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I needed help on using ULN2803. Like i wanted to drive some relays using uln2803. So how should i configure the uln.
The condition is i want to ouput 12 from ULN2803. I have provided ground to 9th pin and 12vcc to 10th pin. Now if i provide ground from microcontroller circuit. to input pins (i...
Hey everyone, i am not able to get a simple thing here.
I am trying to drive a relay by atmega32 using a BC 547 transistor.
my connections as of now are :
Relay Pin 1 (Coil) <------- +12v
Relay Pin 2 (Coil) ------> Collector (BC547)
From microcontroller -----> Base (BC547)(with 1k...
I was working on a home automation project. I was wondering if relays are the only option to switch AC appliances like light bulb, fan through a microcontroller.
I also heard about triads, solid state relays. can they be used instead of relays. The relays which i have chosen now are of 12v...
I was working on a project and we needed a circuit very similar to "avrnet". So thought will try to replicate the avrnet first and then make some changes to it.
Here's the link to this "avrnet" project :
https://www.avrportal.com/?page=avrnet
So we made the PCB and assembled all the...
hey thanks sagar_satish.
I would like to give more details. What i am trying to do here is to detect whether an AC appliance is ON or not. ? like a light bulb or something.
So i would want to detect the presence of AC current in the wire from switch to the bulb.? which is the ideal solution to...
But what we need is a DC input to the microcontroller (atmega32 in our case). So what we were thinking is about step down tranformer, a rectifier, and a regulator.
I dont know much about the "opto-isolated zero-cross detector".
So which would be the better solution.?
I am trying to detect AC voltage (ie 220v, 50hz) and take the input to the atmega32.
Like, to detect whether an AC appliance is ON or not.. ?
So what would be the ideal circuit to do this.
Am a computer science guy and havent got expertise in electronics.. so please do suggest an idea...
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