Shift registers

[Andrew Cowan]

I have had a fun day learning to use shift registers - and here is the outcome.

A DS18B20 temperature sensor.
An 08M
Two 78hc595 Shift registers
Two 7 segment LED displays

I'm really pleased with how it turned out. Any questions?

Andrew

 

[testerrrs]

Have a play with a MAX7219. 8 Digit 7 Seg driver. Uses SPI but with a modified bitbang routine it's not hard to get working.

The thing is basically a 8x16bit shift register. Might be a worthwhile extension to your project.

Jon

 

[Mycroft2152]

Well done!

Another technique for the protoyping toolbox.

Myc

 

[tiscando]

stp16cl596b1rstp16c596m

A versatile shift reg - driver chip is also here: stp16cl596: parallel-out shift register current regulating LED sinking driver.

 

[marcos.placona]

Have a play with a MAX7219. 8 Digit 7 Seg driver. Uses SPI but with a modified bitbang routine it's not hard to get working.

The thing is basically a 8x16bit shift register. Might be a worthwhile extension to your project.

Jon

Indeed, the max7219 are real fun too. It's a bit complicated to get them working at first, but once you understand it well, it's piece of cake, and they are really powerful.

 

[westaust55]

Shift registers - Part 2

Hi Andrew,

Congratulations on getting your 74HC595 shift registers working.

If and when you want to transfer the data the other way, that is parallel in to serial out to get 8 inputs into a single PICAXE input, then have a look at the 74HC165. These work in the same way as the 74HC595's.

 

[steska]

one of mine proto-blocks, a 4 digit 7217

 

[Andrew Cowan]

Very neat!

 

[marcos.placona]

I can bet the back of it isn't as neat as the front

 

[Andrew Cowan]

That's the problem with veroboard. steska - what have you used for chip holders? Looks interesting (although hard to solder in). Do you have the chip inserted when you solder?

Thanks,

Andrew

 

[marcos.placona]

Even a custom PCB with 4 displays is a mess. You can't get it without two layers. At least I couldn't

 

[steska]

That's the problem with veroboard. steska - what have you used for chip holers? Looks interesting (although hard to solder in). Do you have the chipinserted when you solder?

Thanks,

Andrew

Those individual machine pins do come with holders.
Easy to run the wrap wire between individual pins or through the center.

If using the cheep sockets, I use he ones with slots, run a chainsaw file
along the bottom of the socket to cut a grove and run the wires through if needed.

 

[steska]

All the modules are wired at the top and taped over on the bottom.

 

[Andrew Cowan]

Do you have a problem of those machine pin holders acting as heatsinks when soldering? I would imagine they would make soldering harder.

Andrew

 

[marcos.placona]

All the modules are wired at the top and taped over on the bottom.

Well that's clever

 

[steska]

Do you have a problem of those machine pin holders acting as heatsinks when soldering? I would imagine they would make soldering harder.

Andrew

Absolutely none, also have some holders with plastic back that look like
a blind machine pin sockets.