How to make a Heating and Cooling Jacket

Step 19 Sewing Your Heating Circuit

The relay acts like a switch, turning the circuit on or off as needed. The code we have written will open or close the relays, which will allow the different systems to run at different times. The diagram of the relay is helpful. When you order your relay, look at the website's diagram to see the functions of the different relay prongs and make sure you have the right connections. You can also look at our diagram to get more help.

1.       You will have both a positive and a negative prong on the relay that you will connect to the battery and to the Lilypad.

2.       Wire/sew the positive of the load (battery) on the relay to the positive on the battery.

3.       Wire/sew the negative of the load (battery) on the relay to one end on the heating wire.

4.       Wire/sew the other end of the heating wire to the negative on the battery. This will connect the heating into a loop that will either be turned off or on by the relay.

5.       Wire/sew the positive to the one of the analog ports on the Lilypad. For the heating system, we used port 3, which is also used in our code.

6.       Wire/sew the negative to the negative on the Lilypad. A trick that you can do is connect it to the negative of your temperature sensors, since they all go to the same spot. This way you can use less thread.

7.       You should have a working circuit now, but remember this circuit may be different if you used a different relay than we did. You then should base your wiring off the diagram given for your specific relay.