Heating Pad Hand Warmer Blanket Datasheet by SparkFun Electronics

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HeatingPadHandWarmerBlanket
Whatareheatingpadsgoodfor?
There are a lot of great projects you can use heating pads in, ranging from warming gloves, slippers,
a blanket, or anything you want to keep nice and warm. Got a beard mask you want to make toasty?
Do beards need to be warmer? Not sure. Would it be a fun project? Definitely.
What parts should you consider getting for your project? You can go as simple as getting the
appropriate power supply and a heating pad. One heating pad is rated for 5V, and draws about
600mA.
Part list for a basic setup:
Pick an appropriate power supply (there are tons of options available):
Wall Adapter Power Supply- TOL-08269
Heating Pad COM-11289 or COM-11288
Connector for your power supply (again, tons of options available): DC Barrel Jack Adapter - Male
PRT-10287
Hook-up wire
If you want to add a form of logic or control to your circuit, such as interfacing with sensors, the
easiest way is to add a microcontroller/development board to your project.
Please note: Make sure when using heatpads, not to leave unattended!
Here is a list of other tutorials you might find helpful while following this tutorial:
Basic Lilypad Tutorial
Beginning LilyPad Arduino
DIYProjectIdea:HandWarmerBlanket
A blanket project with two heating pads to keep your hands warm when you are on the
computer/notebook/tablet/phone/playing chess/all other activities.
Part list:
Custom Hand Warmer Blanket SparkFun Wish List
(2) Heating Pad - 5x15cm COM-11289These DC powered heating pads are perfect for
near-body heating applications. They get warm to the touch but not too hot. Simply apply 5VDC to
the wir…
N-Channel MOSFET 60V 30A COM-10213If you've ever wondered how to control the
headlight of a car from a microcontroller, a MOSFET is what you need. This is a very common
MOSFET with ver…
ProtoBoard - Penta-shape PRT-08847**Replacement:** None. We are no longer carrying
this protoboard in our catalog. This page is for reference only.Why not prototype in 3D? The
SparkFun…
Wall Adapter Power Supply - 5V DC 1A TOL-08269High quality switching 'wall wart' AC to
DC 5V 1000mA wall power supply manufactured specifically for Spark Fun Electronics. These are
switch mode pow…
Barrel Jack to 2-pin JST TOL-08734Two pin JST connector to a 2.1x 5.5mm barrel jack,
6.25 inch long jumper cable. We use this cable to adapt from a wall power supply to a relatively
sm…
LilyPad Arduino USB - ATmega32U4 Board DEV-11190The LilyPad Simple just got a
whole lot... simpler. We've updated the Simple board to create the LilyPad USB by replacing the
classic ATMega328 with t…
Hook-up Wire - Red (22 AWG) PRT-08023Standard 22 AWG solid Red hook up wire. Use
this with your bread board or any project in which you need sturdy wire. Comes in small spools of
25'.
Hook-up Wire - Black (22 AWG) PRT-08022Standard 22 AWG solid Black hook up wire.
Use this with your bread board or any project in which you need sturdy wire. Comes in small spools
of 25'.
LilyPad LED Blue (5pcs) DEV-10045Here is a simple 5 pack of blue LEDs for LilyPad, or
whatever else you can dream up. Light up the night! LilyPad is a wearable e-textile technology …
LilyPad Button Board DEV-08776We designed this board to give the user a low profile
button without any sharp edges. Button closes when you push it and opens when you release
(momen…
Conductive Thread Bobbin - 30ft (Stainless Steel) DEV-10867This is 30 feet of conductive
thread spun from stainless steel fiber and wound on a plastic bobbin. Use it to sew up all of your e-
textile projects. T…
View Custom Hand Warmer Blanket on SparkFun.com
There are a lot of parts on this list that can be exchanged for alternate parts, or that aren’t needed at
all, depending on what type of setup you want.
If you do not want to sew or use conductive thread, exchange the Lilypad LEDs and Lilypad
button for through-hole components and solder on a bigger protoboard instead.
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You could use a 3.7 LiPo battery to power both the LilyPad USB board and the heating pads.
