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

[BC547]

According to this datasheet of the BS170 from Fairchild - the orientation on your board seems ok:
http://www.farnell.com/datasheets/2164079.pdf

[BC547]

Right now, I'm hearing the opening tones when I connect 12 volts to the board and a continuing slow click, but nothing else.

After a while ( ~30s ) you should hear a continuous low tone = COIL ERROR when there is no flyback puls ( possibly caused by BS170 )

[BC547]

BS170 connections on my original schematic

http://users.telenet.be/willaert/MD/pickini/pics/v4/pickiniV4_schematic.png

D: R10 = 4k7
G: R21 = 10E
S: GND

[morganton]

Incorrect voltage on LM318 pin 5

I hooked my new board up tonight, but it's not detecting after connecting it to one of my PI coils. Here are my voltages at the pins for 16F1824 and LM318

16F1824:

Pin 1 --> 5.02
Pin 2 --> 1.79
Pin 3 --> 1.9
Pin 4 --> 5.02
Pin 5 --> 4.78
Pin 6 --> .01
Pin 7 --> 0
Pin 8 --> 3.94
Pin 9 --> 3.94
Pin 10 --> 1.79
Pin 12 --> 2.61
Pin 13 --> 1.52
Pin 14 --> 0

LM318:

Pin 1 --> 8.68
Pin 2 --> 7.73
Pin 3 --> 7.73
Pin 4 --> 0
Pin 5 --> 8.68 (should be 4.8V)
Pin 6 --> 7.83
Pin 7 --> 11.06
Pin 8 --> 1.37

I may be having the same problem that ripsdevala had--high voltage on pin 5 of the LM318 because of an improperly oriented BS170. I'm using a Fairfield BS170 that has a DGS pattern on the flat side. See photo below.

I have also attached a photo of my board with the flat side of the Fairfield BS170 pointing at the 2200uF cap. Should I change the orientation of the BS170 so the flat side faces away from the 2200uF cap? Or can someone tell me what is the proper order of D-G-S on the PCB?

Right now, I'm hearing the opening tones when I connect 12 volts to the board and a continuing slow click, but nothing else.

Thanks!

[morganton]

Eclipse, thanks so much for your post above about the PK2DeviceFile.dat substitution! Your post was very helpful.

If you are using the PICkit 2 programmer, as he noted, download his file and rename it PK2DeviceFile.dat in the directory Program Files (x86)\Microchip\PICkit 2 v2\

In the PICkit 2 software, choose "Device Family", then "Midrange" then "1.8V Min". The 16F1824 can then be chosen. You will also have to import the source code from F117's files to burn the PIC.


If you are using the Enhanced PICkit 2 as the programmer the connections to the 16F1824 pins are:

GND --> pin 14
PGC --> pin 12
PGD --> pin 13
VDT --> pin 1
VPP --> pin 4

If you place the PIC in the top of the ZIF socket, which is numbered 1 though 40, the corresponding numbers are:

GND --> slot 40
PGC --> slot 38
PGD --> slot 39
VDT --> slot 1
VPP --> slot 4


See below for a screenshot of the PICkit 2 software and some photos of the PICkit 2 set up for the 16F1824.

[ripsdevala]

Solved. Put 3R ntc or 2ohm resistor at boost converter output will solve the problem, i dont know if this will effect another function, but its seem normal...

[ripsdevala]

Unfortunately Li ion with 10R series resistor and switch is not working, first switch on, 2nd switch will off immediately.
I found NTC 3, 5 and 10R... seems work normal but no, the MD just make beep..beep continuously after auto tune tick, behave like its doesn't have enough power.

[geoscash1]

The LM318 is also upside down..
This looks like the very first version that Arionas made. There were several improvements since his first post.

I sometimes wonder why I went through all the trouble of providing a simple, fool-proof design, when the first thing that people do is make their own version of it and then complain it doesn't work.
Please have a look at the original documentation:

http://users.telenet.be/willaert/MD/pickini/pickini_en/V4/electronics.html

Thanks. It looks like what happened was I downloded the files from your website, then as the thread progressed downloaded the arionas files into another folder, both named similar. When i got around to workin on it opened and used the wrong set of files... well, it wont be tough to fix. Also i placed the socket for the 318 correctly, it wouldnt work the other way and that was easily noticed, just figured it was a pcb image mistake.

[BC547]

play with r8 r9. increase r9 and/or decrease r8.

This will only influence the trip point of the low battery detection by the PIC.
This is the point where the low battery tone is generated ( intermittent low sound ).
It will not help in limiting the inrush current upon battery connection.

[ripsdevala]

No, like this:

[ATTACH]37886[/ATTACH]

Set the switch over the resistor open.
Close the normal power switch.
Inrush current will be limited by the series resistor.
Wait for 3 seconds.
Then close the switch over the resistor.

Thanks for the knowledge mr.Bernard, eclipse...

[kt315]

play with r8 r9. increase r9 and/or decrease r8.

[BC547]

No, like this:



Set the switch over the resistor open.
Close the normal power switch.
Inrush current will be limited by the series resistor.
Wait for 3 seconds.
Then close the switch over the resistor.

[ripsdevala]

The implementation of a fixed resistor with a switch in parallel is easiest to implement.
Making the right choice for an NTC is probably more difficult.


Both methods - fixed resistor and NTC - are explained on wikipedia:
https://en.wikipedia.org/wiki/Inrush_current_limiter

Like this?

[BC547]

The implementation of a fixed resistor with a switch in parallel is easiest to implement.
Making the right choice for an NTC is probably more difficult.


Both methods - fixed resistor and NTC - are explained on wikipedia:

https://en.wikipedia.org/wiki/Inrush_current_limiter

[ripsdevala]

First time hear NTC, how is the setup?

Maybe the rush-in current on the 2 elcos on the 12V = 2200 microfarad + 470 microfarad is too large ?
Put an NTC thermistor in series ?

I've had this issue with too high capacitance and step up module, as Bernard says it's due to too high capacitance. A quick fix would be adding 10R / 2W resistor after the battery and switch parallel to the resistor.
You will then switch on the device as regular, then switch on the new switch (which will short out the resistor). A long term solution would be adding 10R-20R NTC as suggested.
XL6009 datasheet suggests soft-start function but I don't think it has one, or it's not functioning properly.

Let me try this, many thanks