Arduino Gyro Sensor to Spark Core [SOLVED]

Troubleshooting
1

I am having trouble initializing and reading data from an I2C MPU3050 Gyro sensor designed for the Arduino. I am able to get the sensor working on an Arduino and read the data; however, the same code and connection on the Spark Core produces no output. The first command issued was a WhoAmI request that failed. The wire.endtransmission() produced an error value of 4. I would appreciate any feedback.

2

Hi @jdhchow

One of the differences between Spark and Arduino is that Spark always requires pull-up resistors on I2C.

Do you have pull-ups on the two I2C lines? 4.7KOhm is ideal but lots of values will work OK.

3

Thanks for you quick comment!

I only have 10k, 1k and 330 Ohm resistors.
Would you happen to know if any of these work?

4

Hi @jdhchow

I would stick the 1kOhm resistors from D0 and D1 to 3.3V.

Also do you know if your gyro is a 3.3V compatible device? The I2C pins are 5V tolerant but you may need to power your gyro from +5V.

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5

Yes, the gyro is 3.3v compatible.

You mentioned the ports D0 and D1, are they able to read analog data or just digital?

6

Spark has built-in I2C on pins D0 and D1. They are digital pins (which is what I2C uses).

http://docs.spark.io/hardware/#pins-and-i-o-i2c

7

Thanks a million!
It worked perfectly!
Would it be better though to get 4.7k resistors?

8

The 1kOhms are fine. You can go to high resistances if you want to be say battery powered.

Glad it worked for you!

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9

Okay, perfect!

Thanks again for all your help!

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