Remember: You will still need a MOSFET, because having two heating pads will draw more current
then the LilyPad pins can handle. This option is nice, since you can use the LilyPad to charge the
LiPo battery when the heating pad isn’t in use. The draw back to using a 3.7v LiPo battery is that the
heating pads won’t get as warm as they would with a 5v (or higher) power supply.
In this setup we use the LilyPad USB, because you won’t have to get an extra FTDI basic for an
USB connection.
Directions
The first step is to select your fabric. When picking a fabric, you want to consider the following:
Is the pattern on the fabric going to work, or look out of place? If you are going Snuggie style,
will you need to add extra fabric for the arms?
On what level of awesome is the fabric you are selecting? Meaning, how fast are you going
to get sick of looking at it?
Is the fabric thick, cozy, and going to keep the rest of your body warm? Sheer, light fabrics
don’t help to keep you warm during the winter months.
If you don’t have a sewing machine, or don’t want to sew, you can do a No-Sew blanket and be
creative when adding a pouch that holds your heating pads and circuit. No-Sew blanket tutorials
Circuit
Hereisadiagramofthecircuitsetup:
Copy Code elements get, and three LED; will indicate low, medium, and high levels. */ int btnPin : 2; b0 ; void Setup() { // initialize the digital pin as an outputl pinMcde(btnPin, INPUT); pinMode(f SS mode : 3, than reset to 9 if (btnPreSSed 8.8. digitalRead(btnPin) LOW) mode : mode ed3, Low); break; case 1: analogwrite(fetPin, as); //33% duty cycle digitaIWrite(led1, HIGH); ak; case 3: analcgwriteaetpin, 255); //120% duty cycle digitalwriteuedl, HIGH); digitalwrite
Please note: As you can see, the LilyPad LEDs and Lilypad Button were sewn into the fabric, but
you can easily switch these for normal, through-hole LEDs, and a button soldered on a protoboard
with the other soldered components.
Important! Make sure to solder hook-up wire to your heating pad connections. DO NOT try to
use conductive thread to connect the two heating pads.
ExampleCode
CopyCode/*HeatingPadHandWarmerBlanketCodeExampleSparkFunElectronics,Pamela,1/24/
2013BeerwareLicenseHardwareConnections:‐led1=D9;‐led2=D10;‐led3=D11;‐button=D2
;‐Mofset=D3;Usage:Hittheswitchtopower,hitthebuttontoadjusthowwarmtheheating
elementsget,andthreeLEDswillindicatelow,medium,andhighlevels.*/intbtnPin=2;bo
oleanbtnPressed=false;intfetPin=3;intled1=9;intled2=10;intled3=11;intmode
;voidsetup(){//initializethedigitalpinasanoutput.pinMode(btnPin,INPUT);pinMode(f
etPin,OUTPUT);pinMode(led1,OUTPUT);pinMode(led2,OUTPUT);pinMode(led3,OUTPUT);}//the
looproutinerunsoverandoveragainforever:voidloop(){//Incrementmodeondepress,unle
ssmode=3,thenresetto0if(btnPressed&&digitalRead(btnPin)==LOW)mode=mode==3?
0:mode+1;//AssignbuttonstatebtnPressed=digitalRead(btnPin);switch(mode){case0:
analogWrite(fetPin,0);//offdigitalWrite(led1,LOW);digitalWrite(led2,LOW);digitalWrite(l
ed3,LOW);break;case1:analogWrite(fetPin,85);//33%dutycycledigitalWrite(led1,HIGH);
digitalWrite(led2,LOW);digitalWrite(led3,LOW);break;case2:analogWrite(fetPin,170);//6
6%dutycycledigitalWrite(led1,HIGH);digitalWrite(led2,HIGH);digitalWrite(led3,LOW);bre
ak;case3:analogWrite(fetPin,255);//100%dutycycledigitalWrite(led1,HIGH);digitalWrite
(led2,HIGH);digitalWrite(led3,HIGH);break;}}
There you go! As with any DIY project, you should always customize and tweak what you want for
maximum awesomeness.
If you liked this project, we recommend checking out the following tutorials:
Twinkling Fairy Wings
LilyFlyer
https://learn.sparkfun.com/tutorials/heatingpadhandwarmerblanket?_ga=2.193913508.826447105.1513013365708122626.1510601933121117

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