LMT70EVM: Query comands (serial) for LMT70EVM

Hi Sandrino,

Let me look into this.

Kelvin

Thank you Kelvin! Any hint would be much appreciated. All we need to know is how to start/stop acquisition and read the received values. I suppose the values would come as a stream of (unsigned?) 16bit values representing the temperature in counts. To convert to volts we would need to know the input range of A/D converter. Once this is done I suppose we will need then take these values and convert them to temperature using LUT (or 2nd grade equation) but this would be the easy part.

Sandrino,

Since you want to bypass the LV GUI, I would recommend using a Launchpad like the MSP430F5529LP to sample the LMT70 analog output. Once you have that going you can easily use the Launchpad to interface with your GUI via a serial COM port. They have plenty of driver examples available for using the ADC with the Launchpad.

-Kelvin

Thank you very much Kevin for the suggestions. That is absolutely correct. We just can not use LV for such small projects. We will look into MSP430F5529LP. Otherwise we have plenty of high performance full blown 24bit DAQ modules to work with but we are still having some difficulties on consistently installing such a small capsule like LMT70 on the custom shape PCB we would like to use. Nevertheless, I believe we have figured out (sort of) the serial sequence to start / stop LMT70EVM and although we don't know why this done the way it is done I think for now we are good. I really like the fact that once started the LMT70EVAL keeps updating the port with fresh values so you don't have to send extra commands to query the value and all you have to do is read the last value from the serial buffer when you need it. Smart approach so you don't have to bother with synchronization. When you need it the latest available data is always there.