{"id":2640,"date":"2023-04-03T15:13:38","date_gmt":"2023-04-03T15:13:38","guid":{"rendered":"https:\/\/embedwiz.com\/?p=2640"},"modified":"2023-04-06T23:59:53","modified_gmt":"2023-04-06T23:59:53","slug":"arduino-accelerometer-projects","status":"publish","type":"post","link":"https:\/\/embedwiz.com\/arduino-accelerometer-projects\/","title":{"rendered":"Arduino Accelerometer Projects: How To Setup The ADXL335 With Arduino"},"content":{"rendered":"\n<p>In this article, we&#8217;ll look at how to read and convert the raw voltage values into g forces in <strong>Arduino accelerometer projects<\/strong>.&nbsp;<\/p>\n\n\n\n<p>Accelerometers are pretty typical in smartphones today, and besides enabling your device to know which way is up, the component can introduce other critical features.<\/p>\n\n\n\n<p>But the primary function you have to achieve first is to get the readings and convert them into usable data to run the other features. Here&#8217;s how to do that.<\/p>\n\n\n<h2 class=\"simpletoc-title\">Table of Contents<\/h2>\n<ul class=\"simpletoc-list\">\n<li><a href=\"#what-is-an-accelerometer\">What Is an Accelerometer?<\/a>\n\n<\/li>\n<li><a href=\"#how-to-wire-an-accelerometer-to-an-arduino-board\">How To Wire an Accelerometer to an Arduino Board<\/a>\n\n\n<ul><li>\n<a href=\"#adxl335-3axis-accelerometer-pinout\">ADXL335 3-Axis Accelerometer Pinout<\/a>\n\n<\/li>\n<li><a href=\"#pin-connections-between-arduino-uno-and-adxl335\">Pin Connections Between Arduino UNO and ADXL335<\/a>\n\n<\/li>\n<\/ul>\n<li><a href=\"#how-to-read-data-from-the-accelerometer\">How To Read Data from the Accelerometer<\/a>\n\n\n<ul><li>\n<a href=\"#code\">Code<\/a>\n\n<\/li>\n<li><a href=\"#code-explanation\">Code Explanation<\/a>\n\n\n<ul><li>\n<a href=\"#measurement-range\">Measurement Range<\/a>\n\n<\/li>\n<li><a href=\"#ratiometric-output\">Ratiometric Output<\/a>\n\n<\/li>\n<li><a href=\"#code\">Code<\/a>\n\n<\/li>\n<li><a href=\"#output-conversion-to-acceleration\">Output Conversion to Acceleration<\/a>\n\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<li><a href=\"#possible-project-expansion\">Possible Project Expansion<\/a>\n\n<\/li>\n<li><a href=\"#wrap-up\">Wrap Up<\/a>\n<\/li><\/ul>\n\n<h2 class=\"wp-block-heading\" id=\"what-is-an-accelerometer\">What Is an Accelerometer?<\/h2>\n\n\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/Accelerometer\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">Accelerometers<\/a> are devices used to measure acceleration forces or the rate of velocity changes in an object. <\/p>\n\n\n\n<p>The electrical devices measure these forces in meters\/square second (m\/s<sup>2<\/sup>) or g (<a href=\"https:\/\/en.wikipedia.org\/wiki\/G-force\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">G-forces<\/a>).<\/p>\n\n\n\n<p>G-force is the per unit mass caused by gravity on the earth&#8217;s surface, and one g is equivalent to 9.8m\/s<sup>2<\/sup>.<\/p>\n\n\n\n<p>In electronics, accelerometers are ideal for measuring vibrations and device orientation.<\/p>\n\n\n\n<p>The most typical accelerator module used in electronics projects is the ADXL335. <\/p>\n\n\n\n<p>Based on the 3-axis analog accelerometer IC, the module gives the acceleration in the X, Y, and Z directions as analog voltages statically or dynamically.<\/p>\n\n\n\n<p>Statically measuring the acceleration caused by gravity enables the module to determine and measure tilting. <\/p>\n\n\n\n<p>And sensing dynamic acceleration allows the module to calculate the direction the device is moving.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"492\" src=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-2-1024x492.jpg\" alt=\"A triple-axis accelerometer that is ideal for Arduino projects.