is it possible to giving pins a name, alias?
//Arrays input/output pins:
int outPin[] = {22,24,26,28,30,32,34,36};
int inPin[] = {5,6,7,8,9,10,11,12};
define?
Thanks
Not sure what you want.
#define tom 10
#define dick 11
#define harry 12
byte outPin[] = {tom, dick, harry};
1 Like
LCD display still sees 5,6,22,23
#define A 5
#define B 6
#define C 22
#define D 23
byte outPin[] = {C, D};
byte inPin[] = {A, B};
LCD ?
You obviously know exactly what this is all about.
We don’t.
Please explain a lot more than you have.
I am running pin loop on display, I prefer not to see loop pin# 5,6,22,23
I want to give it a name than pin# or the loop start out #1 instead 22 (#2 = 23)
Show your code.
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
//Arrays to set which pins are outputs and which are inputs:
#define A 1
#define B 2
#define C 3
#define D 4
byte outPin[] = {C, D};
byte inPin[] = {A, B};
int pin_size = 2;
int loop_count = 0;
int voltage;
void setup() {
lcd.init();
lcd.backlight();
//initialize the digital pin as an output or input:
pinMode((byte)outPin, OUTPUT);
pinMode((byte)inPin, INPUT);
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 0);
lcd.print("checking pin...");
delay(1000);
lcd.clear();
}
void loop() {
// Send the outputs.
digitalWrite(outPin[loop_count], HIGH);
delay(100);
digitalWrite(outPin[loop_count], LOW);
delay(100);
// Receive the inputs:
voltage = digitalRead(inPin[loop_count]);
lcd.print ("WIRE " + String(inPin[loop_count]) + ": ");
// LCD prints PASS or FAIL status using a switch statement:
switch (voltage) {
case HIGH:
lcd.print("PASS");
break;
case LOW:
lcd.print("FAIL");
break;
default:
lcd.print("SHORT?");
}
// Delay and increment the loop counter for the next set of pins.
delay(1000);
loop_count++;
lcd.clear();
// Check if reached the end of all pins.
if (loop_count == pin_size) {
lcd.print ("Test Completed");
delay(2000);
lcd.clear();
lcd.print("Testing again...");
delay(1000);
lcd.clear();
loop_count = 0;
}
}
byte outPin[] = {C, D};
. . .
for(byte x = 0; x < 2; x++)
{
pinMode(output(x), OUTPUT);
}
It is not straight forward; you can use a lookup table in some form (below used a struct that associates a pin number with a name). Code provided to demonstrate. Enter a number in serial monitor and it will show you the name (if found).
struct LOOKUP
{
const uint8_t pinNo;
const char *text;
};
LOOKUP inputPinNames[] =
{
{5, "A"},
{6, "B"},
};
LOOKUP outputPinNames[] =
{
{22, "C"},
{23, "D"},
};
void setup()
{
Serial.begin(115200);
}
void loop()
{
if (Serial.available())
{
int x = Serial.parseInt();
for (uint8_t cnt = 0; cnt < sizeof(inputPinNames) / sizeof(inputPinNames[0]); cnt++)
{
if (inputPinNames[cnt].pinNo == x)
{
Serial.println(inputPinNames[cnt].text);
}
}
for (uint8_t cnt = 0; cnt < sizeof(outputPinNames) / sizeof(outputPinNames[0]); cnt++)
{
if (outputPinNames[cnt].pinNo == x)
{
Serial.println(outputPinNames[cnt].text);
}
}
}
}
'output' was not declared in this scope
#define C 22
#define D 23
byte outPin[] = {C, D};
int inPin[] = {5, 6};
int pin_size = 2;
int loop_count = 0;
int voltage;
void setup() {
lcd.init();
lcd.backlight();
//initialize the digital pin as an output or input:
pinMode((int)inPin, INPUT);
for(byte x = 0; x < 2; x++)
{
pinMode(output(x), OUTPUT);
}
won't run your code, nothing show up in serial monitor
Sorry, spelling mistake.
byte outPin[] = {C, D};
. . .
for(byte x = 0; x < 2; x++)
{
pinMode(outPin(x), OUTPUT);
}
Set baudrate correctly to 115200.
