Rounding out the parts list is a small CdS photocell to detect light levels, a DIP switch for configuring clock options, two push buttons to set the time, a CR2032 battery holder, and 5V regulated wall wart. This makes the MAX7219 (or 7221) drivers a natural choice. I wanted to be able to dim the LEDs to match the light level in the room. They are small surface-mount LEDs that can handle 30 mA of peak current. For white light backlighting of each word, I'm using Digikey 1080-1212-1 LEDs.
#WRITTEN WORD CLOCK SERIAL#
I wanted high accuracy, a serial interface, and battery backup. I am very familiar Micrchip's PIC family, so I selected the PIC16F688. The next thing to do was choose the microprocessor, the clock IC, and how do you drive all of those LEDs anyway? Printing this part at the "standard" resolution takes just over six hours. STL files), and then assign the Right print head to the other portion. Using the Makerbot software, you assign the Left head to one portion (one of the. STL files in the Makerware software, and then "add" the second.
To prepare for printing the two-color item, you start by opening one of the. STL file, and then select the other portion and create the second. The Autodesk software helps with this - you select one portion of the model (parts that will print in one of the colors) and create one.
STL files, one for each color (one file for each print head on the 3D printer). One thing to know is that you have to create two separate. I printed the part using a Makerbot Replicator 2X (two heads) 3D printer. Printing a two-color item in a single print pass has just a few more steps than usual.
I created the 3D CAD file (model) using Autodesk 123D Design, which is free, and is easy to use for creating items like this.
0 kommentar(er)
