hey guys! I have never used the forum before and I want to know what I should make with the stuff I have. I have very few things and have no idea what I am doing. I have a Uno r3, a door lock soliniod, some fingerprint sensors, some buttons, a pentotometer, wires, and basic stuff like that! my brother is willing to let me use his Arduino giga to if I need it! he told me to come here and ask for ideas!
Make a code breaker game. The solenoid can be used to lock a safe and if the player guesses correctly, the safe unlocks. The fingerprint sensor can be used to override the code and unlock the safe. The Potentiometer can be used to adjust a timer before an alarm is sound. Gives you a sense of urgency or in this case your games difficulty setting.
ooo.. good idea!
Remember, though - your Arduino must not be used to power the solenoid; for that, you'll need either a MOSFET or relay to switch the current to the relay, and an external power supply to power it. Do some looking on the web, come back if you can't figure it out, BEFORE you wire anything up.
why not? i've done it before and it works. its rated for 5-6V
I have like 20 relays I bought in an online sale! LOL
My brother want to know if I can just use a Digital pin.
I don't know what a Digital pin is but he wants to know why I cant use that.
There is more to electricity than just voltage. There is also current. How much current can an Arduino pin source? How much current does it take to drive your relay?
You should start with a clock. That will keep you busy for a while. Then add stop watch capabilities. Then alarms. You want a nice interface too. You could mount the selonoid under your pillow when the alarm goes off the gently "nudge" you awake. Of course the alarm should be tweeting birds on a gentle spring morning.
In their excitement newbies sometimes bite off more than they can chew. So start simple and build off it. Much better than getting frustrated.
Sorry for my statement, I would start learning Ohm´s law then what a microprocessor does and finally what a digital Pin is. Doing all this a whole lot of ideas will fall from heaven 
Fascinating! Please explain... does it have 5 pins? Is it like an iambic pentameter?
So there is a difference between triggering a relay and powering a relay.
A normal relay, consists of a large coil and a bolt to connect contacts. This coil requires a lot of current to engage, more than any Arduino or Raspberry Pi or whichever microcontroller can supply. Which is why there is circuitry on that relay board that handles the power requirements for those relays. All you need to do is supply a trigger voltage of 5 volts from the microcontroller.
The digital pin on an Arduino should be able to trigger the relay by itself but if you are designing the circuitry yourself (which you're not in this case), you may want to add a buffer that can boost the arduino's output to a solid/stable 5v.
Update: I just realized you are not the guy who was talking about a relay board... but still a solenoid is no difference. However, now you will need to add the circuitry yourself, which means you will need a mosfet to drive the solenoid (there are plenty example circuits for powering solenoids online) and you may also need to add a buffer circuit too. Not to mention an adequate power source for the solenoid.
@mikeybropro123
@mikeybropro - How many accounts do you have, asking the same question?
If you are Dan, the 14-year old brother of Mikey (the electrical engineer), then you did use your brother's account to post on the forum just last week...
Or is there a third brother now?
my brother let me create this account after what he calls "the incident" yes my name is dan, I just went with the name my brother was using so you guys would know who I am!
yes I did post but this is the first time I have "used the forum by myself not on my brothers PC".
he helped me make my other post. so this is really the first time I have really "Used" the forum.
It is very clear that the both are the same person
Well, now that that is straight as a noodle... I have an idea:
Why don't "you" and "your brother" stop telling easy-to-crack, unbelievable stories? How can anyone believe either of you when you ask for help? Further, why did neither of you take any of the advice from anyone? Expecting people to believe your stories is insulting.
Start over. Read all the responses to your question. Follow-through as far as you can get. Return for more help.