A sensor to measure acceleration.

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how to calibrate ADXL345 accelerometer?

I have ADXL345 digital accelerometer by Analog Devices. I use Beaglebone ADXL345 library that exist here: http://inspire.logicsupply.com/2014/08/beaglebone-3-axis-accelerometer.html So I can read the ...
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89 views

MPU6050 DMP values read

I am using MPU6050 breakout board IMU along with ATtiny2313 microcontroller to get the accelerometer and gyroscope values from the IMU. Here's the question : I want to know what values are computer ...
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1answer
40 views

accelerometers vs gyroscopes

In terms of semiconductor integrated circuits, is there any difference between an accelerometer or a gyroscope? are they the same part? Can I get a IC recommendation for something with 3 axis?
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1answer
39 views

ADXL 335 Accelerometer incorrect Output. z and y axes always the same

I have an ADXL 335 Accelerometer. I'm checking its output voltage values using a multimeter and I'm consistently getting the z and y axes giving me the same result. How do I trouble shoot this ...
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2answers
59 views

Understanding use of accelerometers to measure angular (rotational?) accelerataion

Imagine this: A rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to 90 degrees back-and-forth (in the xy plane), so does the rod. My goal is to measure the instantaneous ...
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1answer
100 views

Reading MPU-6050 with MSP430g2553 using I2C

I´ve been searching for libraries or documentations for helping me reading from and writing to the acell + gyro breakout MPU-6050 from InvenSense. I managed to read it with the arduino's libraries ...
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3answers
64 views

Using change in magnitude of accelerometer to calculate speed?

I have a wheel (say 60cm in diameter). And I am planning to attach a small board with an AVR and an accelerometer about 10-20cm from the centre. As the wheel spins, I will get acceleration outwards. ...
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67 views

3-wire SPI Interface between Arduino (Teensy 3.1) and Accelerometer (ADXL344 or ADXL345)

I'm having problems in interfacing and receiving data from the Accelerometer (ADXL344) to my Arduino (Teensy 3.1). I have connected the pins as shown in the attached schematic. Furthermore, I have ...
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29 views

MPU6050 not coming out of sleep mode

I am using the accelerometer-gyroscope-temperature sensor ic MPU6050. When first powered ON, the sleep bit in the power_management_register_1 (bit6) has to be reset so as to start the working of the ...
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71 views

Collision direction using an accelerometer

I'm trying to determine the direction on a vehicle that a collision occurred. After some threshold value is met I've tried a couple of different approaches to determine which direction the collision ...
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23 views

What sensors to use to track posture devation?

After a cursory glance through google I could not find any information if such a thing is even possible. I believe that its not possible using something like a gyroscope or accelerometer due to the ...
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2answers
66 views

Is one accelerometer enough for detecting tilt/orientation of a rigid body?

I posted this question earlier in physics.stackexchange, but I think this is actually the best place for it. I’m not familiar with sensor hardware, and I don’t really know how an accelerometer works. ...
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71 views

Problem in reading accelerometer axis (ATMEGA328P + ADXL345)

I really need help with my project. I'm trying to connect ADXL345 with ATMEGA328P through SPI interface to send received data from Atmega328P to PC via UART interface. The ATMEGA328P is sending the ...
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1answer
151 views

ADXL345 Arduino UNO Activity Inactivity interrupt

I have DATA_READY, Activity and Inactivity interrupts mapped from INT1 to INT0 on the arduino. DATA_READY works fine, the problem is Activity and Inactivity are always set to 0 in the INT_SOURCE ...
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1answer
180 views

Understanding how to use an accelerometer to detect vehicle collisions

Objective: To use an accelerometer to detect where on a vehicle a crash occurred (e.g. impact occurred on the passenger side.). Parts: Arduino Uno and LSM3030DLHC accelerometer Background: I've been ...
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2answers
270 views

Accelerometer double integration error

I wanted to use an accelerometer or IMU to measure speed and displacement over a period of about 1 minute or 400m. From this answer I found at stackoverflow, the error propagates at a rate of \$t^2\$ ...
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1answer
165 views

