IDX-PRO+VDI

[Wiltran]

hello

i have seen vdi board at silverdogs shop
he wrote it can be adapted to igsl/tgsl
but how
is there any conection sheme out
can be that this vdi board is connected for all units same way but i dont know how

or can it be connected to original musketeer???

thx for any answer

regards

Check Ivconics post #194

[silverdog]

You must calculate the value of the resistor so that a fully charged battery at the entrance of the processor (pin 2) is 3.1738 volts, if VDD is exactly 5.000 volts

Apologies for a dumb question
If I put kits together what range of resistors should I supply for R2 ?

[hugo]

Hi Holyuser,
What do you think about using one or several ports RA5/RA6/RA7 of the VDI µP to drive an audio stage ?
In exemple :
- below 0; all outputs set to zero.
- between 0 and 10 : RA5 set to 1
- between 11 and 30 : RA5 and RA6 set to 1
- etc ...
With a BCD decoder, you can even have up to 8 command lines ... meaning 8 differents tones !

It will be fine if the user can choose the number of thresholds and the values of them.

But it's just an idea ...

[holyuser]

Hi Holyuser,
What do you think about using one or several ports RA5/RA6/RA7 of the VDI µP to drive an audio stage ?
In exemple :
- below 0; all outputs set to zero.
- between 0 and 10 : RA5 set to 1
- between 11 and 30 : RA5 and RA6 set to 1
- etc ...
With a BCD decoder, you can even have up to 8 command lines ... meaning 8 differents tones !

It will be fine if the user can choose the number of thresholds and the values of them.

But it's just an idea ...

Hi Hugo,
- RA5 is input only, not possible to be used as output;
- RA6 and RA7 are reserved for external crystal resonator;
- RB0 is left free to be used for sound or TX drive, but that will be possible if PIC runs at 16 or 20 MHz.

[hugo]

@Holyuser :
I don't know the mode the µP is running but in INTIO2 mode OSC1 & OSC2 can be become RA6 & RA7 working both as digital I/O.

[holyuser]

in INTIO2 mode OSC1 & OSC2 can be become RA6 & RA7 working both as digital I/O.

I mean, that RA6 & RA7 are reserved in my project, not generally.
There is resonator connected in my PCB - look picture at post #19

[hugo]

@Holyuser :
Ok, I understand.
So, I will say it differently ... Can we imagine a special version of the VDI, closed to the original schematic (without an external oscillator), able to pilot the audio ?

I mean, that RA6 & RA7 are reserved in my project, not generally.

What do you have into your brain ?

[holyuser]

Apologies for a dumb question
If I put kits together what range of resistors should I supply for R2 ?

Value of R2 depends of battery type, Vdd and R1 precision.
You can calculate it using the equation:

, where:

Vbat - is voltage of the fresh battery used (in Volts);
Vdd - is microcontroller voltage supply (in Volts);
R1 - in kOhms

In example, if You fresh battery is 12,6V and Vdd is exactly 5,0V and R1 = 20 kOm, then Your R2 must be:



You can use in this case 6,8 kOhm resistor, I think...

[silverdog]

Apologies, more dumb questions

I guess if your R2 value is incorrect the only consequence is inaccurate battery display ?

Could you explain the formula in steps I can't see how you get 6.7K from those values

On the Schematic there is no value for C1

[holyuser]

I guess if your R2 value is incorrect the only consequence is inaccurate battery display ?

Yeah, right!

Could you explain the formula in steps I can't see how you get 6.7K from those values

In the present example, would be like that:

1. we must firstly calculate 1024x12,6=12902,4 and 650x5=3250 ;
2. in the next step we find 12902,4/3250=3,97 (approximately) ;
3. next, we can find denominator as 3,97-1=2,97
4. finaly we divide 20 by 2,97 and voila! 20/2,97=6,734 (approximately)

On the Schematic there is no value for C1

This question is not to me, because that C1 is not part of VDI, but...
I think, that something about 1nF would be good.
In my opinion, this capacitor is used to reduce the influence of cable.

[Uykusuz]

Hi to all

This link is my new vlf project. I used atmega8 microcontroller.
http://www.lugatek.com/forum/index.p...sg1416#msg1416

For only video:
http://www.youtube.com/watch?v=5CAqCVR03KE

I will share all documets of this project very soon too.

[holyuser]

[Wiltran]

Thanks Holyuser!

[eduardo1979]

Thanks Holyuser!

[eduardo1979]

VDI+HEX

Here is all.