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Re: [Paparazzi-devel] Trouble getting SHT75 working with new Umarim lite

From: Prof. Dr.-Ing. Heinrich Warmers
Subject: Re: [Paparazzi-devel] Trouble getting SHT75 working with new Umarim lite v2 board
Date: Sun, 12 Aug 2012 22:36:00 +0200
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Hi Tim,
please look to the repository of the user Christoph  Niemann. We have used the TWOG  and TINY1.3  ( planes Funjet and Busca)  about 5-7/2011 and used free analogue  pins.
If the UMARIN has free pins you can use them.
Every  free  GIO-Pin is possible.
Perhebs you can solder small wires to processor pads.


Bonin, Tim A. schrieb:
Thanks Heinrich!  By using the manual and redefining the pins, was able to get it working.

I was able to get it working in the I2C1 slot on the Umarim lite v2.  However, once the SHT 75 was working properly, the IMU unfortunately stopped working.  It looks like the IMU and the I2C1 port share the same SDA and SCL pins.  Is there any way to use the I2C1 port while keeping the IMU working properly?  Otherwise, it seems odd to have an I2C1 port if it can't be used...

I'd like to use the I2C1 slot and leave the ADC (AUX) ports open for additional sensors.  But for now, the ADC port with a 10k pull-up will be fine. 


Warmers, Heinrich wrote:

>Hi Tim,
>you have to change the used processor pins.
>The protocol is a bit banging type (not i2c).
>You have to change the current  clock and data protocol and change the
>used pins of the processor.
>Please read the documentation (Phillips UM10139) of the lpc2148 to know
>how to program a pin as output (clock) and as input output and tristate
>for the data line. You have only to change the pin definition. But
>sometimes there are other register words used for different pins.
>So sometimes the macros im paparazzi code can fail.
>Bonin, Tim A. schrieb:
>> I recently switched over to a Umarim lite board, but am having trouble
>> integrating the SHT75 into it.  I'm trying to use the humid_sht module
>> to read in the data.  Since there is no ADC1 port on the Umarim lite,
> I've tried a few things, including redefining the pins in the header
>> files to the AUX1 and AUX 2 pins (pins 45 and 39, I think) and
> plugging the SHT75 into the AUX port, or by defining the pins in the
>> header file as SDA1 and SCL1 (pins 41 and 37) and plugging the SHT
> into the I2C1 port.
> >
> Either way, the messages from the SHT show a temperature of -39.66 and
>> 0.1 humidity, which would indicate that its not getting a signal.  Am
> I assigning the wrong pins, or maybe doing something else wrong?

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