Hattusa Pulse

[F117]

Instead of using an I2C IO expander 8574 + 2x16 char LCD,
why not simply attach an I2C OLED display ?
Cheaper, simpler, less old-fashioned and more creative...
eg
https://www.amazon.com.be/-/en/Ardui...df_B0BNHSGC63Z

When you insist on using the LCD, do you really need the IO expander? I can see some unused and "reserve" spare pins on the processor.

[ivconic]

Instead of using an I2C IO expander 8574 + 2x16 char LCD,
why not simply attach an I2C OLED display ?
Cheaper, simpler, less old-fashioned and more creative...
eg
https://www.amazon.com.be/-/en/Ardui...df_B0BNHSGC63Z

When you insist on using the LCD, do you really need the IO expander? I can see some unused and "reserve" spare pins on the processor.

I think it is due Proteus simulation, in reality I think it is not the case.
Yes anything that have I2C can be served as output.
I have few of those displays, but those are too small... or I am too old and my sight is getting worse.
Anyway; good idea, for those with good sight.

[jeep6789]

I don't understand the power connection method of lf353, so its total voltage value is only 7v?

[jeep6789]

Should we use a chip with low voltage drop instead of 7085, because it has a voltage drop of 2v, and then opamp 5v, 12v and gnd, they seem to have some problems with the opamp voltage

[ivconic]

I don't understand the power connection method of lf353, so its total voltage value is only 7v?

12v.

[ivconic]

This is my proposal for the final schematic.
Last jeep6789 remark is making sense, so I offered better solution.
Instead of MT3608 any other step-up DC/DC can be used, relating the current override.
Although; I've been using MT3608 modules for quite long time on various devices and I noticed that those are pretty durable and resistant.
I think MT3608 will do the job just fine in "Changed" version too.

[jeep6789]

good

[jeep6789]

Another question is, since we use hco5 to communicate with mobile phones, why do we need so many buttons and display screens? Can't we operate on mobile phones

[Hattusa]

hi;
Apparently I didn't explain to you what I wanted to do. Because my problem is not to use a nice analog structure. Besides, this analog build isn't spectacular, I know. I don't want to discredit the atmega328p that I use here. what I mean by old architecture is due to some restrictions...
Actually, I'm not an arduino guy. I don't use arduino in most of my projects. I use arduino in my urgent and fast works or tests. for him in this detector.

When it came to the 16x2 screen, I had this in my hand, so I used it. I have a 2.8 inch nextion in my hand. There were various screens close to 100, I did not use it. but no oled screen...

The reason why I use the mt3608 in the supply is a high operating frequency, it is a complete nuisance in PI detectors because converter ICs such as LM2577, MC34063a work at low frequencies such as 100-150 kHz. they cannot be used. The reason is that in N channel MOSFET drives in PI detectors, the gnd point of the signal is the + volt part of the battery. It's the same in the diagram I gave, but in the first opamp, we provide the signal with 220K gain, while at the same time we carry the GND point of the signal. such as delta pulse, xr71,dbp2010 etc detectors.


@ivconik I printed and drilled my PCB board. Sorry for the buttons. HOWEVER ; We can think of this card as a test card. If our members like the project, I will take your suggestions into account in the corrections section of the 2nd version. I apologize for not being able to consider your suggestions for the time being.

[Hattusa]

I want to talk about the parallel resistance to the coil on the TX floor while I am laying the PCB board on the one hand. As far as I've seen in the forums, they think that this resistor is related to the correction of the end point of the damping curve. I think it's incomplete information. This resistor corrects the signal, but there is another point to be considered, and it is necessary to take into account its effect on the detection depth.
Especially if we want to make the device different and have a large depth, we should choose this resistor well. Because this is very important for an error-free separation.

[Hattusa]

Another question is, since we use hco5 to communicate with mobile phones, why do we need so many buttons and display screens? Can't we operate on mobile phones

So that your novice friends will not have difficulties when they do the project, otherwise the calculation works are quite fast and easy on android, in fact, the atmega328p on the card only needs to generate the signal and send the value of the channels to android via bluetooth, the rest would be the job of the android program. and it would be fine.

[jeep6789]

So that your novice friends will not have difficulties when they do the project, otherwise the calculation works are quite fast and easy on android, in fact, the atmega328p on the card only needs to generate the signal and send the value of the channels to android via bluetooth, the rest would be the job of the android program. and it would be fine.

This is a project that everyone likes and we look forward to its brilliant achievements. As for other things, I have sent you an email and look forward to discussing with you about other projects

[ivconic]

[Hattusa]

This is a project that everyone likes and we look forward to its brilliant achievements. As for other things, I have sent you an email and look forward to discussing with you about other projects

I don't have any concerns for the project, the important thing is to find time and finalize it. I did not receive the e-mail you said you sent me.

[Hattusa]

probably i have a problem with damping and gain resistor, i need to set it from the beginning. But overall the code works