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I2C sendsor connection 
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Joined: Fri Aug 03, 2012 11:39 am
Posts: 5
Location: Ulm, Germany
Hello Folks,

I was connecting a Gyroscope and an Accelerometer via i2c to the BLE112 modul. I got all data from the Sensors i needed, but i didnt got them in the right speed. The clockfrequency is limited to 20kHz which limits my listeningfrequence to 10-12 Hz for 6 values with each 2 byte length plus the 3-4 calling bytes and the 3-4 answering bytes. This is far too less for a motion analyses. Because of that i changed my sensors to UART Sensors.

I was using the for the i2c connection
and now i am using the ... cts_id=221 for UART.

If you have some questions to the i2c and UART connectoin please ask... Maybe i can help...


Mon Aug 20, 2012 10:04 am
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Joined: Thu Aug 02, 2012 11:36 am
Posts: 166
Hi Armin,
I was thinking of using the SPI to UART bridge in one of my projects, so use SPI instead of I2C or UART directly
I ordered this boards from spark fun:

But I have not yet written a line of code to communicate with this board.

I will soon try to access the SHT15 and SHT21 as I mentioned in the forum post earlier.


Mon Aug 20, 2012 11:34 am
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Joined: Fri Aug 03, 2012 11:39 am
Posts: 5
Location: Ulm, Germany
Hello michael,

i was also thinking about this way of trying to connect my sensor this way. But in my case i think the CHR-6d sensor is much better. I can broadcast it and just wait for the data. With the memcpy function i collect the data in two buffers(double buffer mode) und write them to the GATT when the buffer is full. It seems very easy, but it was a lot of "try and error" work until i got to this point. Now i try to write my own BLEGUI application. I try with Visual studio my first steps in C#. Its cool work but it seems an endless reading in the documentations form bluegiga.



Tue Aug 21, 2012 11:56 am

Joined: Thu Oct 18, 2012 6:00 am
Posts: 8

Is your I2C code available anywhere? I'm attempting to interface a BMP085 pressure sensor and don't want to recreate too many solved problems if I can help it.


Wed Nov 14, 2012 12:52 am

Joined: Thu Oct 18, 2012 6:00 am
Posts: 8
For anyone else wondering, attached is the example from BlueGiga for the humidity sensor.


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Thu Nov 15, 2012 5:52 pm

Joined: Wed Dec 19, 2012 11:50 pm
Posts: 1
Hey all,

I've already posted something like this in the comments here:, but I thought I should also put it here to formalize everything.

I’ve made a post about using the BLE112′s I2C functionality here: ... o-use-i2c/

In addition, I've spoken with some of the BlueGiga people, and apparently the BLE113 should be coming out in Q1 and it will support hardware I2C.

Tue Jan 08, 2013 12:22 am
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