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Step 36Build the controller: Connect the ICs, 8bit bus + OE
In the picture, you'll notice a lot of wires have come into place.
All the tiny blue wires make up the 8+1bit bus that connects all the latch ICs. 8 bits are for data, and the +1 bit is the output enable line.
At the top of the board, we have added a 16 pin connector. This connects the latch board to the micro controller board. Next to that, you see the 74HC138.
The tiny blue wires are Kynar wire. This is a 30 or 32 AWG (american wire gauge) wire. Very tiny. We love working with this type of wire. Because it is so thin, it doesn't take up that much space on the circuit board. If we had used thicker wire, you wouldn't be able to see the board through all the wires. Kynar wire is coated with tin, so you can solder directly after stripping it. No need for pre-tinning. The tiny blue wires are connected to the same pin on every latch IC.
From the connector at the top, you can see 8 green wires connected to the bus. This is the 8 bit data bus. We used different colors for different functions to better visualize how the circuit is built.
The orange wire connected to the bus is the output enable (OE) line.
On the right hand side of the connector, the first pin is connected to ground.
All the tiny blue wires make up the 8+1bit bus that connects all the latch ICs. 8 bits are for data, and the +1 bit is the output enable line.
At the top of the board, we have added a 16 pin connector. This connects the latch board to the micro controller board. Next to that, you see the 74HC138.
The tiny blue wires are Kynar wire. This is a 30 or 32 AWG (american wire gauge) wire. Very tiny. We love working with this type of wire. Because it is so thin, it doesn't take up that much space on the circuit board. If we had used thicker wire, you wouldn't be able to see the board through all the wires. Kynar wire is coated with tin, so you can solder directly after stripping it. No need for pre-tinning. The tiny blue wires are connected to the same pin on every latch IC.
From the connector at the top, you can see 8 green wires connected to the bus. This is the 8 bit data bus. We used different colors for different functions to better visualize how the circuit is built.
The orange wire connected to the bus is the output enable (OE) line.
On the right hand side of the connector, the first pin is connected to ground.
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I dont think the schematic and the picture are the same. from looking at back side of board. The 3 blue wires are correct pins 3,4,5, and the orange wire (OE) is pin 6. But the schematic I think shows pin 7 as D7, and pin 8 is D6, pin 9 is d5 an so forth.
But if you go by the pictures and the datasheet for 74hc574n, pin 7 is d0 (it looks to be soldered to the next higher to the orange, pin 8 is d1, pin 9 is d2 and so forth.
Which should i follow
For wire with a PVC (or similar) jacket, you can 1) use your thumbnail to pinch and pull off the insulation 2) use a pair of needle nose pliers to do the same (carefully), or 3) use your soldering iron (if you have good ventilation and fume control, that is).