\" class=\"wp-image-2644\" srcset=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-2-1024x492.jpg 1024w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-2-300x144.jpg 300w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-2-768x369.jpg 768w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-2-1536x737.jpg 1536w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/1-2-2048x983.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>A triple-axis accelerometer that is ideal for Arduino projects.<\/em><\/p>\n\n\n\n<p>These two properties unlock multiple possibilities, and you can incorporate them into your Arduino projects to develop velocity monitors, musical instruments, wearables, etc.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-wire-an-accelerometer-to-an-arduino-board\">How To Wire an Accelerometer to an Arduino Board<\/h2>\n\n\n<p>You need the following components to interface the accelerometer sensor module to <a href=\"https:\/\/embedwiz.com\/best-arduino-board\/\" target=\"_blank\" rel=\"noreferrer noopener\">Arduino<\/a>.<\/p>\n\n\n\n<ul>\n<li>Arduino board (Arduino UNO board for this project)<\/li>\n\n\n\n<li>Accelerometer-ADXL335<\/li>\n\n\n\n<li>Breadboard<\/li>\n\n\n\n<li>Jumper wires<\/li>\n<\/ul>\n\n\n<h3 class=\"wp-block-heading\" id=\"adxl335-3axis-accelerometer-pinout\">ADXL335 3-Axis Accelerometer Pinout<\/h3>\n\n\n<p>This accelerometer has six pins.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Pin<\/strong><\/td><td><strong>Function<\/strong><\/td><\/tr><tr><td>Vcc<\/td><td>Power supply for the module<\/td><\/tr><tr><td>X-out<\/td><td>Outputs an analog voltage matching the X-axis acceleration<\/td><\/tr><tr><td>Y-out<\/td><td>Outputs an analog voltage matching the Y-axis acceleration<\/td><\/tr><tr><td>Z-out<\/td><td>Outputs an analog voltage matching the Z-axis acceleration<\/td><\/tr><tr><td>GND<\/td><td>Ground pin for ground connection<\/td><\/tr><tr><td>ST (Self-Test)<\/td><td>Controls the module&#8217;s self-test feature<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The self-test feature allows the <a href=\"https:\/\/www.ourpcb.com\/pcb-assembly\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">board<\/a> to test the module&#8217;s functionality in its final application. <\/p>\n\n\n\n<p>When connected to a 3.3V power source, this pin exerts an internal electrostatic force on the accelerometer&#8217;s beam. <\/p>\n\n\n\n<p>This force moves the vibrating <a href=\"https:\/\/en.wikipedia.org\/wiki\/MEMS\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">MEMS<\/a> beam, enabling you to determine if the device functions as required.<\/p>\n\n\n\n<p>If operating normally, the module should output these values.<\/p>\n\n\n\n<ul>\n<li>X-axis: -325mV (-1.08g)<\/li>\n\n\n\n<li>Y-axis: +325mV (+1.08g)<\/li>\n\n\n\n<li>Z-axis: +550mV (+1.83g)<\/li>\n<\/ul>\n\n\n\n<p>When operating the accelerometer module, you can ground this pin or leave it open. <\/p>\n\n\n\n<p>But ensure you don&#8217;t expose it to voltages exceeding 3.6V to avoid permanent damage.<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"pin-connections-between-arduino-uno-and-adxl335\">Pin Connections Between Arduino UNO and ADXL335<\/h3>\n\n\n<p>It is worth noting that the accelerometer sensor module operates on 1.8-3.6V DC (usually 3.3V) but features an onboard voltage regulator to enable seamless interfacing with 5V microcontrollers, such as the Arduino UNO.<\/p>\n\n\n\n<p>So make the microcontroller-accelerometer connections as follows.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Arduino UNO<\/strong><\/td><td><strong>ADXL335<\/strong><\/td><\/tr><tr><td>5V<\/td><td>Vcc<\/td><\/tr><tr><td>A0<\/td><td>X-out<\/td><\/tr><tr><td>A1<\/td><td>Y-out<\/td><\/tr><tr><td>A2<\/td><td>Z-out<\/td><\/tr><tr><td>GND<\/td><td>GND<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Also, ensure you connect the Arduino&#8217;s AREF and 3.3V pins to change the board&#8217;s analog reference voltage for better accuracy.