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Pulse Sensor Getting Started Guide
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1 A 24 inch Color Coded Cable with male header connectors You ll find this makes it easy to embed the. sensor into your project and connect to an Arduino No soldering is required. 2 An Ear Clip perfectly sized to the sensor We searched many places to find just the right clip It can be hot. glued to the back of the sensor and easily worn on the earlobe. 3 2 Velcro Dots These are hook side and are also perfectly sized to the sensor You ll find these velcro dots. very useful if you want to make a velcro or fabric strap to wrap around a finger tip. 4 Velcro strap to wrap the Pulse Sensor around your finger. 4 3 Transparent Stickers These are used on the front of the Pulse Sensor to protect it from oily fingers and. sweaty earlobes, 5 The Pulse Sensor has 3 holes around the outside edge which make it easy to sew it into almost anything. Let s get started with Pulse Sensor Anatomy, The front of the sensor is the pretty side with the Heart logo This is the side that makes contact with. the skin On the front you see a small round hole which is where the LED shines through from the back and. there is also a little square just under the LED The square is an ambient light sensor exactly like the one used. in cellphones tablets and laptops to adjust the screen brightness in different light conditions The LED shines. light into the fingertip or earlobe or other capillary tissue and sensor reads the light that bounces back The. back of the sensor is where the rest of the parts are mounted We put them there so they would not get in the. way of the of the sensor on the front Even the LED we are using is a reverse mount LED For more about the. circuit functionality check out the Hardware page needs link. The cable is a 24 flat color coded ribbon cable with 3 male header connectors. RED wire 3V to 5V, BLACK wire GND, PURPLE wire Signal. The Pulse Sensor can be connected to arduino or plugged into a breadboard Before we get it up and. running we need to protect the exposed circuitry so you can get a reliable heart beat signal. Preparing the Pulse Sensor, Before you really start using the sensor you want to insulate the board from your naturally sweaty oily. fingers The Pulse Sensor is an exposed circuit board and if you touch the solder points you could short the. board or introduce unwanted signal noise We will use a thin film of vinyl to seal the sensor side Find the. small page of four clear round stickers in your kit and peel one off Then center it on the Pulse Sensor It. should fit perfectly, When you are happy with the way it s lined up squeeze it onto the face all at once The sticker made.
of vinyl will kind of stretch over the sensor and give it a nice close fit If you get a wrinkle don t worry just. press it down really hard and it should stick We gave you 4 so you can replace it if necessary. That takes care of the front side The vinyl sticker offers very good protection for the underlying circuit. and we rate it water resistant meaning it can stand to get splashed on but don t throw it in the pool. If this is your first time working with Pulse Sensor you re probably eager to get started and not sure if. you want to use the ear clip or finger strap or other thing The back of the Pulse Sensor has even more. exposed contacts than the front so you need to make sure that you don t let it touch anything conductive or. The easiest and quickest way to protect the back side from undesireable shorts or noise is to simply. stick a velcro dot there for now The dot will keep your parts away from the Pulse Sensor parts enough for you. to get a good feel for the sensor and decide how you want to mount it You ll find that the velcro dot comes off. easily and stores back on the little strip of plastic next to the other one. Notice that the electrical connections, are still exposed We only recommend. this as a temporary setup so you can, get started We show you how to better. seal the Pulse Sensor later in this, Running The Pulse Sensor Code. Get the latest Arduino and Processing Pulse Sensor software here http pulsesensor com downloads. Arduino code is called PulseSensorAmped Arduino xx. The Processing code is called PulseSensorAmped Processing xx. We strongly advise that you DO NOT connect the Pulse Sensor to your body while your computer or arduino is. being powered from the mains AC line That goes for charging laptops and DC power supplies Please be safe. and isolate yourself from from the power grid or work under battery power. Connect the Pulse Sensor to V red Ground black and Analog Pin 0 purple on your favorite Arduino or. Arduino compatible device and upload the PulseSensoAmped Arduino xx sketch. note If you want to power Pulse Sensor Amped, with low voltage 3 3V for example make sure. you have this line of code in the setup, analogReference EXTERNAL.
