need help on adc0808

[plotoyee]

hai everybody....
im now using the adc0808 to convert the human voice into the digital form. but there is no output shown?? why??
where is the problem??
thanks for ur help

 

[Sebi]

The output 8bits go to microcontroller...

 

[plotoyee]

yes im using basic stamp 2
but is not the bs2 problem.
the adc will give me all output high although i didnt put any signal in..

 

[Nigel Goodwin]

yes im using basic stamp 2
but is not the bs2 problem.
the adc will give me all output high although i didnt put any signal in..

What are you using for the clock signal?.

Also, you appear to have it wired to continually convert, as you are using a micro-controller you should use a signal from that to initiate a conversion, and wait for the end of conversion signal.

 

[plotoyee]

7k
because i need it to convert sound signal
so it need to operate all the time...

 

[Nigel Goodwin]

7k
because i need it to convert sound signal
so it need to operate all the time...

So how does the uP know when a new sample is ready?, you only have the eight data connections shown.

 

[plotoyee]

i program the bs so that it can direcly decode the input and producing the require output. but now im facing the problem in converting the huamn voice into digital form.....

 

[nasa]

information

I[/b][/quote]I AM USING ADC0808 BUT IT GIVES ALL OUT PUTS HIGH WITH0UT GIVING ANY INPUT

 

[williB]

two things..
1) the 0808 has no sample & hold circuit built in.. so you may want to use a different ADC.. or add one yourself..
2) as Nigel tried to tell you the interrupt ( or EOC ) is supposed to tell the uController when the conversion is done..

 

[jbeng]

yes im using basic stamp 2. but is not the bs2 problem.

Just curious ... Does the BS2 actually run fast enough to handle 7K samples/sec?
JB

 

[Nigel Goodwin]

yes im using basic stamp 2. but is not the bs2 problem.

Just curious ... Does the BS2 actually run fast enough to handle 7K samples/sec?
JB

I wouldn't have thought so, nor has it anywhere to store the data?.

 

[dzakriel]

sorry for interupting the discussion
but mr plotoyee, i also need adc0808 for my task.

did you ground all the 7bit other input so that you only get 1 from those that will converted?

i still confuse about how to using it

 

[ericgibbs]

sorry for interupting the discussion
but mr plotoyee, i also need adc0808 for my task.

did you ground all the 7bit other input so that you only get 1 from those that will converted?

i still confuse about how to using it

hi,
This thread is 5 years old.!

If you start a new thread, members will help.

 

[arzoo]

Interfacing of adc0808 with microcontroller

Hi guys,
the adc0808 is 8 bit adc with 8 multiplexed channels for analog signals.
its interfacing with microcontroller 8051 is very simple and easy, you can find code and other tips here on this link.
**broken link removed**