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh4.googleusercontent.com\/iDlm4cnJg2ek7Ls35WI3y0OpSvAp8iu-jfErstZtorw4H1vOz5wwR0Z1CjuTPJSzyScImJ2o2vPXdqPIjFESI5UM7N8uspZ97eJg816SoQPhCkU6oOjFVQH-mszQCDi1dcNfedX2X47IyapXGxTkAA\" alt=\"\"\/><\/figure>\n\n\n\n<p><em>A circuit diagram of the connection between the ADXL335 accelerometer and Arduino UNO<\/em><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-read-data-from-the-accelerometer\">How To Read Data from the Accelerometer<\/h2>\n\n\n<p>We&#8217;ll write code on the Arduino IDE to display the ADXL335 accelerometer sensor&#8217;s output on a serial interface.&nbsp;<\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"code\">Code<\/h3>\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh3.googleusercontent.com\/ktPdIA69D_2QRC8hmNcvhkdfrSjwcx44-wPfUC59zEqBvr44-V5K796xNZTS_nXqyYScfVs4Cu8e7JVGCVsEmUn2gmZnrylzIrUg66zYyl1Kd43mRYEJgmumICRFdh4ZEj_CQNEwA-WZi_abej1SZw\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh4.googleusercontent.com\/9RbFr5Rf3Qd1pAwpd1SmZVxRFtxRkoZA-wDPDl6iFAny1DxjDSe5BgWlXOBCFB9b6YNH8rK-cj1TgHhgQaauuMqzrGQv83jOkJGz0W6Y8GkvWaT0gT6-jR3YmTn3QmXVsF17WBmhy7h37tspFNkhCg\" alt=\"\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh4.googleusercontent.com\/fz4lJAIpCkGYDipJH7CZ0y_sFwIdyzwTZIE2uWDH9255qGPLzxe_j9PiMHOF690hPgUgytNGbbkBjvz3DyHA0KuQN0IPa_WL-nZ-vD_ZdUCLtGmtim3u1Feat4yY5MYQFKBJeyF3dli6YB80ZVbCwQ\" alt=\"\"\/><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"code-explanation\">Code Explanation<\/h3>\n\n\n<p>Before diving into the code explanation, let&#8217;s analyze the accelerometer&#8217;s measurement range and ratiometric output.<\/p>\n\n\n<h4 class=\"wp-block-heading\" id=\"measurement-range\">Measurement Range<\/h4>\n\n\n<p>The module&#8217;s sensing range is +\/-3g. So if accelerated to 4g, the accelerometer output might rail. <\/p>\n\n\n\n<p>But the sensor won&#8217;t fail or get damaged. <\/p>\n\n\n\n<p>The maximum it can handle is 10,000g before experiencing failure, which is way more than the human body can handle. <\/p>\n\n\n\n<p>So you don&#8217;t have to worry about this issue.<\/p>\n\n\n<h4 class=\"wp-block-heading\" id=\"ratiometric-output\">Ratiometric Output<\/h4>\n\n\n<p>As for its sensitivity\/ratiometric output, the board&#8217;s variable voltage output increases linearly across the range. <\/p>\n\n\n\n<p>So a 0g accelerometer reading (middle of the -3g to +3g range) maps to 1.65V (half of the 3.3V) power supply voltage. <\/p>\n\n\n\n<p>Similarly, 0V translates to -3g, while 3.3V maps to +3g.<\/p>\n\n\n<h4 class=\"wp-block-heading\" id=\"code\">Code<\/h4>\n\n\n<p>So, looking at the code, we begin by declaring the pins through which the accelerometer data will pass to get to the Arduino board (via its analog input pins).<\/p>\n\n\n\n<p>Arduino has a 10-bit <a href=\"https:\/\/en.wikipedia.org\/wiki\/Analog-to-digital_converter\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ADC<\/a>, implying 0-1023 integer values (2^10=1024). <\/p>\n\n\n\n<p>So we define the minimum and maximum values to enable the microcontroller to map the 0-3.3V output from the accelerometer into these values.<\/p>\n\n\n\n<p>Next, the sample size variable tells the Arduino to take several samples for each conversion to increase accuracy. <\/p>\n\n\n\n<p>Ten is a good number.<\/p>\n\n\n\n<p>In the Void Setup() function, we first set Analog Reference to external to avoid shorting the active reference voltage generated internally and the AREF pin. <\/p>\n\n\n\n<p>Remember, we connected these two pins to create a reference voltage for accuracy enhancement. <\/p>\n\n\n\n<p>Failure to call and set the Analog Reference function can damage the microcontroller board.<\/p>\n\n\n\n<p>After that, initiate the serial communications with the PC by setting the baud rate to 9600.<\/p>\n\n\n\n<p>In the Void Loop function, the Arduino board reads analog voltage outputs from the accelerometer every 200ms. <\/p>\n\n\n\n<p>We use ReadAxis() instead of analogRead() because it takes the ten ADC accelerometer values and gives the average.