[Tinyos-help] how to read analogue input on telosb (T-Mote Sky)?

[Ákos Maróy]

Jan.

> What hardware (MCU, sensor) are you using ? - if you are reading
> temperature, then there obviously should not be such spikes, so it
> looks like there is a problem with reading data from the sensor. I
> just re-ran Oscilloscope for all external sensors on telos and it
> worked fine. Can you try this:
> 1) increase the sample-hold-time (sht parameter of
> msp430adc12_channel_config_t) - the exact value can be calculated
> using a formula found in the "MSP430 User's Guide", for testing try to
> gradually increase it. If this does not work, try:

I tried this, but to no avail.. :( basically the readings get lower as I
increase the sample hold time, but the spikes still remain..

> 2) open tinyos-2.x/tos/chips/msp430/adc12/Msp430Adc12.h and comment
> out "ADC12_P6PIN_AUTO_CONFIGURE". Now the Ax PINs are not
> automatically configured, so you should (e.g. in Boot.booted()), do
> this:
> 
> call Port61.selectModuleFunc();
> call Port61.makeInput();
> 
> (in your configuration:
>   components HplMsp430GeneralIOC;
>   MyDriverC.Port61 -> HplMsp430GeneralIOC.Port61;)

I'm not sure I understand - should I create a new driver myself? Based
on an existing module?


Akos