<< 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

Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
Got questions? Join the online conversation and get instant answers!
Jobilize.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