Hi everyone,
I'm using Sparkfun's code from the hookup guide (button-pad-hookup-guide). Now I'm trying to use the digitalWrite() function in the code but it is not working properly :
The red digitalWrite() function is not working properly : What I mean by this is that there is no voltage. The blue digitalWrite() function does work and I can measure a 5V output. I can't figure out why the red digitalWrite() function does not bring the A0 pin to 5V and was wondering if anyone here has the answer?
Thanks in advance!
/******************************************************************************
red-plus-buttons.ino
Byron Jacquot @ SparkFun Electronics
1/6/2015
Bas Gerritsen @ Canisius College
1/25/2018
*/
//config variables
#define NUM_LED_COLUMNS (4)
#define NUM_LED_ROWS (2)
#define NUM_BTN_COLUMNS (4)
#define NUM_BTN_ROWS (2)
#define NUM_COLORS (1)
#define MAX_DEBOUNCE (3)
// Global variables
static bool LED_buffer[NUM_LED_COLUMNS][NUM_LED_ROWS];
static const uint8_t btncolumnpins[NUM_BTN_COLUMNS] = {6, 7, 8, 9};
static const uint8_t btnrowpins[NUM_BTN_ROWS] = {2, 3};
static const uint8_t ledcolumnpins[NUM_LED_COLUMNS] = {10, 11, 12, 13};
static const uint8_t colorpins[NUM_LED_ROWS] = {4, 5};
static int8_t debounce_count[NUM_BTN_COLUMNS][NUM_BTN_ROWS];
static void setuppins()
{
uint8_t i;
// initialize
// select lines
// LED columns
for (i = 0; i < NUM_LED_COLUMNS; i++)
{
pinMode(ledcolumnpins[i], OUTPUT);
// with nothing selected by default
digitalWrite(ledcolumnpins[i], HIGH);
}
// button columns
for (i = 0; i < NUM_BTN_COLUMNS; i++)
{
pinMode(btncolumnpins[i], OUTPUT);
// with nothing selected by default
digitalWrite(btncolumnpins[i], HIGH);
}
// button row input lines
for (i = 0; i < NUM_BTN_ROWS; i++)
{
pinMode(btnrowpins[i], INPUT_PULLUP);
}
// LED drive lines
for (i = 0; i < NUM_LED_ROWS; i++)
{
pinMode(colorpins[i], OUTPUT);
digitalWrite(colorpins[i], LOW);
}
// Initialize the debounce counter array
for (uint8_t i = 0; i < NUM_BTN_COLUMNS; i++)
{
for (uint8_t j = 0; j < NUM_BTN_ROWS; j++)
{
debounce_count[i][j] = 0;
}
}
}
static void scan()
{
static uint8_t current = 0;
uint8_t val;
uint8_t i, j;
// Select current columns
digitalWrite(btncolumnpins[current], LOW);
digitalWrite(ledcolumnpins[current], LOW);
// output LED row values
for (i = 0; i < NUM_LED_ROWS; i++)
{
if (LED_buffer[current][i])
{
digitalWrite(colorpins[i], HIGH);
}
}
// pause a moment
delay(1);
// Read the button inputs
for ( j = 0; j < NUM_BTN_ROWS; j++)
{
val = digitalRead(btnrowpins[j]);
if (val == LOW)
{
// active low: val is low when btn is pressed
if ( debounce_count[current][j] < MAX_DEBOUNCE)
{
debounce_count[current][j]++;
if ( debounce_count[current][j] == MAX_DEBOUNCE )
{
Serial.print("Key Down ");
Serial.println((current * NUM_BTN_ROWS) + j);
for(int k =0; k < NUM_LED_COLUMNS ;k++){
for(int q =0; q < NUM_LED_ROWS ;q++){
LED_buffer[k][q] = 0;
}
}
// Do whatever you want to with the button press here:
[color=red]digitalWrite(A1, HIGH);[/color]
// toggle the current LED state
LED_buffer[current][j] = !LED_buffer[current][j];
}
}
}
else
{
// otherwise, button is released
if ( debounce_count[current][j] > 0)
{
debounce_count[current][j]--;
if ( debounce_count[current][j] == 0 )
{
Serial.print("Key Up ");
Serial.println((current * NUM_BTN_ROWS) + j);
// If you want to do something when a key is released, do it here:
}
}
}
}// for j = 0 to 3;
delay(1);
digitalWrite(btncolumnpins[current], HIGH);
digitalWrite(ledcolumnpins[current], HIGH);
for (i = 0; i < NUM_LED_ROWS; i++)
{
digitalWrite(colorpins[i], LOW);
}
current++;
if (current >= NUM_LED_COLUMNS)
{
current = 0;
}
}
void setup()
{
// put your setup code here, to run once:
Serial.begin(115200);
Serial.print("Starting Setup...");
// setup hardware
setuppins();
pinMode(A0, OUTPUT);
pinMode(A1, OUTPUT);
pinMode(A2, OUTPUT);
pinMode(A3, OUTPUT);
pinMode(A4, OUTPUT);
pinMode(A5, OUTPUT);
pinMode(A6, OUTPUT);
pinMode(A7, OUTPUT);
[color=blue]digitalWrite(A0, HIGH);[/color]
// init global variables
for (uint8_t i = 0; i < NUM_LED_COLUMNS; i++)
{
for (uint8_t j = 0; j < NUM_LED_ROWS; j++)
{
LED_buffer[i][j] = 0;
}
}
LED_buffer[0][0] = true;
Serial.println("Setup Complete.");
}
void loop() {
// put your main code here, to run repeatedly:
scan();
}
