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PIC 5×7 display

PIC 5×7 display

You will need the 5×7 Display Project. It is available from Talking Electronics for 59.90 dollar plus 4.40 dollar pack and post.
While you are waiting for your kit to arrive (It is a same-day mail-out service but the mail may take 2-7 days for arrival) you can cover the programming section. There’s at least 3 days worth of study in this section and it’s all presented on the web with hyperlinks to each section. You can even go through the experiments before your kit arrives and become familiar with how the programmes are structured. It has been shown (Cocoa-Cola research) that it takes three exposures (of advertising) to get 90% acceptance. The first pass gathers 50 – 80%, the second pass increases this to 90% and the third pass brings retention to 95%.

With programming you have to be very near 100% if you don’t want too many mistakes in a program. If you have 5 mistakes in a 100 line program, it may take hours to trouble-shoot.

That’s why electronics is a “perfect science.” Things have to be “spot-on” for the project to work.

So, the more you study, the closer you will be to getting a program up-and-running the first time.

On some occasions a program has worked the first time. It’s most gratifying and the more you work on your theory, the more chance you have of getting a routine working. Not only that, increased experience enables you to create more-complex programs. So it’s benefit’s all around.

Without any more discussion, here are the steps:

Step 1: Read the Introduction chapter. It will take you to the Display Effects page where you can see some of the examples that can be created with this project.

Step 2: Read Construction-Part1 chapter. It covers the 5×7 Display section of the circuit including the PIC chip, the CD 4017 shift-chip, the switches and driver transistors.

Construction-Part2 chapter covers the In-Circuit programmer section of the circuit. These two circuits are combined on the PC board however they have been described separately to keep the diagrams simple. These two pages also describe the assembly of the PC board. You can build the whole project or just fit the first column of LEDs. The first 6 experiments require just the first column of LEDs and the other experiments require the whole screen.

Step 3: To make sure the project works correctly, we have produced a set of TEST PROGRAMS. These test the chips, the LEDs and the wiring to the components. They are intended for those who have built the project on their own board or “Matrix Board” and need diagnostic tests. They are not needed if you have put the project together from a kit as the “experiments” start you at the beginning of programming.

We do not recommend you build the project on Matrix Board as the added work in wiring up the components is considerable. We had to start in this way as no board was available but for the cost of a PC board, the final result is worth the cost. PC boards are available separately from Talking Electronics.

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