<< Chapter < Page Chapter >> Page >
Using the eZ430-RF2500 Development Tool use ADC10 to perform a single temperature sample on channel A10 (on-chip temperature sensor) each minute during 1 hour.

Laboratory signal acquisition: lab1 - sar adc10 conversion

Introduction

This laboratory gives examples of the uses of the ADC types available in the hardware development kits. A different laboratory is developed for each kit, taking into account that both the ADC10 and the SD16_A laboratories implement a temperature data logger. The ADC12 laboratory also uses operational amplifiers to perform the analogue signal conditioning.

Overview

This laboratory ( Lab1_ADC.c ) implements a temperature data logger using the hardware kit’s integrated temperature sensor. The device is configured to perform an acquisition each minute for one hour. Each temperature’s (ºC) value is transferred to flash info memory segment B and C. When the microcontroller is not performing any task, it enters into low power mode.

Resources

The ADC10 module uses V REF+ = 1.5 V as the reference voltage.

It is necessary to configure the ADC10 to use the integrated temperature sensor (A10) as an input. Timer_A generates an interrupt once every second that starts conversion in the ADC10. At the end of a conversion, an interrupt is requested by the converter and the temperature value is written to flash memory.

The voltage value is converted into temperature following the equation provided in ADC10 section of the MSP430 User’s Guide<slau144e.pdf>. After transferring the value to the flash memory, the system returns to low power mode LPM3.

The resources used by the application are:

- ADC10;

- Timer_A;

- Ports I/O;

- Interrupts;

- Low power mode.

Software application organization

The application starts by stopping the Watchdog Timer.

The system checks for calibration constants on info memory segment A. The CPU execution will be trapped if it does not find this information.

Digitally controller oscillator (DCO) is set to 1 MHz, providing clock source for MCLK and SMCLK, while the Basic Clock System+ is configured to set ACLK to 1.5 kHz.

Controller’s flash timing is obtained from MCLK divided by three to comply with the device specifications.

Port P1.0 is configured as an output and will blink the once LED every second.

The ADC10 is configured to use the input channel corresponding to the on-chip temperature sensor (channel A10). The configuration includes the activation of the internal reference voltage V REF+ = 1.5 V and the selection of ADC10OSC as clock signal. The converter is configured to perform a single-channel single-conversion. At the end of conversion, an interrupt is requested.

The Timer_A is configured to generate an interrupt once every second. ACLK/8 is selected as the clock signal using the VLOCLK as clock source and will count until the TACCR0 value is reached (in up mode). The system then enters into low power mode and waits for an interrupt.

Flash memory pointers and interrupt counters are initialized. The Timer_A ISR increments the variable counter and when this variable reaches the value 60 (1 minute), the software start of conversion is requested. At the end of this ISR, the system returns to low power mode.

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Teaching and classroom laboratories based on the “ez430” and "experimenter's board" msp430 microcontroller platforms and code composer essentials. OpenStax CNX. May 19, 2009 Download for free at http://cnx.org/content/col10706/1.3
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Teaching and classroom laboratories based on the “ez430” and "experimenter's board" msp430 microcontroller platforms and code composer essentials' conversation and receive update notifications?

Ask