- #1
chrisalviola
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I can perform counting 0-99 but how do you stop it in 59 then 00 then back to 01?
heres a sample
heres a sample
How to use 555,2x 7490,2x 7447 to count 0 - 60?
- Thread starter chrisalviola
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SUMMARY
The discussion focuses on using two 555 timers, two 7490 decade counters, and two 7447 BCD to 7-segment display drivers to create a counting mechanism that resets after reaching 59. Participants suggest implementing a state machine or writing a microcontroller code to achieve this functionality. Additionally, the use of a Real-Time Clock (RTC) module is recommended for timekeeping applications, with specific mention of a 32.768 kHz crystal for accurate timing.
PREREQUISITES- Understanding of 555 timer functionality
- Knowledge of 7490 decade counter operation
- Familiarity with 7447 BCD to 7-segment display interfacing
- Basic programming skills for microcontroller coding
- Research state machine design for digital circuits
- Learn about programming microcontrollers for BCD output
- Explore RTC modules and their integration in electronic projects
- Investigate the use of 32.768 kHz crystals in timing applications
Electronics enthusiasts, hobbyists building digital counters, and engineers designing timekeeping devices will benefit from this discussion.
- #2
- #3
MATLABdude
Science Advisor
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You'd have to build yourself a different state machine that could do that. Or, being a CS type, you'd write a dozen lines of code for a microcontroller, providing BCD output to your 7-segment display drivers.
On the assumption that you're looking for some kind of time-keeping device, you can also use an RTC (real time clock). Some even come integrated with crystals (or if not, you can find yourself a 32.768 kHz--2^15 Hz crystal). Heck, I've seen one which was basically an alarm clock on a chip (think it came from Maxim).
On the assumption that you're looking for some kind of time-keeping device, you can also use an RTC (real time clock). Some even come integrated with crystals (or if not, you can find yourself a 32.768 kHz--2^15 Hz crystal). Heck, I've seen one which was basically an alarm clock on a chip (think it came from Maxim).