Also make sure that you apply the lower voltage, to the Arduino Aref pin next to pin 13. After it s done uploading you should see Arduino pin 13 blink in time with your heartbeat when you hold the. sensor on your fingertip If you grip the sensor too hard you will squeeze all the blood out of your fingertip and. there will be no signal If you hold it too lightly you will invite noise from movement and ambient light Sweet. Spot pressure on the Pulse Sensor will give a nice clean signal You may need to play around and try different. parts of your body and pressures If you see an intermittent blink or no blink you might be a zombie or a robot. To view the heartbeat waveform and check your heart rate you can use the Processing sketch that we. made Start up Processing on your computer and run the PulseSensorAmped Processing xx sketch This is. our data visualization software and it looks like this. note If you get an error when starting this code you may need to make sure you are selecting the right. serial port Check the Troubleshooting section below. The large main window shows a graph of raw sensor data over time The Pulse Sensor Data Window can be. scaled using the scrollbar at the bottom if you have a very large or very small signal At the right of the screen. a smaller data window graphs heart rate over time This graph advances every pulse and the Beats Per. Minute is updated every pulse as a running average of the last ten pulses The big red heart in the upper right. also pulses to the time of your heartbeat When you hold the Pulse Sensor to your fingertip or earlobe or fill in. body part here you should see a nice heartbeat waveform like the one above If you don t and you re sure. you re not a zombie try the sensor on different parts of your body that have capillary tissue We ve had good. results on the side of the nose middle of the forehead palm and lower lip We re all different original. organisms Play around and find the best spot on you and your friends As you are testing and getting used to. the sensor You may find that some fingers or parts of fingers are better than others For example I find that. when I position the sensor so that the edge of the PCB is at the bottom edge of my earlobe I get an awesome. signal Also people with cold hands or poor circulation may have a harder time reading the pulse Run your. hands under warm water or do some jumping jacks, Arduino and Processing programming environments available for download here. www arduino cc www processing org, Sealing the Back Side of Pulse Sensor. Basic protection for the back of the Pulse Sensor, and prep for attaching Velcro Dot. It s really important to protect the exposed Pulse Sensor circuitry so the sweat of your fingertips or earlobe or. wherever doesn t cause signal noise or a short circuit This How To uses hot glue which can be removed. easily or re worked if you want to change where you ve stuck your Pulse Sensor We love hot glue. The other things you ll need are, Hot Glue Gun, Blue Tape any tape should do ok.
Nail Trimmers or your favorite trimming device Flush cut wire snips work well too. Read these instructions all the way through before you start. First attach the clear vinyl sticker to the front of your Pulse Sensor as shown above Then put a blob of. hot glue on the back right over the circuit Size can be difficult to judge sometimes What I meant was put a. hot glue blob about the size of a kidney bean on the back side of the Pulse Sensor. Then while the glue is still very hot press the Pulse Sensor glue side down onto the sticky side of a piece of. blue tape I believe that blue tape has magical properties but if you don t have blue tape other kinds of tape. will work just as well, note The tallest thing on the back of the Pulse Sensor is. the green LED housing right in the middle Use it to make. the hot glue seal thin and strong When you press evenly. until the back of the LED touches all the conductive parts. will be covered with hot glue If the glue doesn t ooze out. all around let it cool down then peel if from the Pulse. Sensor and try again Once the glue has cooled down and. has some body you can peel it off easily Here s some. pics of hot glue impressions that I took during the making. of this guide, Next put a small dab of hot glue on the front. of the cables where they attach to the Pulse, Sensor circuit board This will bond to the other. glue that s there and act as a strain relief for the. cable connection This is important because the, cable connection can wear out over time. Once the hot glue has cooled wait for it, the blue tape will peel off very easily Check.
your work to make sure that there are not, exposed electrical connections. Next is trimming I find the easiest way is to, use nail clippers Flush cutting wire snips work. too Take care not to clip the wires, And leave enough around the cable to act. as a good strain relief, This is the basic Pulse Sensor Hot Glue Seal It s also got the clear vinyl sticker on the front face We re calling. this Water Resistant ready to be handled and passed around from fingers to earlobes or whatever It is not. advised to submerge or soak the Pulse Sensor with this basic seal. Now you can stick on the velcro dot included and make a finger strap with the velcro tape included. Attaching the Ear Clip, We looked all over and were lucky enough to find an ear clip that fits the Pulse Sensor perfectly The.
earlobe is a great place to attach Pulse Sensor Here s some instruction on how to do it. It is important to apply some strain relief to the cable connection where it meets the Pulse Sensor PCB. The little wire connections can wear out and break or short on something over time We can do this with hot. glue like we did in the previous example, First attach a clear vinyl sticker to the front of the Pulse Sensor if you have not already Then put a. small dab of hot glue on the front of the cables right where they meet the PCB Get some on the edge of the. PCB too that will help Remember if you don t like the blob you ve made for any reason it s easy to remove. once it cools down, Next place the Pulse Sensor face down and put a dab of glue about the size of a kidney bean on the. back as illustrated above Center the round part of the ear clip on the sensor and press it into the hot glue The. tallest component on the back is the plastic body of the reverse mount LED and if you press it evenly it will. help keep the metal of the ear clip from contacting any of the component connections. Allow the hot glue to ooze out around the ear clip That will ensure good coverage Take care not to let. the hot glue cover around the ear clip hinge as that could get in the way of it working Trimming is easy with. nail clippers as above or your trimming tool of choice Don t trim the wires by mistake. Take a good look at your work with a magnifying glass to be sure that you haven t made contact with any of. the solder joints then plug it in and test it Hot glue is also great because it is easy to remove or re work if you. Troubleshooting, Processing Sketch gives me a COM port error at startup. Make sure you are plugged into an Arduino board that it is working correctly and running our firmware. Check to see if you have the right serial port The code underlined in red should match the correct port. number in the terminal window at the bottom of Processing IDE. Processing gives an RXTX mismatch warning then nothing happens. The RXTX mismatch problem can be resolved by making sure you are running the latest version of. Processing and Arduino, If you re still having trouble go to http processing org reference libraries serial index html for more info. Pulse Sensor Getting Started Guide Introduction Pulse Sensor is a well designed plug and play heart rate sensor for Arduino It can be used by students artists athletes makers and game amp mobile developers who want to easily incorporate live heart rate data into their projects The sensor clips onto a fingertip or earlobe and plugs right into Arduino with some jumper cables It also

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