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Step 7Adding power and putting in some LEDs
Use a peg or something to hold the end of the wire from the phone charger without resistors on it to the shorter end of the cable on the board.
Plug the mobile phone charger in. Hold onto a bit of the cable that has solder on it that is attached to the charger by a peg and then use the back of a finger to touch the other wire from the charger. It really, really should not hurt you, but just in case there is something very wrong with your charger you will find out with the back of your hand and not end up gripping it and getting hurt.
Now get one of your LEDs and bend the legs out flat.
Touch the remaining mobile phone cable, the one with the resistors on it, onto the remaining cable on the board. The one without the peg on it. If it sparks or anything you have done something wrong and there is a short. If it does not spark, that does not mean there is no short though.
While the charger is connected to the board touch the LED with the bent legs two wires that go over the same row so that only one LED leg touches each wire. Each leg of the LED must only tough its own wire.
If it lights up, good. If it doesn't turn it around so that the legs touch the other wires instead. LEDs can tell if they are the right way round or not. I don't think it hurts them if they are the wrong way, they just don't light up.
Once it lights up, you know which way around it goes. Do not leave it on the board if it glows really bright and sort of a bit yellow looking. That will mean there is too much power. We will get to that.
Lay the LED on the table so you know which way around it goes. Which legs like which wires.
Do the same for 7 more LEDS so that you have four of each colour. 4 laid out on one side of the board and 4 on the other.
Plug the mobile phone charger in. Hold onto a bit of the cable that has solder on it that is attached to the charger by a peg and then use the back of a finger to touch the other wire from the charger. It really, really should not hurt you, but just in case there is something very wrong with your charger you will find out with the back of your hand and not end up gripping it and getting hurt.
Now get one of your LEDs and bend the legs out flat.
Touch the remaining mobile phone cable, the one with the resistors on it, onto the remaining cable on the board. The one without the peg on it. If it sparks or anything you have done something wrong and there is a short. If it does not spark, that does not mean there is no short though.
While the charger is connected to the board touch the LED with the bent legs two wires that go over the same row so that only one LED leg touches each wire. Each leg of the LED must only tough its own wire.
If it lights up, good. If it doesn't turn it around so that the legs touch the other wires instead. LEDs can tell if they are the right way round or not. I don't think it hurts them if they are the wrong way, they just don't light up.
Once it lights up, you know which way around it goes. Do not leave it on the board if it glows really bright and sort of a bit yellow looking. That will mean there is too much power. We will get to that.
Lay the LED on the table so you know which way around it goes. Which legs like which wires.
Do the same for 7 more LEDS so that you have four of each colour. 4 laid out on one side of the board and 4 on the other.
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