captainkirksdog
Member
Hello,
My mom is 81 years old and she likes her flower garden but she very often leaves the water running way too long. I built a 5-30 minute timer (555), but she says she wants to be able to see how much time is left. So here's the First Stupid Question of the Year: How can I put a, let's say, four digit (minutes, seconds) readout on my timer? I'm guessing I'll have to start all over with a digital timer so, PLEASE, no code and no processors. I don't understand any of that stuff. But I do have boxes full of TTL/CMOS stuff from way back. (Do chips "dry out" or get old sitting in the box?) Oh yeah, one other thing; I need it to have a selectable time interval (6). A six-position rotary switch (my mom won't ever use a keypad) and it counts down from whatever setting she chooses. Set it for 15, it shows 15, and CDs from there.
I'm looking for circuits that I can fit together; the timer section, the display, the selector section, etc. Can someone show me where to look? I've tried so many websites for timers but a lot of them are all about the Arduino chip. I am NOT interested. So, with that restriction in mind, can anyone help?
Thank you for your time. <ckd>
My mom is 81 years old and she likes her flower garden but she very often leaves the water running way too long. I built a 5-30 minute timer (555), but she says she wants to be able to see how much time is left. So here's the First Stupid Question of the Year: How can I put a, let's say, four digit (minutes, seconds) readout on my timer? I'm guessing I'll have to start all over with a digital timer so, PLEASE, no code and no processors. I don't understand any of that stuff. But I do have boxes full of TTL/CMOS stuff from way back. (Do chips "dry out" or get old sitting in the box?) Oh yeah, one other thing; I need it to have a selectable time interval (6). A six-position rotary switch (my mom won't ever use a keypad) and it counts down from whatever setting she chooses. Set it for 15, it shows 15, and CDs from there.
I'm looking for circuits that I can fit together; the timer section, the display, the selector section, etc. Can someone show me where to look? I've tried so many websites for timers but a lot of them are all about the Arduino chip. I am NOT interested. So, with that restriction in mind, can anyone help?
Thank you for your time. <ckd>