can some one give me diagram of how to connect -
arduino with transistor (TIP120) , battery , 7segment display (cathode)
note - just one segment will be enough for 7segment display - as i will use the diagram to connect other segment with TIP120 transistor
Hi,
Google;
uno tip120 7 segment display
Tom.. 
unable to find it , no information about connecting 7segment display (cathode) with transistors
what information do you need?
Welcome! Your pictorial is not easy to read, no pinout for the parts. Also why a TIP120 for a LED segment. I will take a SWAG and say A NPN transistor does not work very well as an emitter follower circuit (how your picture appears it is connected) to control a DC voltage. You want to use it as an open collector circuit. If you had drawn this in a schematic capture the error would be obvious. There are other problems as well, I hope you have lots of displays because without current limiting they will be fried.
I have some custom segment that require 0.5 A current ,so i am using TIP120.
I only wanted to know how to connect and control a cathode 7 segment display with a transistor(TIP120) or i just wanted to know how to get +ve charge from collector of the transistor. please help!
I gave you the answer. This may help: https://www.electronics-tutorials.ws/transistor/open-collector-outputs.html
I am a student i can't understand it ,please can you prove some diagram that will help me understand is better
connection between arduino transmitter and a 7-segment cahthode and battery
Do you mean transistor and not transmitter?
Do you mean voltage and not charge?
The TIP120 is a two transistor (Darlington pair) and is not suitable for what you want to do with it. this is the data sheet for the device:-
TIP120.pdf (534.6 KB)
It is against the forum rules to make duplicate posts, I have flagged the moderators about this.
Then why mark that post as a solution?
I think you would be better off posting a section that deals with a language closer to your own native language.
yes ,sorry my mistake as i joined yesturday and not know much about it.
but can you provide me how to connect
arduino with transistor ,battery,7segment display (cathode)-any one segment will be enough
What part of:-
Are you failing to understand?
can you suggest things that will help
@no-name868, do not cross-post. Threads merged.
can i give you tinkercad link?
But the current limiting resistors must be in the segments. I am assuming that each segment doesn't want 500mA.
Also note you can't get this much current from the 5V on the Arduino. So using a battery or external supply then you must connect the negitave side of the supply to the GND pin of the Arduino.
When you wrote the word yesturday did a row of red dots appear under the word? That tells you that you made a spelling mistake. Press the control key (ctrl) and left click, then a list of alternatively words will come up for you to chose the right one.
still not getting it,
can i share you my tinkercad link
No. I don't use it.
What part are you not getting?
