Programmer Circuit | Electronic Project Circuits

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Central Heating Programmer with serial PC interface

This programmer has been designed for use with a domestic heating boiler. It provides outputs via two relays to control the supply of Hot Water and Heating. There are 10 program entries available and each one can control the heating and water independently. The programmer allows manual advance of the heating and water and disabling of program control, useful if you’re going away for a few days and want to leave the heating and water off. As well as providing normal front panel switch control of the heating and water, the programmer also features a serial terminal interface that allows it to be operated remotely from a PC running a Terminal Emulator.

Read Source: http://picprojects.org.uk/projects/chc/chprgrammer.htm

Be the first to comment - What do you think? Posted by admin - June 7, 2009 at 11:15 am

Categories: Microcontroller Tags: programmer circuit, rs232 interface, serial PC interface

JDM Programmer Modification by COM1

The JDM (or Ludipipo) seems to be among the most popular PIC programmers used – and rightly so: it is simple, cheap and easy to build, can be run with the free and excellent IC Prog software by Bonny Gijzen, and will program pretty much any PIC microcontroller on the market. However, an issue has arisen lately with some of the new PIC’s, eg PIC12F675, 12F629, and some others with an internal oscillator. When these chips are programmed the first time, everything goes fine. However, if you later try to read or re-write to them, they read as blank and cannot be written to. The problem only occurs when the PIC has been programmed for INTOSC and MCLR_OFF, but even in this situation sometimes it will re-program OK – there seems to be some other dependence on the program which has been loaded as well.

Read More Source:http://users.tpg.com.au/btkelly/jdm_b.htm
Thank you.