Enigma.Parts have been ordered to test this technique. To keep the square form factor, lets do 4x4, using 8 common anode and 8 common cathode displays. Using this technique a tile can go from 9 digits to 18. Lastly, put the selection line in input (high impedance) and move to the next pair of digits. Then put another pattern using 0 for the segments that will illuminate and put 1 on the selection line for that pair of digits. To illuminate one digit, put the pattern on the segment lines, using 1 for the segments that will illuminate, then put 0 on the selection line for a pair of digits. each of the select lines goes to the common anode of one display and the common cathode of another display. On the 8 pins used for the segments, connect 9 common anode displays and 9 common cathode displays. 9 select lines connect each of the common pins back to the Arduino. 8 pins on the Arduino connect to the segment pins on the seven segment display. The capacity is instantly doubled to 18 or 20 digits maximum. The key is to put a common anode seven segment display in parallel with each common cathode existing display. I have found a way to add more digits to this installation. Here it is running a falling digits animation: The rest of the tiles only have one Arduino The first tile in the series has two Arduino Nanos soldered, the first one runs the high level animation sketch and sends the commands to light up the LEDs to the display Arduino. The only way to get decent brightness out of them was to eliminate the current limiting resistors altogether and instead control the current via the duty cycle. The idea for the software current limiting came from using a Bubble LED displays on the Sinclair Scientific Calculator. When powered with a wall adapter, it is quite bright. Each digit is turned on for up to 255 uS and then the next digit is turned on. ![]() Development is done in a Sinclair Scientific Calculator and the sketch is uploaded to the tiles once it is working properly. The Arduino in each tile is also responsible for receiving commands from the previous tile and relaying commands to the next tile.Ĭurrent limiting is done in software, to keep things simple, there are no resistors on the boards. In this project we only drive 9 and keep D13 with its built in LED and the serial port pins free. In this board we can fit 9 (0.56") seven segment displays.Īn Arduino Nano can directly drive up to 12 seven segment displays in a multiplexed arrangement. This project starts with a board size that can be manufactured cheaply (100mm x 100mm). The idea here was to make a large animated seven segment display the simplest way possible, its just a board with an Arduino Nano, some seven segment displays and two headers. ![]()
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