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Move the decimal point in your number until there is only one non-zero digit to the left of the decimal point. The resulting decimal number is You will need to take some time to learn how to use " if, else, else if". There are plenty of turorials out there. I find video tutorials very helpful. Photo 4 Side view showing the pins soldered to the side of the old LED Matrix connector pins just above the PCB. Photo 3 To test your word layouts print out a miniature version of your word display 62mm x 62mm on plain white paper. The module comes with a 10K resistor preinstalled but this can be removed and a resister to match your LEDs current added in it's place. My LEDs Forward Voltage is 3.2v - 3.8v @ 20mA. They can handle 30mA max but for long LED life 20mA is best. I have used 22KΩ resistors which will limit the current to around 20mA when the light levels are at their peek.

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Note this temporary modification is only required if you want to test your code on the DOT matrix displays supplied with the MAX7219 modules.Inkscape is professional quality vector graphics software which runs on Windows, Mac OS X and GNU/Linux. It is used by design professionals and hobbyists worldwide for creating a wide variety of graphics such as illustrations, icons, logos, diagrams, maps and web graphics.

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SMD is easy and fast , just a small amount of solder paste a cross the pads and heat it up with a reflow heater. Photo 6 The Matrix grids are wired to the corresponding pins on the MAX7219 modules according to the layout table below. Photo 8 Using a drill bit to suite your LEDs (6mm in my case) and using the punched holes as a guide for the drill bit drill out all 256 LED mounting holes.

b is an integer and is the power of 10 required so that the product of the multiplication in standard form equals the original number The deepest PCB including components are the MAX 7219 modules that are 10mm deep. On completion the rear board is glued or screwed to the front board. Photo 6 The Anode BUS Bars are shown below in Red and are supported off each LED Anode about 2mm off the MDF board. If you are keeping my linear seconds display update the version number on the display so you know what version you are trying out each time. This is done in the module credit.h around line 47.

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Mount the Glass front display panel using the Chicago bolts also fixing the touch sensors at the same time.Photo 11 The board is then rubbed down and primed using MDF primer and painted white so the countersunk holes reflect the light from the LEDs.