<\/p>\n\n\n<h4 class=\"wp-block-heading\" id=\"output-conversion-to-acceleration\">Output Conversion to Acceleration<\/h4>\n\n\n<p>After reading the voltage from each axis, the next step is to convert the data into g-force or acceleration, and the ratiometric output comes into play. <\/p>\n\n\n\n<p>The map() function handles this process by mapping -3000 to the minimum value (0V), +3000 to the maximum value (3.3V), and the other values in between. <\/p>\n\n\n\n<p>The -3000 and +3000 values represent the measurement range of the ADXL335 (+\/-3g).<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"664\" src=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/2-2.jpg\" alt=\"G-force measurements on a sports car\u2019s dashboard\" class=\"wp-image-2643\" srcset=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/2-2.jpg 1000w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/2-2-300x199.jpg 300w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/2-2-768x510.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>G-force measurements on a sports car\u2019s dashboard<\/em><\/p>\n\n\n\n<p>So if yRaw=0 (accelerometer output is 0V on the Y axis), the map function will return -3000. <\/p>\n\n\n\n<p>If the sensor&#8217;s variable voltage output is 1.65V, yRaw will be equivalent to 511, and the map function will return 0, while 3.3V will map to 1023. <\/p>\n\n\n\n<p>In this case, the map function will return 3000.<\/p>\n\n\n\n<p>The next step is to convert the raw values to fractional Gs by dividing the values by 1000, then display the results on the serial monitor.<\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"possible-project-expansion\">Possible Project Expansion<\/h2>\n\n\n<p>Once you get this basic Arduino project working, you can expand the system to build a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Pedometer\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">pedometer<\/a> that counts the number of steps. <\/p>\n\n\n\n<p>You will need an LCD I2C module, a 16*2 LCD, and a battery to make the pedometer portable. <\/p>\n\n\n\n<p>Also, you might have to switch the UNO for a Nano, which is more compact and breadboard friendly.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-1.jpg\" alt=\"A wearable pedometer\" class=\"wp-image-2642\" srcset=\"https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-1.jpg 1000w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-1-300x200.jpg 300w, https:\/\/embedwiz.com\/wp-content\/uploads\/2023\/04\/3-1-768x512.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><em>A wearable pedometer<\/em><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"wrap-up\">Wrap Up<\/h2>\n\n\n<p>As you can see, reading and converting the raw voltage values from accelerometers using Arduino is not challenging. <\/p>\n\n\n\n<p>And once you get this data, you can use this simple sensor to build several projects that require vibration measurement and orientation checking. <\/p>\n\n\n\n<p>So get this code into your project, then be creative. <\/p>\n\n\n\n<p>And contact us if you encounter any challenges. We&#8217;ll be happy to help.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we&#8217;ll look at how to read and convert the raw voltage values into g forces in Arduino accelerometer projects.&nbsp; Accelerometers are pretty typical in smartphones today, and besides enabling your device to &#8230; <a title=\"Arduino Accelerometer Projects: How To Setup The ADXL335 With Arduino\" class=\"read-more\" href=\"https:\/\/embedwiz.com\/arduino-accelerometer-projects\/\" aria-label=\"More on Arduino Accelerometer Projects: How To Setup The ADXL335 With Arduino\">Read more<\/a><\/p>\n","protected":false},"author":9,"featured_media":2641,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Arduino Accelerometer Projects<\/title>\n<meta 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