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Help needed after PIC16F1938 replacement #atu-100 #photo-notice

 

Hello All
Last October, I purchased via Etsy ATU-100 mini from S51PV. It arrived and I turned it On, saw the unit was working and I put it in my drawer. It came in without a case and without antenna ports. Couple of weeks back, I decided to put the ATU to use and soldered the antenna connectors. I inadvertently, supplied 12v to the button pin which obviously damaged the PIC chip - at least this is what I suspected.
Since then I have replaced the PIC16F1938 chip and flashed it multiple times - but the display shows the attached characters. Is there something else that would have got damaged which I need to replace?
I tried to search a lot but cannot find any answer.
73
de VU2TUM
Puneit Singh

1602 display.jpg

 

Hi have you programmed the pic to tell it what display it is using, as in the manual,
Dave 2E0DMB?

On Sun, 9 Jun 2024, 13:39 Puneit Singh via , <vu2tum=[email protected]> wrote:
Hello All
Last October, I purchased via Etsy ATU-100 mini from S51PV. It arrived and I turned it On, saw the unit was working and I put it in my drawer. It came in without a case and without antenna ports. Couple of weeks back, I decided to put the ATU to use and soldered the antenna connectors. I inadvertently, supplied 12v to the button pin which obviously damaged the PIC chip - at least this is what I suspected.
Since then I have replaced the PIC16F1938 chip and flashed it multiple times - but the display shows the attached characters. Is there something else that would have got damaged which I need to replace?
I tried to search a lot but cannot find any answer.
73
de VU2TUM
Puneit Singh
 

Dear Dave,
Yes, it is using the default display, i.e. 4E. The display driver I have is PCF8574T and as per the manual it's address is 4E, which is also default.
Upon powering on, I do hear a click - I think one of the relays get triggered. Button press does nothing.
73
VU2TUM.
 

Try to set the unit to test mode ( press tune bypass an auto, all 3, simultaneously on power on), check the relay operation.
?That will let you confirm firmware an hardware functionality (*pressing auto and bypass you increase or decrease C or L values).?

The display may be damaged by 12V passing via pic. Replace it.

73

Paulo PY1JDX?

Em dom., 9 de jun. de 2024 10:14, Puneit Singh via <vu2tum=[email protected]> escreveu:

Dear Dave,
Yes, it is using the default display, i.e. 4E. The display driver I have is PCF8574T and as per the manual it's address is 4E, which is also default.
Upon powering on, I do hear a click - I think one of the relays get triggered. Button press does nothing.
73
VU2TUM.





 

Dear Paulo
While my board only has one button, I looked at the schematic and found the auto and bypass pins at 27, 26. I grounded these two pins and shorted the button using a jumper and then plugged in power supply. Now, I hear many relays clicking during startup and the screen becomes blank. Afterwards, shorting either of the pins (27,28) don't give any aural indication that relays are clicking. I am placing an order for 0.96" OLED SSD1306 display - it should arrive in a few days. I will let you know how it goes.
73
VU2TUM
 

Hi there Puneit!

Good news.

Yes, as you have decided,? the first thing to do is to change OLED Display.
Since the relays are switching up and down it's a good indication that the firmware and hardware are good.

First of all check?the EEPROM data in Cell 00 and 01 .?
I've had a problem with my second ATU (N7DDC) kit on those values.

Bellow is a portion of the PDF document: ATU-100_Extended_Board_User_Manual_eng_*** ()

" 00 ¡ª I2C address setting cell of the connected display.The port extension board for?
display 1602 made on the PCF8574AT chip has the address 7E, on the chip with the ¡°T¡± index - 4E.?
OLED displays usually have an address of 78 or 7A.
?It is allowed to record any address in the cell for normal operation with the connected I2C device.?
The default value is 4E, which corresponds to the LCD display 1602 with an extension board with the PCF8574T chip.
01 ¡ª cell to indicate the type of display connected.A value of 00 corresponds to a connected two-color LED.?
Value 01 - 1602 LCD with port extension card.
Value 02 - OLED display 128 * 32, 03 - OLED display 128 * 32, an inverted image.?
Value 04 - OLED display 128 * 64, 05 - OLED display 128 * 64, an inverted image.Attention! Work with displays other than those described above is not provided by the device."
The default values did not work in my case.

Greetings from Rio de Janeiro, Brazil!
73

Paulo de Tarso - PY1JDX
?



Em dom., 9 de jun. de 2024 11:12, Puneit Singh via <vu2tum=[email protected]> escreveu:

Dear Paulo
While my board only has one button, I looked at the schematic and found the auto and bypass pins at 27, 26. I grounded these two pins and shorted the button using a jumper and then plugged in power supply. Now, I hear many relays clicking during startup and the screen becomes blank. Afterwards, shorting either of the pins (27,28) don't give any aural indication that relays are clicking. I am placing an order for 0.96" OLED SSD1306 display - it should arrive in a few days. I will let you know how it goes.
73
VU2TUM
 

Dear All

I changed the display and now the board is working fine. Since, I am missing the two buttons bypass and auto on the PCB, are these buttons needed - if yes, I can pull jumpers from under side of the pcb and add these buttons.

Thanks a lot for everything so far :-)

73
Puneit
VU2TUM
 

Thanks for letting us know
Thanks Dave 2E0DMB


On Wed, 12 Jun 2024, 15:36 Puneit Singh via , <vu2tum=[email protected]> wrote:
Dear All

I changed the display and now the board is working fine. Since, I am missing the two buttons bypass and auto on the PCB, are these buttons needed - if yes, I can pull jumpers from under side of the pcb and add these buttons.

Thanks a lot for everything so far :-)?

73
Puneit
VU2TUM
 

Thanks for the feedback ??
73

Em qua., 12 de jun. de 2024 11:36, Puneit Singh via <vu2tum=[email protected]> escreveu:

Dear All

I changed the display and now the board is working fine. Since, I am missing the two buttons bypass and auto on the PCB, are these buttons needed - if yes, I can pull jumpers from under side of the pcb and add these buttons.

Thanks a lot for everything so far :-)?

73
Puneit
VU2TUM

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