ADXL345 Arduino UNO data_ready interrupt

I would like the sensor values to be updated each 10ms(100Hz) and then run the algorithm and repeat the same process. However, after timing the algorithm it is taking only 2ms, I think the data_ready ...
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1answer
138 views

Using an External interrupt from any pin PIC16F873A

I'm trying to use an interrupt, which will occur on a rising edge of a signal coming from my LSM303DLHC accelerometer. The accelerometer has a Data Ready (DRDY) signal that fires every time new data ...
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3answers
83 views

Accelerometer Impact/Shock

I am a complete novice when it comes to electrical engineering; however, I'm interested to know the capability of accelerometers. In addition to capturing data on distance traveled, etc. - is an ...
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1answer
44 views

ADXL 345 Noise Issue for my use case

I am building a solution where I want my MCU to wake up based on a trigger generated by accelerometer after detecting an activity. There are a number of samples available for this and I am able to ...
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50 views

Combine LED with accelerometer in small size for violin bow frog

The question was extended from the post: Violin bow position tracking with SMD LEDs and photoresistors. It is easier to understand the problem and the purpose here with the link, but I will elaborate ...
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2k views

Do accelerometers know when they are moving straight up or straight down?

I need a sensor that I can only place on top of an object, to count the number of times the object moves up and down. Would placing an accelerometer on top of the object accomplish this or can it ...
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1answer
69 views

Adding High Byte and Low Byte of LSM303DLHC Accelerometer Output

Interpreting LSM303DLHC Accelerometer Output Hi all, This is my first StackExchange question ever, so I will do my best to be specific and offer as much reference as possible. I'm currently ...
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1answer
49 views

Temperature sensor slope explanation

I am looking at an accelerometer(data sheet is BMA280 ) which has capabilities of measuring temperature from -40 to 85 degrees celsius. It also specifies a Temperature Sensor Slope of 0.5K/LSB, where ...
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1answer
92 views

What's the best method of measuring displacement and speed without resorting to GPS?

Is it possible to determine the displacement, speed and acceleration of someone while running, by using methods like dead reckoning, sensor fusion or other, and sensors like accelerometers, ...
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2answers
75 views

How to determine minimal detectable acceleration on accelerometer?

How can it be determined the minimal detectable acceleration on analog and digital accelerometers? In datasheets I found only specification like sensitivity, noise etc. And how the minimal time for ...
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66 views

MPU6050 registers sometimes reading as 0x00

I'm doing some tests with a MPU6050 accelerometer but sometimes the accelerometer and temperature registers return 0x00 (I have not tested the gyroscope registers). When this happens I still can read ...
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4answers
90 views

How can I sense if a cane is being held upright or fallen down?

I am trying to make a little wireless-connected gizmo to attach to my grandfather's walking cane. The idea is that when it senses the cane has fallen down, it would alert/call one of us so that we can ...
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1answer
43 views

Wiring three-axis accelerometer

I need to wire the following three-axis axis accelerometer: http://docs-europe.electrocomponents.com/webdocs/127c/0900766b8127c68c.pdf Here when I click on ADXL335, the below link comes with some ...
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2answers
190 views

Using adafruit Flora or Adafruit Trinket + MPU-6050 3-Axis Gyroscope + nRF24L01+ together

I am trying to do a project where I need to transmit data from an object if the object is moved in a particular way. The restriction is that the device has to be as thin and small as possible. I am ...
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2answers
84 views

Normalization of Accelerometer Data

I have two different boards, one from TI and one from ST Microelectronics. Both these boards have one accelerometer of different brand. These two accelerometer sensors have different sensitivity. I ...
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0answers
299 views

Calculating angle using MPU6050

I'm using the code from the question Calculating Angles from MPU6050 for my project I'm using a MPU6050, GY-521 and an Arduino Mega 2560 with connections as follows: ...
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2answers
360 views

How do I find source of vibration from a mechanical source outside of my home?

