VDI-RODERICO

[roderico]

ok very good, no problem, it would be good to see in the tests how the vdi changes with the soil, i.e. a test with an object in the air and the same or an identical object buried in the soil. If possible also a test with this version where the vdi is extracted from the histogram as the mean value. This version also shows an uncertainty estimated with the mean deviation (it can be hidden in the config menu). Big values of the deviation would indicate bad measurements of the vdi e.g. iron objects.

[kroman01]

I am happy with the operation of version 2.0, although I go to field tests myself
I will check version 2.1, I will write comments as soon as time permits

[roderico]

I found some bugs in the code and I updated the firmware to v2.1 if someone would like to give it a try, the changes w.r.t. version 2:

- fix width of integers in vdi limits
- set upper limit of minimum vdi to 90 for excluding also positive vdi values
- fix sampling ending before 400ms (only the first 200ms were used in v2.0)
- implement axis scaling in histogram view
- remove ticks at +/-45 degrees in histogram view (kroman01's idea)
- exclude vdi values from the saturation region in histogram view (you might need 2x scale to be similar to v2.0)

this version would be only for testing and check if it works better than previous one

[cvele]

I see, thank you Roderico!
Cvele

[roderico]

unfortunately it is not possible because pic16f628a does not have an analog-to-digital converter (ADC) module...

[cvele]

Here it is the version with the trigger delay adjustable in the configuration menu to set a faster response. To remove the delay as in the led version you need to set it to 0ms and to recover the previous version value you need to set the delay to 500ms. This version also discards some cases where the sampling is incomplete and gives wrong vdi numbers (I'm using a 10k resistor between MCLR pin and Vdd in my vdi, however I haven't tested the firmware without the resistor while reducing the delay to 0).

Hi Roderico,
is it possible to replace 16f88 with 16f628a?
regard

[roderico]

looking at the original IDX schematic http://www.geotech1.com/forums/attac...7&d=1313926126 I saw that the problem spotted by kroman01 (different saturation levels of XY) is not present in the original design as it can be seen in the VDI connector (P12). Maybe someone would like to test it, i.e. instead of using RT2 and R9 it might work much better to use R47, R48, VR5 and C20 of the original schematic (below). This is something similar to the U3 input through VR2 which is not in the idx pcb...

[Nandor]

It work with any frequency detector.

[ricalbertvig]

Hello .. a query, this vdi can work with treasure wolf, frequency 17.5 khz?

[roderico]

this is the source code for version 2.0 released under the GPL license and including all the versions (LED, LCD and GLCD). I also backported the backlight control for PIC16F88/690 but the pcb is not backwards compatible anymore and it will not build with the XC8 compiler in free mode, so not recommended, consider PIC16F886 instead. PIC18Fxxxx firmwares can be built with the SDCC compiler but they are very slow compared with those of the Microchip XC8 compiler:

[kroman01]

my designed PCB for GLCD on PIC18F25K22

[ricalbertvig]

HELLO SOMEONE HAS DESIGN PCB LAY
HELLO SOMEONE HAS DESIGN PCB LAY

[sinko1]

it work good?

[roderico]

yes but I need some time first, did version B work for you?

[saba]

hello, I meant if you would share the code?