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Summary
Summary
I designed a 555 timer circuit to power a series of LEDs using an Arduino as a voltage regulating source. The primary goals for this circuit were to create a design that both (a) produced a square wave output at about 500 Hz frequency, and (b) created a square wave at approximately 50% duty cycle. Rise time should be sufficiently fast (<100ns) and the circuit should be able to light up three LEDs bright enough to see clearly.
I designed a 555 timer circuit to power a series of LEDs using an Arduino as a voltage regulating source. The primary goals for this circuit were to create a design that both (a) produced a square wave output at about 500 Hz frequency, and (b) created a square wave at approximately 50% duty cycle. Rise time should be sufficiently fast (<100ns) and the circuit should be able to light up three LEDs bright enough to see clearly.
Primary Goals: Duty Cycle and Frequency
Primary Goals: Duty Cycle and Frequency
(Approximately 40% and 700Hz)
Secondary Goal: Rise Time
Secondary Goal: Rise Time
(About 47 nanoseconds)
Secondary Goal: Output Current >100mA
Secondary Goal: Output Current >100mA
(Slow rise chip can sink 200mA of current)
Takeaways
Takeaways
Learned tradeoffs to look for when selecting 555 timer chips to use in a circuit
In this case, higher output current was more important than rise time
Report
Report
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