Microcontroller - 8051, 8052, OpCodes, Analog Interface.
Showing posts with label pc-interface. Show all posts
Showing posts with label pc-interface. Show all posts

Sunday, February 15, 2015

The Micro Stop - RS232 microcontroller schematics

"These pages are a useful collection of microcontroller RS-232 data acquisition circuits and code. Most of the code on these pages is written in C because it is the language that is definitely the fastest way to produce working applications."

The Micro Stop - RS232 microcontroller schematics

DVM-001 voltmeter kit
RS232 controlled and RS232 powered DVM-001 voltmeter kit with PC voltage display. This circuit uses a PIC12F675 8-pin microcontroller with built-in analog to digital converter. The circuit also has an op amp and resistor divider network to achieve the 54vdc max input voltage.

RS232 serial tools

This  rs232 data monitor is a thoroughly field tested and reliable software tool for serial monitoring, troubleshooting and logging rs232 communication. A laptop PC and this com port monitor give you a powerful, portable and sturdy tool to aid in designing and logging rs232 data between peripherals and hosts.

RS232 serial tools

Monday, August 10, 2009

Lammert Bies - Computer Interfacing

Information about computers and how to interface them to all kind of equipment. Both software and hardware help is available. - Lammert Bies

Lammert Bies - Computer Interfacing

  • RS-232 specs
  • RS-485 information
  • The serial UART
  • USB interface
  • Modbus interface
  • Unitronics RJ11

Simple null modem without handshaking

Simple null modem without handshaking

"only the data lines and signal ground are cross connected in the null modem communication cable. All other pins have no connection. An example of such a null modem cable without handshaking can be seen in the figure below."

Monday, June 15, 2009

interfacebus.com - Interface and Cable design

Providing detailed electronic design information regarding Interface, Computer, Cable, Processor and Embedded Buses. - Leroy Davis

Buses used on Personal Computers, Computers & Peripherals, Standards, Wireless, Logic Design.
    interfacebus.com - Interface and Cable design

    The site is geared toward Engineers who develop or design equipment. There are 3 main sections; OEM Equipment / Components listings, Computer buses, and engineering design data.

    In this site you will find a wealth of knowledge regarding Analog and Digital Integrated Circuits; Memory, Processor and Programmable Logic IC's, Bus Interface IC's,  Passive, and Mechanical components; Resistors, Capacitors, Inductors and Sensors, EDA Software vendors,

    interfacebus.com - Interface and Cable design

    PCI104 Bus

    PCI-104 is the newest variation of the standard. PCI-104 removes the old PC XT / AT bus from the specification leaving only the PCI bus. The PCI bus connector is a 4x30, 2mm stack-through connector. PCI-104 cards may still reside in a stack with either PC/104 cards or PC/104-Plus cards.

    Saturday, February 17, 2007

    How to Use Your PC to Measure Temperature

    Thermocouple, RTD, Temperature monitoring is central to the majority of data acquisition systems, be it to save energy costs, increase safety, reduce testing time...whatever your reasons, you will need a device to measure the temperature - a temperature sensor.

    How to Use Your PC to Measure Temperature

    Thermocouples, resistance temperature devices (RTDs), thermistors and infrared thermometers are all types of temperature sensor. Which you choose depends on factors like your expected maximum and minimum temperatures, the accuracy you need and your environmental conditions.

    752-RTD: RTD Resistance Temperature Measurement, Digital I/O, Counting, Analog Output
    • Measure temperature using RTDs or Pt100 sensors, and voltage signals
    • With extra hardware monitor thermocouples and strain gauge bridges
    • Includes the powerful yet easy-to-use Windmill software for Windows: no programming required
    • Connect up to 8 USB units to one PC
    Here is a way you can learn, How To Interface PC to the Outside World.

    How to Use Your PC to Measure Temperature

    Temperature Control with a PC

    Based on the above the Octagon computes a sensible heating/cooling current value and transmits a corresponding analogue signal to the current control electronics in the TC-box.
    The current control electronics control the current provided by a big external power supply flowing through the peltier heating elements according to the signal received from the Octagon.

    delabs Notes

    This is a project that will help students learn both hardware and software aspects of a control system. Here you can test out an automation program on a PC with minimum external hardware.

    When you implement in the field, the system has to be a dedicated real time uC based product on custom firmware. Systems with OS + Software combination are not known to be reliable in Process Control. But OS + Software is good for Supervisory Systems which get their data from Real Time Controllers.

    So a front end controller must be Rugged, Non-PC based and Non-OS based unit. This means use something like a SBC. With a Robust and Compact (means fast) firmware.

    The firmware should be Polling or Interrupt based but with both internal and external watchdog. Most important a Power supply Management that resets system properly over Brown-outs and Black-outs. Even today some Embedded Systems i have to turn off and on after power resumes.

    Don't Forget, Multiple Watch Dogs and Multiple Power Management for graceful start of system !! Use one big SuperCap if you want. Else people will go back to Thermostats.