Why doesn't this work on a Nano?
pinMode(7, INPUT_PULLUP);
When I check pin 7 (D4?), it's near Zero volts.
After sketch upload or reset, and with no setup, loop statements or functions that change the state of pin-7, the pin sits at 0 volts.
If I add an external 15k resistor to pin7 tied to 5V, pin-7 IS nearly 5V.
Is this Nano dead ??
This
pinMode(7, INPUT_PULLUP);
turns on the internal pullup to D7. Not D4.
On a Nano, D7 is pin 7. I think you are checking the wrong pin.
I used this:pinMode(7, INPUT_PULLUP);
After an upload or reset, pin 7 is at 0V.
It appears Nano's internal resistor is not 'connected' ????
ardocman:
After sketch upload or reset, and with no setup, loop statements or functions that change the state of pin-7, the pin sits at 0 volts.
Yes. All digital pins default to INPUT.
ardocman:
I used this: pinMode(7, INPUT_PULLUP);
"Used" how? Did you put it in a sketch? Where in the sketch? Did the sketch upload correctly? What else is in the sketch?
I uploaded this sketch to an Arduino UNO (same processor as the Nano) and Pin 7 reads 5.10V on my multimeter:
void setup()
{
pinMode(7, INPUT_PULLUP);
}
void loop() {}
D4 is physical pin 7 on the board. Ignore that.
It is pin 4 on the code. Use what is printed on the board
┌──...──┐
TX 1 │ ... │ 30 VIN
RX 2 │ │ 29 GND
RST 3 │ │ 28 RST
GND 4 │ │ 27 5V
D2 5 │ │ 26 A7
D3 6 │ │ 25 A6
[color=red][b]D4 7[/b][/color] │ │ 24 A5
D5 8 │ │ 23 A4
D6 9 │ │ 22 A3
D7 10 │ │ 21 A2
D8 11 │ │ 20 A1
D9 12 │ │ 19 A0
D10 13 │ │ 18 AREF
D11 14 │ ┌───┐ │ 17 3V3
D12 15 │ │USB│ │ 16 D13
└─┤ ├─┘
└───┘