Hi there!, I want to make this project, but i'm noob in electronics , and i'm studying other area. (something with mechanics )
A three digit seven segment display, in which is shown a number entered by a numeric keyboard. It should can be reseted.
I've investigated it and at this moment I think it maybe will be something like this:
- Keyboard: with 12 buttons, 10 digits + reset and lamp test
- Decimal to binary converter: To pass from entered digit to a 4-bit word.
- One flip flop (I guess those is a memory), with a FIFO stack, in which the last entered digit "shifts" the last one, like in calculators.
- Three 4-bit to sevent segment display drivers.
- Three sevent segment displays (one digit each).
Keyboard => A/D converter => Flip Flop FIFO => Drivers => Display
This is a graphical representation of my idea:
**broken link removed**
I've developed the drivers -> display stage with Philips 4511 ICs (HEF4511BP) and KINGBRIGHT SC56-11HDB seven segment leds (common anode?) with a 150R Resistor in each line, I've seen there's not enought contrast in leds.
I tried to make the shift stage with 74ls164 ICs, but it was a great downfall! .
I hope you could help me in this project.
greetings to all!
(sorry for my Pre-historyc english, i hope in the future it will be better!)
A three digit seven segment display, in which is shown a number entered by a numeric keyboard. It should can be reseted.
I've investigated it and at this moment I think it maybe will be something like this:
- Keyboard: with 12 buttons, 10 digits + reset and lamp test
- Decimal to binary converter: To pass from entered digit to a 4-bit word.
- One flip flop (I guess those is a memory), with a FIFO stack, in which the last entered digit "shifts" the last one, like in calculators.
- Three 4-bit to sevent segment display drivers.
- Three sevent segment displays (one digit each).
Keyboard => A/D converter => Flip Flop FIFO => Drivers => Display
This is a graphical representation of my idea:
**broken link removed**
I've developed the drivers -> display stage with Philips 4511 ICs (HEF4511BP) and KINGBRIGHT SC56-11HDB seven segment leds (common anode?) with a 150R Resistor in each line, I've seen there's not enought contrast in leds.
I tried to make the shift stage with 74ls164 ICs, but it was a great downfall! .
I hope you could help me in this project.
greetings to all!
(sorry for my Pre-historyc english, i hope in the future it will be better!)