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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.
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
The shield populated with display, buttons and a piezo speaker. The DS1307 RTC is at the end of the ribbon cable.
Thermocouple is connected to 741 op-amp on this daughterboard via the blue and white wires at left. Date code on the ML741CS is 7419, week 19 of 1974. Other chips in the instrument are coded 1975 and 1976.
The unusual 'ML' prefix on the chip leads me to the supplier, Microsystems International:
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
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-BT-04A
* Farba:zeleno-modrá (tyrkysová)
* Výrobca: Futaba, Japan
* Symboly:
* 12 miestčíslice (7 segmentov) s desatinnou bodkou/apostrofom
* – znamienko napravej strane
* I
* E
* Vhodný pre:
* domáce projekty (hodinys teplomerom/dá-tumom a pod.)
* opravy