I have gone through my many pages of notes and printed info from threads on this forum that have been offered for my project of a dark sensor circuit that will use a counter circuit to count the number of time the LDR's go dark.
Hopefully the scanned image I have attached will be clearer and provide for the ability for the correction of mistakes.
I have tried to combine all of the suggestions I have received and put everything together so I know if I have understood all of the info provided. I expect my remaining components to arrive tomorrow so I will be jumping in very soon.
I tried to copy the circuit Ron H. provided as an example when I asked about using all 4 comparators in the 339. I do have a question about the 4 outputs though. After he posted his circuit, I went to my proto board and jumped my 10K pot to a second comparator and added a second LDR/resistor combo for the second comparator. Because I didn't know any better, I just connected the outputs from the 2 comparators I had setup. I only used the 1 pull-up resistor and 1 resistor into the base of the 3906. It seemed to work great. I alternately covered both LDR's and each one, when covered separately, caused the buzzer to sound.
Obviously his suggestion and my attached circuit handles each output separate and they meet up "down the road". Will either way work? Or did I just get lucky in my setup?
The major assumption on my part is that I can just "swap" out the buzzer/LED portion of my proto with the 4553/4543 counter circuit. I would appreciate some feedback on what I have shown - how well did I combine the overload of info?
Thanks
Hopefully the scanned image I have attached will be clearer and provide for the ability for the correction of mistakes.
I have tried to combine all of the suggestions I have received and put everything together so I know if I have understood all of the info provided. I expect my remaining components to arrive tomorrow so I will be jumping in very soon.
I tried to copy the circuit Ron H. provided as an example when I asked about using all 4 comparators in the 339. I do have a question about the 4 outputs though. After he posted his circuit, I went to my proto board and jumped my 10K pot to a second comparator and added a second LDR/resistor combo for the second comparator. Because I didn't know any better, I just connected the outputs from the 2 comparators I had setup. I only used the 1 pull-up resistor and 1 resistor into the base of the 3906. It seemed to work great. I alternately covered both LDR's and each one, when covered separately, caused the buzzer to sound.
Obviously his suggestion and my attached circuit handles each output separate and they meet up "down the road". Will either way work? Or did I just get lucky in my setup?
The major assumption on my part is that I can just "swap" out the buzzer/LED portion of my proto with the 4553/4543 counter circuit. I would appreciate some feedback on what I have shown - how well did I combine the overload of info?
Thanks