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Initial work on the design -- it's all in the patterns of "on" and "off" sectors on the disks. As the wheels mesh together, different sectors are revealed through the 7 segment windows.
The three segment disks are at the top, using different shades for the different segments to make verification a little easier. Along the bottom I'm testing '0'... '4'.
Remember these stupid displays? White box PCs used to have a slow/fast speed switch (mainly for game comaptibility). That evolved into these ridiculous numerical displays that would read for example 100 or 66mhz. The problem was when you asseembled a PC you had to set all these jumpers on the back to get the right numbers set for the high/low speeds. I wasted many an hour doing that while assembling computers in my college job at Computer House.
This 7-Segment PIC Microcontroller Digital Clock is controlled by PIC16F627A. More detail check out picnote.blogspot.com
This 7-Segment Digital Clock is controlled by PIC16F627A. More detail check out picnote.blogspot.com
A 4 digit 7 segment red LED display from an old clock. I removed the connection wires and added the header.
Project at www.usbmicro.com
Arduino controlling 2 x 7-Segment LED Displays directly without the aid of an LED driver IC. It creates a rats nest of wires.
First goal reached. Cycling through temperatures and turning on LEDs indicating what is showing.
No LEDs is current temperature. Green is highest recorded, red is lowest recorded (the red is oddly dimmer then the green, I'll have to figure that out).
Just to show that I did some code that counts all the way up to 99, and resets. Didn't bother filming it all, but you get the idea.
My employer, the Experimental Aircraft Association, has a model of a centrifuge used for testing astronauts. The old sensor and LED display failed earlier this year, and instead of going back to the company that originally built it, I was given the chance to make a new one.
The design is pretty simple - in the base of the centrifuge, an H21B2 photointerruptor is connected to an Arduino to measure RPMs. That number is then sent to a second Arduino (connected via I2C) in the display itself. The second Arduino calculates Gs (based on the speed and the radius of the centrifuge) and drives the 2.3" 7-segment LCDs (using Allegro A6278EA-T ICs).
Yeah, it's not the prettiest or cleanest job, but it works, and I was able to reuse some of the old parts...
The connections are as follows:
Pins left to right (1 to 14)
1 - Digit 3
2 - Segment a
3 - Digit 2
4 - Digit 1
5 - Segment e
6 -
7 - Segment d
8 -
9 - DP
10 - Segment c
11 - Digit 4
12 - Segment g
13 - Segment f
14 - Segment b
Project at www.usbmicro.com
Fluorescenčný 7-segmentový 12-miestny VFD displej Futaba pre kalkulátory,pokladne, váhy, počítadlá a pod.
VFD svieti veľmi príjemnouzeleno-modrou (tyrkysovou) farbou.
Výborná viditeľnosť za zhoršenýchsvetelných podmienok predurčuje tieto displeje pre domáce interiérovézariadenia ako napríklad hodiny, budíky a pod.
* Typ: 13-MT-13G
* Farba:zeleno-modrá (tyrkysová)
* Výrobca: Futaba, Japan
* Symboly:
* 12 miestčíslice (7 segmentov) s desatinnou bodkou/čiarkou-/apostrofom
* –znamienko
* M
* šipka vľavo
* Vhodný pre:
* domáce projekty (hodinys teplomerom/dá-tumom a pod.)
* opravy
The shield populated with display, buttons and a piezo speaker. The DS1307 RTC is at the end of the ribbon cable.