Elektronika Kifo
elektronika kifo
hrvatski jezik

Unusual clock with AT89C2051


Why unusual clock?

Strangeness of this clock is in its expression of numbers, which is realized using seven Leds. Leds are located inside a pipe, one above another and if we move Leds enough fast left or right, we have a space where we can write numbers, characters or anything else.

All these are possible only if we turn on specific Leds at precision timing.

Sat AT89C2051
Moving LEDs left or right is achieved using a steel plate, so we have to tense the pipe in one direction (left or right) and let pipe to vibrate by itself.
Sat AT89C2051
That “virtual display” has resolution of 30*7 dots or five characters (5*7 with one empty column).
 
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last upload
12.09.2004.

Elektronika Kifo

Instructions

To make this device you will need:

  1. A piece of metal board (I used al-board 150mm*20mm)
  2. Al-pipe in which are located LEDs (fi 10mm *145mm), it can be of any material, but must be light and firm.
  3. Plate steel 65mm*15mm*0.35mm
 
Piezo

On al-pipe you must drill 7 holes, where you will place 7 Leds. LEDs are connected with thin copper wire to circuit board. You must have more patience cutting “piezo” to about 4mm and soldering it or glue it to steel plate. “Piezo” is significant piece in this device, as it is used for triggering and helps us to know the position of Leds.

“Piezo” is a piezoelectric element and you can find it in clocks, buzzers…

 


Elektronika Kifo

Time adjusting

Setting time is not a complicated process, with key “Time” and “Hour” you can change hours and with “Time” and “Min” – minutes. The same thing applies also in alarm setting. Time and alarm setting is possible only when the pipe vibrates with your help. When the pipe be still, you can’t change time or alarm.

When time is identical to alarm setting you will see one neat effect with LEDs.

 


Elektronika Kifo

components:
schematic of clock
Shema sat AT89C2051
part component
stock
IC1
IC2
R1, R2
R3
R4, R5
R6
R7
R8
R9–R15
C1
C2
C3, C4
Xtal
Led
Piezo
Tipka
LM324
AT89C2051
5K6
100K
1M
3K9
33K
2K2
120ohma
22nF
1uF
33 pF
12Mhz quartz
3 mm

1
1
2
1
2
1
1
1
7
1
1
2
1
7
1
4


mechanical parts:

A piece of metal board
( 150 * 20 mm )
Plate steel
( 65 * 15*0.35 mm)
Al-pipe
(o 10* 145 mm)

 

Elektronika Kifo

You can download the hex file here:
program SatAT89C2051 - hex file
program SatAT89C2051 - bin file
You can download the circuit and PCB here:
sch, pcb - SatAT89C2051 - in Protel 99 SE
  SatAT89C2051.pdf - circuit in pdf format

 

If you have any difficulty in making this device, feel free to mail me.

 

sat

More information about unusual clock with AT89C2051 you can find in magazine
"Svijet elektronike"
, nr.
46 (June / July 2004) Author: Ivica Novakovic
with pictures, schematic and with hex file for Atmel micro controller.

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Elektronika Kifo

If you use the software, hardware or informations from these pages, you do it at your own risk. All projects are copyrighted and you shall not in any manner distribute, use or make copies of, or otherwise duplicate any materials and projects contained on the Website, without permission of author

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