AVR-Chat

Hi guys,

Is there another 8051 chip that can replace the DS5000T chip from Dallas ? I want to construct a Real-time controlled AC relays published in 'Reynolds' website (http://www.rentron.com/Project5.htm ) for my fish tank but upon checking the price of the DS5000T MCU, I was shocked. It is priced at about USD73.00 per piece in Singapore. Too much for me to swallow.

I was thinking, since the DS5000T is from the 8051 family, I am not sure whether are there any equivalents say, from ATMEL. Or, if any of you know of a similar project (the MCU must control at least 2 relays preferably, 4) but is using a different MCU. I've some stock (commonly use types though) on both PICs and AVRs. I've some DS1307 (Real-time clock from Dallas) too. There is another 8051 project from Reynolds using ATMEL AT89C2051 but it is actually an alarm clock. I think I can modifiy the circuit to control a relay but I do not know how to add codes to use another PIN for another relay.

Many thanks in advance.
Davis

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techy fellow wrote:

>Hi guys,
>
>Is there another 8051 chip that can replace the DS5000T chip from Dallas ? I 
>want to construct a Real-time controlled AC relays published in 'Reynolds' 
>website (http://www.rentron.com/Project5.htm ) for my fish tank but upon 
>checking the price of the DS5000T MCU, I was shocked. It is priced at about 
>USD73.00 per piece in Singapore. Too much for me to swallow.
>
>I was thinking, since the DS5000T is from the 8051 family, I am not sure whether 
>are there any equivalents say, from ATMEL. Or, if any of you know of a similar 
>project (the MCU must control at least 2 relays preferably, 4) but is using a 
>different MCU. I've some stock (commonly use types though) on both PICs 
>and AVRs. I've some DS1307 (Real-time clock from Dallas) too. There is another 
>8051 project from Reynolds using ATMEL AT89C2051 but it is actually an alarm 
>clock. I think I can modifiy the circuit to control a relay but I do not know 
>how to add codes to use another PIN for another relay.
>
>Many thanks in advance.
>Davis
>
>  
>

avr 8515 or atmega8515 or atmega162 is pin compatable with standard 8051 
chips

what about ds80c320 or dsc80c420
http://www.maxim-ic.com/MaximProducts/Microcontrollers/HighSpeed.htm

Atmel has quite a few 8051's
see  http://www.atmel.com/dyn/products/devices.asp?family_id=604
http://www.atmel.com/products/8051/

If the at89s2051/4051 has enough pins

for a few other 8051 projects
http://members.optushome.com.au/donmck/vicuni/
http://www.8052.com/tutorial.phtml
http://www.8052.com/codelib.phtml

have you had a look at the app notes from a few of the manufacturers ?
intel  
http://developer.intel.com/design/mcs51/index.htm?iid=ipp_embed+micro_51_251&
http://search.intel.com/corporate/search.asp?category=ALL&SearchCrit=ALL&mh=200&isoCode=en&MimeType=ALL&version=2.0&q1=8051+application+notes&x=0&y=0
atmel  http://www.atmel.com/dyn/products/app_notes.asp?family_id=604
dallas   http://www.maxim-ic.com/an_prodline2.cfm/prodline/25
  http://www.maxim-ic.com/solutions.cfm/cpk/63/pl_pk/0/ln/en/more/an
etc

http://www.kmitl.ac.th/~kswichit/
http://alds.stts.edu/APPNOTE/INDEX.HTM

also worth looking at
Myke Predko's Programming and Customising 8051Microcontroller
http://www.myke.com/8051book.htm

Alex

Hi,
 
As I'm new to electronics, I do not know how to test a logic analyzer. I bought a used 'Meguro' logic analyzer and it does not comes with user guide and the neccessary cables. I think the cable is just normal cable (eg. Hard-disk flat cable) and a test pin attached at the end of it.
 
The unit performed the self-test successfully upon powered up but, someone told me that does not mean the logic analyzer is working. If anyone can teach me how to test it, that will be great.
 
My logic analyzer (model: MLA-3300) has the following connectors/ switches behind the box.
- Check (looks like a headphone socket)
- VAR Adj Threshhold (looks like a POT)
- VAR <-> TTL (switch)
- DC Input (socket). Not sure why it is there since it allows AC input.
- AC socket
 
On its side, there is a 20 Pins male connector. I've made a cable using those hard-disk colored flat cable. On one end, I attached the cable to a 20 pins (female) connector and at the other end, I soldered test clips (different colored; spring type) to each strand of the cable.

