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A PIR sensor module is used to shutdown the display when no one is in the room (this can be disabled to keep the display always on).
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I had a few problems getting the design in the correct format for their machine but in the end I sent it from Illustrator in eps format the very helpful people at Regal Signs scaled it down to the correct size for me. The module comes supplied with a Lithium-Ion rechargeable battery see diagram. I use a non rechargeable battery so have removed resistor R5 from the module as per photo10. Standard form is a way of writing a number so it is easier to read. It is often used for very large or very small numbers. Standard form is like scientific notation and is typically used in science and engineering. My case is 34mm deep and includes the rear dust seal 2mm, rear MDF board 14mm, front display board 14mm and 4mm float glass. Photo 5 The intersections of the grid will be the centre point for the 6mm LED mounting holes and the 18mm countersunk holes.
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The display driver boards for the MAX7219 I/C use modified LED matrix boards. These boards come complete with all components. 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 6 & 7 Using an automatic centre punch ( use a nail or screw if you don't have one) I punched the 256 intersection points of the grid.
Arduino Word Clock : 31 Steps (with Pictures) - Instructables Arduino Word Clock : 31 Steps (with Pictures) - Instructables
If like me you are not very good at coding just play around with the code to get an understanding of how it works. 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. Note that we do not remove the trailing 0 because it was originally to the right of the decimal and is therefore a
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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. Photo 1 shows how the Module is wired before modification. The modification is quite straight forward. First of all bend the following LED Matrix pins 90°, the top pins up and the bottom pins down.
The board is marked up to show the drilling position of in the centre of each display character. Using a 500mm display I measured my vinyl sheet and the characters are 25mm apart starting 62.5mm from the edges. I drew these lines on the MDF, the intersections being the drilling points. Memory The ATmega328 has 32 KB, (also with 2 KB used for the bootloader. The ATmega328 has 2 KB of SRAM and 1 KB of EEPROM. Input and Output Each of the 14 digital pins on the Nano can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions: Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the FTDI USB-to-TTL Serial chip.
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