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Thank you for your appreciated effort.
i test the following circuit on breadboard and i see it works fine.
the relay activated on a certain light intensity and off on another one.
when i change R2 to 1M i see the gap between relay on and off increased.
any modification needed ?
Note:
#I...
Re: Automatic light control circuit
I found the following circuit , could you advice to use it ?
I tested the circuit using simulator .
With pnp transistor not working,
When i used npn transistor bc548 it works when i increase the coil resistance of the relay from 240ohm to 480 ohm.
Re: Automatic light control circuit
I have cfl and led lamps :thinker:
And i want to control these lamps on and off only .
I dont need to control the light brightness :)
What is the purpose of 100uH ?should i use it ?
Re: [moved]how can i add a backup battery to keep my pic microcontroller project work
no i dont have car battery ^^
i dont know how to determine the batery type for my system ^^
and how to charge the battery and how to protect the battery from any thing may damage it ^^
Re: [moved]how can i add a backup battery to keep my pic microcontroller project work
thank you :)
I'm using pic16f877a with dht22,ds1307 module,ugn3013 hall effect switch and esp8266 ^,^
i want to keep all the circuit working if the main source goes down .
i'm using 9-12v ac-dc adapter ...
[moved]how can i add a backup battery to keep my pic microcontroller project working
Hi All,
i need to add a backup battery to keep my pic microcontroller working when the main source goes down .
how can i do that ?
Regards :wink:
thanks guys :)
I am a power system student and i don't have enough experience in logic and electronics circuit :(
this project for instrumentation lab :)
is there any reference or book may be useful ?
regards :)
Hi,
I want to design a circuit for measuring a speed of an object .
My approach is to use two IR sensors and the distance between them is fixed .
once the object passes the first sensor the time starts counting and when it passes the second sensor the time stops counting, the speed measured by...
Hi friends,
I am trying to use fprintf to print the data on my own stream like LCD using xc8 compiler.
so.is there any example to do that ?
thanks in advance ;-)
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