My problem is vibration from a mechanical source outside of my home. I think I have found the source (machinery at a legal marijuana grow op) and need to prove it to get an injunction at court. I ...
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1answer
159 views

LSM9DS0's Accelerometer not reading correctly

I have a LSM9DS0 Gyroscope/Accelerometer/Magnetometer breakout board. I am using an Arduino Uno which operates on 5V. The LSM9DS0 is communicating to the Uno using I2C through a Logic Level Converter. ...
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2answers
159 views

Angular Acceleration: Understanding the differences between Gyroscopes and Accelerometers

I apologize for what is likely an ignorant question, but I am fairly new to electronics and have little confidence. I am working on a personal project where I am using a servo motor to move a rod back ...
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1answer
1k views

Calculating Angles from MPU6050

I've been playing with a GY521 breakout recently with the MPU6050 chip on it, though i've hit a bit of a problem that I can't quite work out I know when I rotated the board I rotated ~90 degrees ...
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1answer
86 views

Choosing sampling rate according to the bandwith reponse in accelerometer datasheet

In an accelerometer's datasheet, the bandwidth response in the x and y axis is 350 Hz. There is another information related to the internal sampling rate (shown below). I don't know how these two ...
0
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1answer
90 views

Temperature compensation accelerometer and cross axis sensitivity calibration

I'm trying to compensate a 3-axis MEMS accelerometer for temperature. I can access a climate chamber where the device can be rotated in ONE axis. There is another place where I can rotate two axis, ...
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0answers
49 views

MEMS Accelerometer/Gyro 3-axis Conversion question

I'm not too familiar with the digital mems signal to analog conversion using a microcontroller. Can you still retain the signal intensity due to rotation of the gyro, or is the output always going to ...
0
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1answer
84 views

Whats the difference between these three breakout boards for the ADXL345 Accelerometer?

I would like to use the ADXL345 in a schematic im working on right now, but as there is no typical/minimal circuit provided within the datasheet i got stuck. I did a bit of research and found three ...
0
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1answer
128 views

Arduino standalone with 9V battery and accelerometer

I'm using an Arduino Mega for a project involving an accelerometer. Everything works fine when the board is connected via USB. When I use a 9V battery plugged in with the 2.1mm jack, values are ...
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46 views

How to Segment Accelerometer Signal at idle points

I'm using an 3 axis Accelerometer(GY-521) to get the acceleration data and also the gyroscope to get the gyro data. I want to segment the signals at the idle points so that i can get the segmented ...
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111 views

Detecting impacts using an accelerometer

I am using the LIS3DSH sensor from ST Microelectronics to detect accidents. For this I need to detect the impact using the variation of the G value, from a sudden shift of 1G to around 16G and also ...
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1answer
196 views

Need 3-axis wireless gyroscope/accelerometer.

So I would like to have a sensor that can detect rotation (around the vertical axis only is needed) and that detects motion (no specific direction, only be able to detect if the sensor is moving). I ...
0
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1answer
67 views

Is accelerometer taking as much power (current) as it needs? [closed]

I want to connect accelerometer to an oscilloscope. I have 3x AA rechargable batteries (2550mAh). I was told that e.g. microcontroller knows how much amps should it take and it wont burn if I ...
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3answers
810 views

Limits of dead reckoning using MEMS sensors

I'm trying to track body parts relative to a person's torso. I see quite a few questions about using MEMS accelerometers and gyros for dead reckoning, and they confirm my suspicions that various ...
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1answer
107 views

Is it possible to measure acceleration in sports activities with an accelerometer

I've been trying to make a simple prototype capable of measuring a punch or a shot put throw with an accelerometer, but suddenly stopped working, and "locked" into a value, has I was testing it. When ...
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1answer
230 views

I2C protocol debugging using oscilloscope

We are testing an I2C accelerometer connected to the ATMega32A micro-controller. The accelerometer was working fine. We can write and read the registers using I2C protocol. When connected to the ...
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0answers
124 views

LSM303DLHC data ready interrupt

I have a STM32F3-discovery board, and I have set up a little test. It just captures ALL input on GPIO3 and count them by channel. Then every seconds, I have a breakpoint with which I look at the ...
0
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1answer
97 views

Calculating mV/g of a sensor

I have constructed a piezo-resistive sensor using graphite. I managed to obtain the output voltage of 0-5V by using the ADC of my Arduino to read the sensor. But I have no idea how to calculate its ...