Connecting Adafruit 1714 IMU and SD card

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jomill
 
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Connecting Adafruit 1714 IMU and SD card

Post by jomill »

I have 9-DOF IMU Breakout - L3GD20 + LSM303 Adafruit 1714 [ADA-1714]

and

-MicroSD card breakout board+ Adafruit 254
-SD Module (Arduino Compatible) DFRobot DFR0071

I need to connect IMU to SD card reader.

How i connect pins?

Do i need to create txt file to card with settings?

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Franklin97355
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by Franklin97355 »

What are you using as a microcontroller?

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jomill
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by jomill »

franklin97355 wrote:What are you using as a microcontroller?
Microcontroller?

My previous IMU was Mongoose IMU connected directly to OpenLog like this:

Mongoose > OpenLog

TX > RXI
RX > TXO
3.3 > VCC
GND > GND

And i needed to create text file to SD-card with baud settings, Then it just worked.

I want to keep this as simple as possible.

Thanks

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Franklin97355
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by Franklin97355 »

I don't see any way to do that without a microcontroller in the mix somewhere.

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adafruit_support_mike
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by adafruit_support_mike »

The Mongoose IMU has a built-in LPC2148 microcontroller (the large chip in the center). The Adafruit 9-DOF board only has the sensors, so you need to supply an external microcontroller.

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jomill
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by jomill »

adafruit_support_mike wrote:The Mongoose IMU has a built-in LPC2148 microcontroller (the large chip in the center). The Adafruit 9-DOF board only has the sensors, so you need to supply an external microcontroller.
Thanks.

If i buy microcontroller, do i need anything else? Do i need to do any programming etc or can this be done by newbie?

I could buy these:
PICAXE 14M2 Microcontroller (14 pin) Sparkfun COM-10802
PICAXE 18M2 Microcontroller (18 pin) Sparkfun COM-10187
PICAXE 20M2 Microcontroller (20 pin) Sparkfun COM-10807
Trinket - Mini Microcontroller - 3.3V Logic Adafruit 1500 (this look too big for me)
Trinket - Mini Microcontroller - 5V Logic Adafruit 1501 (this look too big for me)

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adafruit_support_mike
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by adafruit_support_mike »

You'd need all the external hardware necessary to make the microcontroller run (pretty much what we've built into the Trinket).

You'd also need to load software into the microcontroller that lets it know how to talk to the sensors. We have our own code libraries for the AVR/Arduino platform, but not for the PIC platform.

You wouldn't be able to use the Trinket with an SD card because the microcontroller on that doesn't have enough memory. You'd need something like the Arduino Micro: https://www.adafruit.com/products/1315

Other boards in the same size range are:

- https://www.adafruit.com/products/659 - Adafruit Flora
- https://www.adafruit.com/products/296 - Adafruit ATmega32u4 breakout
- https://www.adafruit.com/products/199 - Teensy 2.0

but those don't use the Arduino bootloader or base libraries. You'd need to port the Adafruit libraries to that hardware.

Of the three, the Teensy is the smallest, and it has a good support community. Paul Stoffregen, who makes that board, works with us to make sure his boards stay in sync with our hardware, and vice versa.

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jomill
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by jomill »

adafruit_support_mike wrote:You'd need all the external hardware necessary to make the microcontroller run (pretty much what we've built into the Trinket)...
Thanks, this is way too complicated for me.

What other inexpensive 9-10 DOF IMUs are out there with SD-card slot? Or with microcontroller which don't require any programming, just connect wires between IMU and SD-card writer?

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adafruit_support_mike
 
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Re: Connecting Adafruit 1714 IMU and SD card

Post by adafruit_support_mike »

I doubt there are any sensor clusters that write data to an SD card without a microcontroller. SD cards speak a fairly complicated language, and there's no reason to build support for that languge into a sensor chip.

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