MPU6050 Accelerometer

[Son Huynh]

Hi,

I'm pretty new to Node-Red and new to programming in general. How would I go about getting accelerometer data from an Invensense MPU6050 and graph it the 3 axis? I've tried searching for stuff on the npm website and node-red website but coming up short on finding a premade node. Thank you in advance!

[Colin Law]

Googling for
Invensense MPU6050 node red
yields a number of hits that look as if they might get you started.

Colin

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[Son Huynh]

Thanks Colin,

I've actually read through all the posts using that search before. The closest I've come to something is from this page:

https://github.com/rwaldron/johnny-five/blob/master/docs/accelerometer-mpu6050.md

I've also found this before:

https://flows.nodered.org/flow/f8c7a94454f79d3cfdc5

But I do not understand what I2C is and it's also missing a node called nodebot.

When i started this, i thought creating a graphic display would be as easy as reading from the GPIO pins and displaying the data onto the graph or a gauge.

There are actually three sensors I'm working on. Temperaure (which is done), accelerometer, and current.

[Son Huynh]

Sorry I forgot to include, I found the page for the Johnny-five thing but I'm not really sure what to do with it.

On Thursday, March 23, 2017 at 11:41:53 AM UTC-5, Son Huynh wrote:

[Julian Knight]

https://learn.sparkfun.com/tutorials/i2c

http://www.robot-electronics.co.uk/i2c-tutorial

https://www.i2c-bus.org/i2c-bus/

It is a type of serial communications for microcontroller systems and only requires 2 pins for multiple sensors.

Jonny5 is a robot control interface that relies on having Firmata installed on a microcontroller such as an Arduino - I think - a long time since I looked at it to be honest as it didn't meet my requirements.

Maybe try this instead: https://www.npmjs.com/package/node-red-contrib-i2c

I can't be bothered with the faff of GPIO on the Pi so I always use a separate microcontroller. But plenty of people do use it just fine.

[Colin Law]

According to [1] the device can communicate over an I2C or SPI bus,
but have you really got a naked device or is it already mounted on a
board of some sort with supporting logic? If so then the interface may
be different.

[1] https://www.invensense.com/products/motion-tracking/6-axis/mpu-6050/

Colin

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[Son Huynh]

At the moment my connections are straight from the sensor to the RPI itself. Only difference is that I'm using the breadboard and a Sparkfun wedge.

On Thursday, March 23, 2017 at 11:41:53 AM UTC-5, Son Huynh wrote:

[Colin Law]

In that case you will have to learn about I2C I think.

Colin

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[Son Huynh]

thank you guys for your help, will this be the same way for me to detect current? I have it going through an ADC.

On Thursday, March 23, 2017 at 11:41:53 AM UTC-5, Son Huynh wrote:

[Colin Law]

It depends on what ADC you are using.

Colin

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[Son Huynh]

I'm trying to use the I2C tool Julian suggested, but I'm not really understanding what 's asking because I've tried using the address 68 and I'm getting the same error

[Colin Law]

What same error?

Colin

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[Son Huynh]

Oh sorry,

In the three pictures from the previous reply. "Type error: Failed to set address." I don't understand the address or the command the I2C node is looking for. I've tried 68,104, 150, 1101000, 1101001. There is also a second screen asking the default address, which I don't understand why would it ask for the address AND default address. When I used sudo i2c detect -y 1, the picture showed address 68 for the MPU6050. Please Ignore the 80 and 503 payload. That is the current sensor and temperature payload.

What same error?

Colin

[Colin Law]

The note at the bottom of the window says that you must start the address with #.

Colin

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[Son Huynh]

it doesn't let me type in #