Hi everyone,
I am new with particle devices, and I bought one B SoM B524, designed a board all around it and now I am testing it, all seems to work fine excepts for the analog pin A3 (D16) looking at the documentation it is an analog/digital pin without special functions, when I try to read the pin it always output 0.
I am using analog pin A0, A1, A2 successfully with the same copy of the circuit connected to A3, so I don’t think it is a bad board design fault
.
The weird behavior is:
A3 connected to GND, output 0;
A3 floating, output 0; while ALL the other output pins have a value around 150/300;
A3 connected to 3.3V, ouput 4095;
To me seems a sort of “digital response” of the pin.
The code used to test it is as simple as possible:
SYSTEM_THREAD(ENABLED); /* multi-threading */
SYSTEM_MODE(SEMI_AUTOMATIC); /* auto-reconnect */
void loop() {
for(int i = 14; i < 22; i ++) {
Paint_DrawNum(0, 0, i, &Font24, BLACK, WHITE);
Paint_DrawNum(0, 24, analogRead(i), &Font24, BLACK, WHITE);
delay(1000);
Paint_DrawString_EN(0, 24, " ", &Font24, BLACK, WHITE);
}
}
Paint_… are just functions to display on a connected LCD through SPI.
There something I can try, or I have to assume that the pin is faulty?
Thanks to all