PIC Data Logger with Delta-Sigma Converter

The aim of the project is to build a lab-grade data logger with PIC18F45K20 microcontroller and a 20-bit delta-sigma converter. It's named as G5 Data Logger.

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AVR Shark Tag Project

The goal of this project was to develop a shark tag working bench-top microcontroller platform. It is to be used for on-animal, in-situ data logging applications involving sharks and potentially other large pelagic.

The project used the Atmel Mega32 microcontroller to develop the core platform and functionality of a data archival tag. The project use temperature and pressure as sensor variable. The tasks ranged from logging sensor data to developing a simple user interface that requires only the addition of a laptop and a custom RS232 serial cable in the field.

It used an off-the-shelf SD (Secure Digital) card using flash memory for large capacity multi-read/write data storage. The microcontroller’s ADCs (analog to digital converters) were used to convert analog voltages produced by select sensors into digital format.

Tag: Animal Tag, shark, data logging, avr project src

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ARM USB Data Acquisition

This project shows you how to build a simple data acquisition device around an LPC2138, ARM-based microcontroller. The system features a simple GUI that allows you to view graphed data instead of the streaming serial data in a terminal emulator session. In this project, Bruce gives example by collects temperature data from an analog temperature sensor and graphs it via a PC GUI.

Download
Source and PDF

tag : data acquisition, LPC2138, ARM microcontroller, project src

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AVR Project : SPI2CF - WLan For AVR

Till Harbaum has build a WLAN system, SPI2CF, which is small, simple and cheap. Using SPI2CF WLAN System you can leave much of the AVR functionality for other use and allowing fast and reliable WLAN data transfers. The final design was based on a prism chipset based compact flash WLAN card which is connected to the AVR CPU using a programmable logic chip (CPLD) made by Xilinx. Since the CF card is attached to the AVR using the SPI interface the entire system is named the SPI2CF project. You can get the complete compact flash specification from the Compact Flash Association.

The pros and cons of this solution presented here are:

Pros:

• Reliable CF data transfers
• Simple and easy SPI AVR interfacing
• Fast transfers with low cpu impact
• Homebrew friendly hard and software (all required tools are free of charge)
• Can be used for other compact flash cards as well
• Support for uip TCP/IP stack

Cons:

• Requires the ability to flash a CPLD
• Uses outdated WLAN hardware

Download : schematic, verilog source code, uip port

tag : AVR, Project, WLAN, Data Transfer, Wireless Project, Microcontroller Design (src)

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PIC Based GPS to SD-Card Data Logger

This project combines a GPS receiver module, a Microchip PIC microcontroller and a Secure Digital memory card to make a GPS data logger. With a large capacity and reasonably long battery life it is a very useful device for logging GPS position for example for mapping with OpenStreetMap.

The data from the GPS is logged every second with the raw NMEA sentences being written to the SD card. The data written to the card is the GSA, GGA, RMC and GSV sentences which by excluding the carriage returns this should never exceed 512 bytes per second. The data contains:

• GGA - 78 bytes - time, fix, lat, long, altitude, horizontal dilution of precision.
• GSA - 69 bytes - fix (none, 2D, 3D), satellites used, dilution of precision.
• RMC - 78 bytes - time, lat, long, speed, course, date.
• GSV - 74 bytes - satellite information (4 messages).

The total active power consumption is about 40mA to 45mA when active which in theory should give 48 hours on rechargeable batteries with 2000mAh capacity. In practice I have measured a time of 40 hours.

Download : schematic and source code

related serch : Microcontroller Circuit Project, GPS, SD Card, Data Logger, PIC (src)

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MICRF102 Based RF data logger

Telemetering is a methode to measure voltage, temperature or any other variable which long distance between censor and data processor. There are many ways to implement telemetering, one of them using wireless RF data logger. What do you need with this project is Rf transmitter, RF receiver and Data processor (PC) . Any number of these recorders transmits data packets to a central PC-based receiver. A PC program stores the information for later analysis.

The RF data logger project use small RF IC's the MICRF102 from Micrel because it's good compromize between price and complexity. The MICRF102 is a low power ASK transmitter IC. It generates UHF frequencies by PLL multiplying a crystal oscillator frequency by 32. In this case a 13,56MHz crystal provides a 433,925MHz carrier. The data recorder is controlled by a small AVR TINY45 microcontroller.

Download schematic RF transmitter (gif)
Download schematic RF receiver (gif)

[source]

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