Smart Home Automation Forum

I have been trying to get the A1-A4 inputs working without success.

Working from this drawing: KC868-E16S schematic

I have found some errors:



I have marked up the errors in red.

A1/CHA1 is connected to R92
A2CHA2 is connected to R91
A3/CHA3 is connected to R83
A4/CHA4 is connected to R82

It seems that the labelling on the board connectors, shown below, is incorrect.



A1 is connected to GPIO36
A2 is connected to GPIO34
A3 is connected to GPIO35
A4 is connected to GPIO39


Input AA1 is connected to LM224 pin 12
Input AA2 is connected to LM224 pin 10
Input AA3 is connected to LM224 pin 5
Input AA4 is connected to LM224 pin 3

The component labelling of the board matches the corrections that I have made for you on the drawing.

Additionally, you will see that two of the zero ohm resistors on my board, R82 and R83 are open circuit, marked with an X.

Please can you tell me how this can be resolved and provide a link to a correct drawing for my board.

Please can you confirm which GPIO is connected to which Analogue input.

Thank you.

on Monday, when we begin work , will check and feedback to you.

(04-16-2023, 11:02 AM)admin Wrote: [ -> ]on Monday, when we begin work , will check and feedback to you.

Thank you.

ANALOG_A1 GPIO36
ANALOG_A2 GPIO35
ANALOG_A3 GPIO34
ANALOG_A4 GPIO39

these pin define is right.
PCB print label need exhange:
A1->A4, A2->A3,A3->A2,A4->A1

(04-17-2023, 12:41 AM)admin Wrote: [ -> ]ANALOG_A1  GPIO36
ANALOG_A2  GPIO35
ANALOG_A3  GPIO34
ANALOG_A4  GPIO39

these pin define is right.
PCB print label need exhange:
A1->A4, A2->A3,A3->A2,A4->A1

Thank you.

What do I do about the open circuit zero ohm resistors?

i can't see clearly in your photo, two red mart on PCB is no resistance?

(04-17-2023, 08:10 AM)admin Wrote: [ -> ]
i can't see clearly in your photo, two red mart on PCB is no resistance?

I have marked both the photo and drawing. What is not clear?

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The two zero ohm resistors are open circuit.

can you take a HD photo of these two resistance (red region mark).