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Results tagged with 7segmentdisplay
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user 303651
A numeric display consisting of seven segments per digit, allowing characters 0 to 9 to be displayed by selecting which segment is on or off. Can have each digit independently controlled, or can be multiplexed to reduce pin count. An 8th segment can be included for a decimal point.
3
votes
How to add multiplexer to my circuit to drive 7 segment display every 10 seconds from 2 diff...
It's pretty simple, you have a two digit counter, each digit outputs 4 bits, those 4 bits go to a decoder/driver/display. You have a temperature represented by two 4 bit digits that get sent to the sa …
- 27.8k
3
votes
Turning on an alarm after counter reaches 99
The instructions say that the alarm should sound when maximum occupancy is exceeded, not when it reaches maximum. So you would need it to sound when the 100th person is added. If you use a counter IC …
- 27.8k
1
vote
Undesirable dim light of LEDs on 7 segment display
It sounds like the driver transistors are not turning off all the way.
On the 5th page of the data sheet it shows connections for common cathode displays using emitter followers to drive the segments, …
- 27.8k
1
vote
Why does adding this capacitor cause other segments to come on when they should not?
What is probably happening is that the capacitor is allowing leakage on the cathode of digit 4 so the segments that are supposed to be on for the other digits are showing up on 4 as well.
You don’t wa …
- 27.8k
5
votes
How can I use a transistor to control the segments on this 7-segment display?
If you don't need to use the decimal points you might consider using something like a CD4511B BCD to 7 Segment Latch/Decoder/Driver.
This is designed specifically to drive common cathode LED displays. …
- 27.8k
1
vote
0 to 999 Hz frequency counter
It sounds like a timing problem with the latch and reset signals.
Years ago there was an article in Popular Electronics (Feb. 1980) about CMOS counter ICs that had a simple latch/reset circuit using a …
- 27.8k
12
votes
Accepted
How do we control a 7-segment display with a rotary switch to ground and 12v supply?
There’s a less complicated way to do this. Since you only have six positions you could use a diode matrix.
Each segment is connected to the switch through diodes so that in position 1 the cathodes for …
- 27.8k