For the next clock I needed another kind of tube, a tube to separate hour and minutes.
I found the IV25 tube, a dot matrix tube with 7 dots. I ordered the tubes in ukraine. Some days later I got 6 of them. Nice.
If you order this tubes in ukraine too, don’t wonder, that you will get two types. One is labeled with IV25, the other one is labeled with IVLM 1-1/7. They are equal.
The Filament voltage is between 2.04 and 2.76 V. The Filament current is 30 .. 40 mA.
The segment (dot) voltage should be between 10 and 20V. The segment current is 10 mA.
Difficult is to describe the location of the Filament pins. This are pin 1 and 6.
This is pin 1. And now, count clockwise. I mark pin 6 with an connector.
… or how I can use the Arduino as ISP!
There are a lot of tutorials with removing the original chip from the board. I will show you an solution without removing!
The new tutorial is online (you will find this here: Project Link)
Sometimes you need a little time to search for a better solution. I changed the power supply. And now, we need only 5V voltage as input voltage, no 12V voltage are necessary.
It’s possible to operate the DC-to-DC step up converter with 5V voltage as input voltage too. ***smile***
This is the result … This is the result … with a provisional box.
The IV-18 Project is actually finished. The only thing that is not so nice, I use an Arduino Nano for control. For a long time I bought some Atmega168 microcontroller to programming this and to use it instead of the Arduino Nano.
Yesterday it was now ready, I dealt with the programming of Atmega168 via Arduino UNO. It was tearing the hair. I found a lot of pages in the internet (sometimes I have more than 20 pages open at the same time). But I got still errors.
In the evening it was time to say: Goal reached!
Now, I’m able to programming my own Atmega168 microcontroller and use it in my circuits.
In the next days I will share my knowledge and I will create a new page with all the necessary informations.
The little one gets eyes!!
Hi guys, I finished the tutorial about the clock!
9.1 The clock with 6x 7-segment display
Ok, now it’s finished: I present you “the clock”!
I control four 7-segment displays without any integrated circuit! The magic word is: multiplexing!
See here: http://youtu.be/6rp8Z3gxCBQ
I will write the tutorial in the next few days…
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