Matrix user forums

In the past 10-11 years a lot has changed in the world of electronics. Servos, Stepper Motors, Brush Less DC motors and Arduino computers etc. I never completed my PWM project because of the difficulty of providing overload/short circuit protection for the L293/L298 H bridges. There is now another ...

Further to my last post on this subject (25 April 2009) I have been doing some experiments and found the following:- If you take IN1 and IN2 through diodes to a pull down resistor and connect the EN1/2 terminal to this instead of the supply you can get the truth table below:- IN1 -- IN2 --- Functio...

The code given to stop multiple entry of keys traps the program in a loop. It is never a good idea to trap programs in a loop as they cannot do anything else until released. This code stops the multiple entry but does not trap the program in a loop. Delays do the same, it is better to use an interru...

Version 4 allows multiple keypads so the number of pads is only limited by the number of nibles (half bytes) available. ie. You can set up 48 keys (3 keypads) from 12 bits! :lol: The keypads are selected to the custom setting and an image added to the panel behind the keypad. This image is 120x120 p...

I think the Flowcode designers were trying to keep things simple with their various ‘Slave Service Macro Parameters’. :roll: Well, lets get a bit more complicated, 1. A string is an array of ASCII characters ie. an array of numbers. 2. An array of numbers is exactly that, an array of numbers. 3....

Have you got an old Parallel Port project that uses 8255 chips for Input/Output that is not used because you have no Parallel Port? :cry: Then read on, a 28 pin ECIO interfaces the computer USB port to the projects Parallel Port. It uses Port B & C so Port A is still free for other applications. :lo...

There is no need to wait for Flowcode V4 to implement a 4x4 keypad. The files in the link show, in detail, how to do it now. :lol: They also allow an LCD to be driven from the same port! The ‘Enable’ has been transferred to Port C although this can easily be changed to another Port in the ‘...

I have been measuring the transmit time for the USB Slave by using ‘GetTickCount’ or ‘TimeGetTime’ in the Delphi program IE:- StartT:= TimeGetTime; // or GetTickCount lRetVal := ECIO_Transmit(bDataOut,TxLen,@nTxDataCnt,bDataIn,32,@nRxDataCnt,50); EndT:= TimeGetTime; // or GetTickCount Som...

Hi I have just seen the article on ‘Controlling Motors with a Microcontroller’ and would like to point out the following:- Taking Motor A, if both IN1 & IN2 are both 0 or 1 this is a ‘Fast motor stop’. A ‘Slow motor stop’ or free running stop is where no voltage is applied to the moto...

Hi. I had trouble getting this to work. Here are the settings I ended up with, may be it will help some one. ο»ΏPICkit 2 Configurations etc - Target - 16F887 March 2009 8) Chip - Complier options These should be set automatically if you install Flowcode 3.6.11 and above with PICkit 2 option selected...