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13 Feb 2011

Many AVR microcontrollers are capable of doing Analogue to Digital Conversion. The ATmega168 has 6 ports (8 ports on the SMD packages) that can be used for analogue input. This tutorial shows you how.

Analogue to Digital Conversion on an ATmega168 - [Link]

9 Feb 2011

rsdio presents: MAX11209/MAX11211, ultra-low-power, high-resolution, serial-output ADCs. [via]

  • Pin-compatible versions of the 24-/20-/16-bit family
  • Low 150µA supply current is ideal for portable sensors
  • Includes four GPIOs that can be used for external mux control
  • When used with the specified data rates, the internal digital filter provides more than 100dB rejection of 50Hz or 60Hz line noise

MAX11209/MAX11211 18-Bit, ultra-low power, delta-sigma ADCs – [Link]

9 Feb 2011

Here’s a circuit by Joe Desbonnet’s Random Tech Stuff that’s designed to monitor battery voltage. It uses one resistor, one diode (or LED), one microcontroller ADC input and one digital output. [via]

PIC 12F675 battery monitor using a diode/LED and resistor – [Link]

17 Jan 2011

This project shows how to measure the power supply of your micro-controller that can be very important and critical, specially for battery powered applications. The solution the author explains in this short tutorial don’t need any external components, for all the AVR micro controllers that have an internal ADC. As an example in this article, we are going to use an ATMEGA48 micro controller.

AVR: Monitor power supply voltage, for free! – [Link]

12 Dec 2010

This article discuss what the AREF pin is, how it works and why you may want to use it. AREF pin is the analog voltage reference pin and used when using an analog-to-digital converter. AREF is set according to the measuring signal. [via]

Tutorial: Arduino and the AREF pin – [Link]

12 Nov 2010

Analog to digital conversion are required in embedded systems because most of their surroundings comprise of analog signals and the embedded processors can process only digital data. This tutorial shows how to use the internal ADC module of a PIC microcontroller to read an external analog signal and convert it to a digital number. The conversion output will be displayed in a character LCD.

Tutorial on Analog to Digital conversion using PIC - [Link]

11 Nov 2010

This project is a digital TouchClock that uses your own handwriting to display the time and days in a graphical LCD. You enter the numbers and day names on the configuration mode and the clock is using them to display the info. It uses a 128×64 BLUE/WHITE TOUCHSCREEN GLCD from CircuitED and the ADCs on a PIC18 microcontroller to translate the X and Y coordinates of touchscreen. [via]

TouchClock : Design your own GLCD Clock – [Link]

22 Oct 2010

This project describes how to make a digital voltmeter using a PIC microcontroller. A HD44780 based character LCD is used to display the measured voltage. The PIC microconotroller used in this project is PIC16F688 that has 12 I/O pins out of which 8 can serve as analog input channels for the in-built 10-bit ADC. The voltage to be measured is fed to one of the 8 analog channels. The reference voltage for AD conversion is chosen to be the supply voltage Vdd (+5 V). A resistor divider network is used at the input end to map the range of input voltage to the ADC input voltage range (0-5 V). The technique is demonstrated for input voltage ranging from 0-20 V, but it can be extended further with proper selection of resistors and doing the math described below.

PIC16F688 Digital Voltmeter - [Link]

5 Oct 2010

This is a digital voltmeter project that uses PIC12F683 to measure the input voltage and displays it on LCD. It uses a resistor divider network to measure input voltage ranging from 0-20V. Full 10-bit resolution is used for internal ADC for higher accuracy. The firmware is written in mikroC and available for free.

0-20V Digital Voltmeter using PIC12F683 - [Link]

1 Sep 2010

This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The circuit employs the ADC (Analogue to Digital Converter) I.C. CL7107 made by INTERSIL.

Led display digital Voltmeter – [Link]





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