Step 1: What you will need
- Instructables' robot t-shirt (you can win one, or buy one here)
- Felt: red and white for the heart and another piece for the circuit panel
- Matching thread
- Pins, needles and scissors
- Needle nose pliers
- Washable fabric glue
- Conductive thread (I bought mine here)
- LEDs for the eyes (I used some yellow ones which I got from cheap set of battery powered Christmas lights)
- Two push button switches
- Resistor (use this site to determine which one you need)
- Button cell battery
- Flashing red LED circuit ( this I got from cheap flashing dollar store toy or you can make one)
Step 2: Prepare T-shirt: Eyes
Step 3: Prepare T-shirt: Heart
Step 4: Prepare T-shirt: Heart continued
Cut a small heart from red felt slightly smaller than the opening you made in step 3. Cut a square piece of white felt about 0.5cm larger (on each side) than the opening in step 3.
Using washable fabric glue, glue the heart onto the centre of the white felt and glue the white felt onto the t-shirt (gluing it on the inside of the shirt with the heart facing out).
Step 5: Felt panel
With fabric chalk mark on the felt panel where the eyes, heart and buttons are to be situated. Use a ruler to measure, you'll need it to be fairly accurate.
Cut a small piece of felt slightly larger than the battery, this is for the battery holder (see step 10).
Step 6: Prepare circuit
Lay out your circuit components onto the felt panel and with fabric chalk so you can sketch out the circuit paths. Make sure the paths that you will sew with conductive thread are not too close to each other or criss-cross since this would cause a short circuit.
Step 7: Beating heart
The on/off mechanism of this circuit was a spring sitting above a plate, when the circuit was bumped the spring would hit the plateand the LED would flash. However, I wanted it to be turned on with a push button switch so I pulled the spring away from the plate and tied conductive thread to it.
With a running stitch I sewed along the path leading to the switch and tied the thread to one of the prongs of the switch.
Step 8: Beating heart continued
Using regular thread secure the switch to the felt panel so that it doesn't move or shift.
Step 9: Eyes
(BATTERY + )------>---( SWITCH )------>---(RESISTOR)------>---(LED +)---->---(LED +)
(LED - )------>---(LED -)---->---(BATTERY - )
With one end of conductive thread stitch through the negative loop of the far LED and through the felt. With a running stitch connect to the second LED by stitching through the negative loop and the felt.
Stitch along the path until you get to where the battery will sit and loop through the felt several times to make the negative connection node for the battery (see image below). From here do a running stitch to the switch and loop the thread around one of the prongs of the switch, tie off thread.
Step 10: Eyes continued
Take a new piece of thread and tie the end to the other loop of the resister and with a running stitch move along to the switch and tie the thread to the other prong of the switch. From here sew a path to where the battery will sit. Take the small piece of felt that you cut for the battery holder in step 5 and loop the thread through the centre several times to make the positive node.
Sew the battery holder to the felt along three sides with regular thread, slip the battery into the holder and sew closed the fourth side. Make sure the battery fits snugly and there is good contact between the thread nodes and the poles of the battery.
Secure the switch to the felt using regular thread.
Step 11: Finish circuit panel
Step 12: Velcro on t-shirt
Turn the t-shirt inside out and mark where the other Velcro halves should go. Glue the two Velcro pieces (these should have the loops) onto the t-shirt. Be sure not to get too much glue on it because it can seep through to the other side and stick everything together. Once dry (check bottle label to see how long it takes), attach the felt panel to the t-shirt, turn it right side out and your done!
As you can see, Robot has three buttons on his front panel, so if you felt inclined you can add another component. I was thinking an audio recording of some sort would be a nice addition.