Pinpointer with discrimination "Cat-FM" on ATMega328P

[void118]

do you take away a curiosity? the buzzer at what voltage do you feed it? yours should work at 5v, mine that I have at home are at 12v, now I would not want you to feed your buzzer at a higher voltage because if so it is right that it sounds very loud, while mine which is at 12v sounds normal
p.s. i use passive piezo buzzers

Piezo buzzer can work with 12V PWM without problem and resistor connected In parallel to buzzer Is because the buzzer you can think as capacitor.

[useus]

Hi friends, It's very strange for me, I'm using this one buzzer https://aliexpress.ru/item/32817425949.html
and It Is very loud.

do you take away a curiosity? the buzzer at what voltage do you feed it? yours should work at 5v, mine that I have at home are at 12v, now I would not want you to feed your buzzer at a higher voltage because if so it is right that it sounds very loud, while mine which is at 12v sounds normal
p.s. i use passive piezo buzzers

[void118]

Sound

I think I understand, I think you are trying to use simple speaker Instead PIEZO buzzer!? the speaker will work realy quietly, just replace It to Passive PIEZO buzzer and you will be pleasantly suprised.

[void118]

Hi friends, It's very strange for me, I'm using this one buzzer https://aliexpress.ru/item/32817425949.html
and It Is very loud.

[void118]

Void118, what value should the LOCK BIT be programmed to ? is it 00.

Hi, don't touch It please)

[MartyJ1963]

Thanks Useus. It's a shame it can't be redesigned with a different audio section,,,I think it's quite good at detection and I have been looking for a decent Pinpointer project for more than a year. Regards, Marty.

[useus]

Could we lower the 2 x 1k resistors in the audio section? Would that raise the volume? Thanks, Marty.

the 1k resistor going to atmega328 cannot be replaced.
the resistance in parallel with the buzzer I have already tried to replace it with a lower value to theoretically lower the ohm of the buzzer (tried 470-100-47-10) but the result does not change.
I think it is due to the internal resistance of the buzzer, I give an example, my buzzer is 47 ohm,
void118's is probably lower than mine and yours, so it sounds louder

[MartyJ1963]

Could we lower the 2 x 1k resistors in the audio section? Would that raise the volume? Thanks, Marty.

[MartyJ1963]

Thanks for the reply Useus. I hope we can find something suitable. Regards, Marty.

[useus]

Can I use an 8 Ohm speaker with this? The piezo is very low volume and I can hardly hear it. Thanks, Marty.

I am not the only one who has this problem then, unfortunately I believe that void118 is not available to modify the code to be able to use a transistor npn drive, both the pcb and the source should be revised.
the operating mode of the buzzer on the cat-fm is different and particular compared to the other metal detector schemes

to be sure of correct operation, you should use the exact same buzzer that the creator uses

[MartyJ1963]

Can I use an 8 Ohm speaker with this? The piezo is very low volume and I can hardly hear it. Thanks, Marty.

[void118]

Hi friends,

yesterday I speak with my brother and he told me that he will help to translate my video to English, he was born In England and I think you will get nice manual to my project.

[MartyJ1963]

Hi all, I ended up building a 'High Voltage Rescue Shield' that connects to the Arduino Uno. Glad I did because it rescued 4 x ATmega328P-PU's for me so I didn't have to buy anymore. They all programmed successfully after that. If anyone wants a copy of the Sprint layout I re-drew for it I'll post it here. I built my coil for the CAT FM V1.2 last night so I'll be assembling it all later now I have working ATmega's. Thanks again for the project Void118. Regards, Marty.

[MartyJ1963]

That's fine Bruce. Thanks for the help, much appreciated. Regards, Marty.

[6666]

@Bruce. Thanks for the help. I have an Arduino Uno board. Could you put me the steps I have to do to use the Uno, USBasp and Extreme burner please? I've programmed chips for the Felezjoo, Pickini and other projects in the past but I don't know if it's my programmer board that's playing up or if the chips are bricked etc? I made a new programmer board layout last night in sprint but haven't printed or etched it yet so I could try your method first. Thanks, Marty.

Hi Marty I will reply via email if thats ok.