VDI-RODERICO

[roderico]

how does your detector compare with the original idx in performance, e.g. in the fields?

[kroman01]

I don't need U6
another diagram with corrected errors
IDX_mod._kroman_2.pdf

[roderico]

if you need U6 to control the sound then the microcontroller might not work well because this part would need very low latency and the microcontroller needs to perform the analog to digital conversion first before any computation

[kroman01]

hello roderico is my working and proven design
IDX_mod._kroman.pdf

[roderico]

it might be possible but could you elaborate more on your schematics,e.g. the purpose of U6, have you already built a working prototype?etc.

[kroman01]

my concept of the analog part in which U6 may not be needed
IDX-CYFR..pdf

[roderico]

but I don't fully understand, what is your metal detector concept?

[kroman01]

hello roderico will there be a problem designing a completely new digital according to my metal detector concept

[SWL]

Roderico, thanks so much for the quick reply! Now everything is clear...

[roderico]

however, you would need R15 jumper because PIC16F886 firmware only works with a LCD display

[roderico]

hello, you don't need them because PIC16F886 already has an internal oscillator, these are only needed for old pics, e.g. PIC18F252 or to use a higher frequency clock (above 8MHz) but the firmware only works with 4MHz...

[SWL]

Hello! I ask you to clarify the scheme. Do I need to set Y1, C12, C13 when using PIC16F886? Thank!

[roderico]

the fix for the backlight could be something like in the attached file (R11 needs to be tuned with Q1 and the display)

[roderico]

You can use a switch between LedA to +5v or a pnp transistor switched by the micro.

this could be the best solution since it would work with all displays but it requires a new revision for the pcb (e.g. for v2.2), mine has the same pins

Don't know what it would look like in sunlight, but they are all over the place on ebay...

you can compare a mobile phone and a lcd watch in direct sunlight, the mobile backlight probably uses a lot of current and here it is limited to less than 100mA and the lcd does not need backlight

[Altra]

I'm not understanding the issues with backlights.

I don't think it is a problem my version has the backlight "K" soldered to ground and the led "A" is on the edge connector with a 34 ohm current limiting resistor mounted to the pcb. You can use a switch between LedA to +5v or a pnp transistor switched by the micro. Or just leave it disconnected.

Knowing Chinese stuff there may be multiple versions? Mine has 16 pins