PICKINI V4 - an easy to build, self adjusting PI detector

[BC547]

Better without auto correction:
An alternative would be to place the 3 x 18650 in parallel and connect a cheap upconverter that can be adjusted to 12V.
And a 5V USB C charger.
Something like this: adjust the output voltage to whatever you want
https://www.amazon.com.be/-/nl/Step-up-voedingsadapter-Arduino-Raspberry-projecten/dp/B06ZYYC99S/ref=sr_1_18?crid=2X70L277N7P5J

The main argument to not to use an upconverter would be switching noise.

[BC547]

I always used a batterij pack of 3 x18650 in series.
This gives you in theory 3 x 3.7 V = 11.1V.

An alternative would be tobput thé 3 x 18650 in parallel and connect a cheap upconverter that can be adjudted tot 5V.
And a 5V USB C charger.

[MDfanatic]

BC547 would it be better if the Pickini was powered with 3 x 18650 or by 4 x 18650?

[BC547]

Alpi : you've got mail.

You may have noticed that I removed the "Shop" page from my website for 2 reasons:
1 / I am running out of 16F1824 and they are phasing out
2a / I used to send every kit/controller via normal post mail. Not via DHL or other courier. In some countries, the normal mail proved to be "not so trustworthy" to put it mildly and some kits got lost in transit...
2b / I don' have enough spare time to assemble these kits and put them into the mail anymore...

You can still obtain the 16F1824 online.
Then try to find somebody who has a PicKit3 progrmammer ( or buy one ) and download the hex file from my website: http://www.willaert.world/MD/software/v4/Pickini4.1.hex

[Alpi]

Hi Bernhard
Can I buy a microchip from you the 16F1824 with program pickini v4 for contact [email protected]

[sbalio1]

Ok.kt315

[kt315]

Hi friend i try lm709 it works but the same problem sensivity decreassed

you use obsolete and slowlest opamp in the world. it has 0.25V/us slew rate, just, compare with LF357 having 50V/us.

[Reedick]

Hi friend i try lm709 it works but the same problem sensivity decreassed

[BC547]

The coil resistance should not be 0 ohms, rather 0.5 ohms or more. This is just a check if the coil is not shorted = 0 ohm.
But then you would get the 'coil error sound' = no flyback pulses detected.

To put evertything on a timeline - please correct me if this is wrong:

- you have built this PCB, connected a coil and everything worked fine ? Normal detection sensitivity ?
- some time later, the sensitivity has decreased ?

Can you check on pin 3 of the PIC16F1824 if the sensitivity setting is changing between 0 and 5V when you turn the sensitivity potmeter ?
Also check the capacitor that is in parallel with the 1M feedback resistor of the opamp LM318. It should not be more than 4.7 pF.
You can even remove this capacitor.

Also check all DC voltages with a multimeter on each pin of the microcontroller and the opamp:
The reference voltages are here:

http://www.willaert.world/MD/pickini_en/V4/electronics.html

[Reedick]

Friend can you give me detail for coil. 30cm diameter ohm and mh.
30cm=????ohm

20cm=???? Ohm

[Reedick]

Hi friend ihave detect sound but after that sensivity decreased. . This may image. Pcb

https://www8.0zz0.com/2023/10/02/18/123883535.jpg

https://www8.0zz0.com/2023/10/02/18/521168270.jpg

https://www8.0zz0.com/2023/10/02/18/656630694.jpg

[BC547]

This is the correct link to the coil error sound:

http://www.willaert.world/MD/pickini...technical.html

[BC547]

Can you also check your coil : measure it with an ohm meter ?
Are you getting the startup sound and after that the idle sound ? Or the coil error sound ?

[Reedick]

Iwell chow you my pcb

[Reedick]

Hi F117 no it worked ok but sensivity coil decreased into . Detected nothing