Table of Contents
The 555 timer integrated circuit makes for an easy high or low (on or off) output circuit.
Set with light dependent resistor (LDR):
For the demonstration circuit shown in the diagram…
- A bright enough light falling on the light dependent resistor (LDR) sets the output high.
- Pin 2 (trigger) requires a low input signal (1/3 supply voltage or less) to set the output high.
- Pressing the pushbutton switch sets the output to low if the output is high.
- Pin 4 (reset) needs an input signal close to the negative supply (low) to set the output low.
- Reset pin overpowers the trigger pin. If both of them have a low input. The reset pin will always hold the output low when it has a low input.
Assorted integrated circuits (ICs) kit. Included is the NE555 timers and other commonly known ICs. I have previously covered some of the other ICs in YouTube videos. It is an Affiliate link ad that supports this channel.
Video:
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