Eshal
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Personally, I would forget those diagrams as they are not directly relevant to street lighting.
Hi Princess,
Its alright, no one gets everything the first time. Lets make it simple.
As you may have seen in the schematics, there are three LM339 Comparator IC's. Lets name them:
1. Let the name of the one connected with Solar Cell be LM339-Solar.
2. Let the name of the one connected with Battery be LM339-Battery.
3. Let the name of the one connected with microcontroller be LM339-Micro.
You may have also seen in the LM339 datasheet that each IC is made up of Four comparators each with 2 inputs and 1 output.
It is a 14-pin comparator IC,
1. Pin 12 - ground
2. Pin 3 - Vcc
3. Pin 1,2,13,and 14 - outputs
4. Pin 4 to 11 - inputs
Now look at the schematics carefully -
In LM339-Solar, All output pins are connected to LEDs (These LEDs indicate the intensity of ambient light on Solar Cell), input pins 5,7,9,11 are connected a resistor network and input pins 4,6,8,10 are connected to a Solar cell via 4.7k pot and resistors.
In LM339-Battery, All output pins are connected to LEDs(These LEDs indicate the remaining battery charge levels), input pins 5,7,9,11 are connected to a resistor network and input pins 4,6,8,10 are connected to a battery via 4.7k pot and resistors.
In LM339-Micro, See the schematics very carefully and notice the connections of all the pins, its easy to identify everything well. All output pins are connected to microcontroller, out of its Four comparators, the inputs of three are connected to IR led and receiver diode pair (refer the schematics carefully for proper connection) and the input of fourth comparator is connected to an LDR.
I hope this will sort out all your queries.
All the best.
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