Set line ending to newline.
That's my default. btw, I need that display on LCD though.
something still not right:
'outPin' cannot be used as a function
#define C 22
#define D 23
byte outPin[] = {C, D};
int inPin[] = {5, 6};
int pin_size = 2;
int loop_count = 0;
int voltage;
void setup() {
lcd.init();
lcd.backlight();
//initialize the digital pin as an output or input:
pinMode((int)inPin, INPUT);
byte outPin[] = {C, D};
for(byte x = 0; x < 2; x++)
{
pinMode(outPin(x), OUTPUT);
}
DAMN it is way too late, too many mistakes going to sleep 
This should should be:
byte outPin[] = {C, D};
. . .
for(byte x = 0; x < 2; x++)
{
pinMode(outPin[x], OUTPUT);
}
able to upload sketch but pin still showing 5,6 not C, D.
go sleep Larry, thanks for your help.
gnite 
It's abig difference if you want to give your pins a name to be used in your sketch ( as Larry did ), or if you want to give the pins a name that can be printed in the sketch ( no matter on LCD or serial monitor ).
Usage of the pin names in the sketch should be always done. It is not advised to use magic numbers in the sketch.
Pin names to be printed in the sketch is rarely used. @sterretje showed how this can be done.
Understood, thanks everyone for helping me. At least i know now. Am still wondering how this guy can do this.
// Create a Data Structure for each USB type
// Sensor Number , Pin Number, Status, Text description of pin and function
struct usbCleft {
byte pinnumber; // 62 to 69, 14 to 29 sensor pin addresses
char* function; // Text description of function and logical pin number
byte refnum; // Position of pin in rightside or leftside array
}
usbCleft[24] = {
{ 46,"A1 GND",0},
{ 48,"A2 TX1+",1},
{ 50,"A3 TX1-",2},
{ 52,"A4 vBUS",3},
{ 14,"A5 CC1",4},
{ 15,"A6 D+",5},
{ 16,"A7 D-",6},
{ 17,"A8 SBU1",7},
{ 18,"A9 vBUS",8},
{ 19,"A10 RX2-",9},
{ 20,"A11 RX2+",10},
{ 21,"A12 GND",11},
{ 22,"B1 GND",12},
{ 24,"B2 TX2+",13},
{ 26,"B3 TX2-",14},
{ 28,"B4 vBUS",15},
{ 30,"B5 CC2",16},
{ 32,"B6 D+",17},
{ 34,"B7 D-",18},
{ 36,"B8 SBU2",19},
{ 38,"B9 vBUS",20},
{ 40,"B10 RX1-",21},
{ 42,"B11 RX1+",22},
{ 44,"B12 GND",23}
};
struct usbCright {
byte pinnumber; // 30 to 53 sensor pin addresses
char* function; // Text description of function and logical pin number
byte refnum; // Position of pin in rightside or leftside array
}
usbCright[24] = {
{51,"GND A1",0},
{49,"TX1+ A2",1},
{47,"TX1- A3",2},
{45,"vBUS A4",3},
{62,"CC1 A5",4},
{63,"D+ A6",5},
{64,"D- A7",6},
{65,"SBU1 A8",7},
{66,"vBUS A9",8},
{67,"RX2- A10",9},
{68,"RX2+ A11",10},
{69,"GND A12",11},
{23,"GND B1",12},
{25,"TX2+ B2",13},
{27,"TX2- B3",14},
{29,"vBUS B4",15},
{31,"CC2 B5",16},
{33,"D+ B6",17},
{35,"D- B7",18},
{37,"SBU2 B8",19},
{39,"vBUS B9",20},
{41,"RX1- B10",21},
{43,"RX1+ B11",22},
{53,"GND B12",23}
};
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