Thanks in advance for the help.
 
cheers,
Davis



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techy fellow wrote:

> Hi,
>  
> As I'm new to electronics, I do not know how to test a logic analyzer. I bought a used 'Meguro' logic analyzer and it does not comes with user guide and the neccessary cables. I think the cable is just normal cable (eg. Hard-disk flat cable) and a test pin attached at the end of it.
>  
> The unit performed the self-test successfully upon powered up but, someone told me that does not mean the logic analyzer is working. If anyone can teach me how to test it, that will be great.
>  
> My logic analyzer (model: MLA-3300) has the following connectors/ switches behind the box.
> - Check (looks like a headphone socket)
> - VAR Adj Threshhold (looks like a POT)
> - VAR <-> TTL (switch)
> - DC Input (socket). Not sure why it is there since it allows AC input.
> - AC socket
>  
> On its side, there is a 20 Pins male connector. I've made a cable using those hard-disk colored flat cable. On one end, I attached the cable to a 20 pins (female) connector and at the other end, I soldered test clips (different colored; spring type) to each strand of the cable.
> 
> Thanks in advance for the help.
>  
> cheers,
> Davis

Should see if you can track down a manual,
but may find the manual isn't that helpful.

Any idea on the specs ?

To start with
You need a voltage source( 0-5volts should do) and some links.

Depends on the analyser settings.
If possible set to 5v or 10 v range.
Seen some having input voltage settings, others without.

Attach a wire to the voltage source (set to 2v)
with logic analyser on touch the wire to each input
and check the display shows the input you have connected 5v
to going high.

Do this to all the inputs.

Next you need a signal generator for.
Set it to square or sine wave.

Basically same again except start the sig gen
at a low frequency and check every input
then increase the frequency and go again.

Just change the logic analyser settings to match the
frequency.

Could try 1Hz, 1KHz, 100KHz, 1MHz, 10MHz, 20MHz
up to the max input frequency.

If you don't know the specs you can use this way to
work max input frequency out.

Someone else has probably got a easier/better way
but this should work.

Alex

Hi Alex,
 
Thanks for the detailed steps. I'll try them out. I am blessed because Meguro has mailed me a hard-copy of the user manual. They do it out of Goodwill.
 
cheers,
Davis

Alex Gibson <alxx@alxx.net> wrote:
techy fellow wrote:

> Hi,
>  
> As I'm new to electronics, I do not know how to test a logic analyzer. I bought a used 'Meguro' logic analyzer and it does not comes with user guide and the neccessary cables. I think the cable is just normal cable (eg. Hard-disk flat cable) and a test pin attached at the end of it.
>  
> The unit performed the self-test successfully upon powered up but, someone told me that does not mean the logic analyzer is working. If anyone can teach me how to test it, that will be great.
>  
> My logic analyzer (model: MLA-3300) has the following connectors/ switches behind the box.
> - Check (looks like a headphone socket)
> - VAR Adj Threshhold (looks like a POT)
> - VAR <-> TTL (switch)
> - DC Input (socket). Not sure why it is there since it allows AC input.
> - AC socket
>  
> On its side, there is a 20 Pins male connector. I've made a cable using those hard-disk colored flat cable. On one end, I attached the cable to a 20 pins (female) connector and at the other end, I soldered test clips (different colored; spring type) to each strand of the cable.
> 
> Thanks in advance for the help.
>  
> cheers,
> Davis

Should see if you can track down a manual,
but may find the manual isn't that helpful.

Any idea on the specs ?

To start with
You need a voltage source( 0-5volts should do) and some links.

Depends on the analyser settings.
If possible set to 5v or 10 v range.
Seen some having input voltage settings, others without.

Attach a wire to the voltage source (set to 2v)
with logic analyser on touch the wire to each input
and check the display shows the input you have connected 5v
to going high.

Do this to all the inputs.

Next you need a signal generator for.
Set it to square or sine wave.

Basically same again except start the sig gen
at a low frequency and check every input
then increase the frequency and go again.

Just change the logic analyser settings to match the
frequency.

Could try 1Hz, 1KHz, 100KHz, 1MHz, 10MHz, 20MHz
up to the max input frequency.

If you don't know the specs you can use this way to
work max input frequency out.

Someone else has probably got a easier/better way
but this should work.

Alex


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