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Here is the outline,
I want to have a menu system accessible by buttons on my project. The display will be a 20x4 LCD Display and there will be 6 buttons as follows:
- UP
- DOWN
- LEFT
- RIGHT
- OK
- CANCEL
Now the basic idea of how these would work is have an interrupt port setup for each button (but thats 6 ports!). So now the question,
How could i achieve this, but only use the minimal number of ports?
I though about using a PISO Shift Reg, but then remembered it would need a clock etc and someway for the ND to know that data is coming in (i think).
I then there is the Matrix style setup but i would only save 1 pin (2 cols and 3 rows = 5 lines).
Any suggestions, fancy IC's or fancy components that will let be achive this goal?
Thanks for your continued support.
Stuart
OK, so i have finally given up on my very very cheap apparently "temperature controlled" soldering iron (its either too hot or too cold)
So, as the title of this thread suggests, i am looking for a new one but on a budget.
Im not looking to spend more than £100 (may be less) but want a decent solding iron with a digital display of some sort to show the current temperature...
So for you standard hobbyist who will be soldering through-hole components on to vero-board such as transistors, resistors etc (none of the surface monut stuff)
What would you guys suggest? What wattage is good? if 70W too low?
Etc etc etc....
Thanks guys.
