Question

使用Arduino，我创建了一个二维数组，其十六进制数字0-F显示在七段显示器上。一切工作正常，我使用了for循环使显示屏的每个部分都打开，但是顶部显示屏（A）始终处于打开状态，即使不应打开。

void sevenSegment(int a) {
  for (int i = 0; i < nPins; i++) {
    digitalWrite(fontArray[a][i], HIGH);
  }
}

数组：

int fontArray[][7] = { 

  {13, 12, 11, 10, 9, 8}, // 0
  {12, 11},               // 1
  {13, 12, 10, 9, 7},     // 2
  {13, 12, 11, 10, 7},    // 3
  {12, 11, 8, 7},  // 4
  {13, 11, 10, 8, 7},   // 5
  {13, 11, 10, 9, 8, 7},   // 6
  {13, 12, 11}, // 7
  {13, 12, 11, 10, 9, 8, 7},  // 8
  {13, 12, 11, 10, 8, 7},  // 9
  {13, 12, 11, 9, 8, 7},  // A
  {11, 10, 9, 8, 7},  // B
  {13, 10, 9, 8}, // C
  {12, 11, 10, 9, 7}, // D
  {13, 10, 9, 8, 7}, // E
  {13, 9, 8, 7} };  // F

为什么显示屏的顶部（A）的插针13始终在燃烧？：/

Answer 1

这些段永远不会设置回url: www.google.de This is the data we get back from yourUrl: www.google.de - DATA/DATA/DATA。

您将需要以下内容：

Option Explicit

Sub CallRangeL_Urls()
    Dim iCell As Range
    Dim targetRange As Range
    Dim Sheet1 As Worksheet

    Set Sheet1 = ActiveSheet
    For Each iCell In Sheet1.Range("L4:L4")
        'create a new "RESULTS" sheets
        Sheets.Add after:=Sheets(1)
        Debug.Print "New sheet created: " & ActiveSheet.Name

        'set a link on the sheet
        Range("A1").Value = iCell.Value     'leave a copy of the url on the sheet as a reference
        Set targetRange = Range("A3")       'here we want to get the results
        Call ImportData(iCell.Value, targetRange)
    Next iCell
End Sub

Sub ImportData(urlToOpen As String, target As Range)
Dim datavalue1, datavalue2, datavalue3
'...
datavalue1 = "data value 1"
datavalue2 = "data value 2"
datavalue3 = "data value 3"

'Save whatever data to the new sheet
target.Offset(0, 0).Value = datavalue1       'Range("A3")
target.Offset(1, 0).Value = datavalue2       'Range("A4")
target.Offset(2, 0).Value = datavalue3       'Range("A5")

Debug.Print "datavalues stored on sheet: " & target.Parent.Name
'...
End Sub

然后使用：

New sheet created: Sheet2
datavalues stored on sheet: Sheet2

如果引脚号不连续，则可以使用第二个数组，如下所示：

$date = array();
$date['date'] = 1554328800;
$date['events'] = array(130, 131, 163);
$date['tags'] = array(4, "1,3,4", "1,3");

$events_by_tag = array(); //gather events grouped by tag
foreach ($date['events'] as $pos => $event) { //parse all events

    if (is_string($date['tags'][$pos])) { //if tag is a string <=> if there are more than one tag for the current event

        $tags = explode(',', $date['tags'][$pos]); //explode string to loop over the tags
        foreach ($tags as $tag) {
            if (is_array($events_by_tag[$tag])) { //if tag has already been found and then an array exists to store it
                array_push($events_by_tag[$tag], $event);
            } else {
                $events_by_tag[$tag] = array($event); //else create an array for the next times this tag will be found and store it inside
            }
        }

    } else { //if there's a single tag which is a integer

        if (is_array($events_by_tag[$tag])) { //if tag has already been found and then an array exists to store it
            array_push($events_by_tag[$date['tags'][$pos]], $event);
        } else {
            $events_by_tag[$date['tags'][$pos]] = array($event); //else create an array for the next times this tag will be found and store it inside
        }

    }

}

$result_array = array(); //final array reorganized + date
foreach ($events_by_tag as $tag => $events) {
    $tmp_array['date'] = $date['date'];
    $tmp_array['events'] = $events;
    $tmp_array['tags'] = $tag;
    array_push($result_array, $tmp_array);
}

Answer 2

由于接线错误，数组fontArray并未明确初始化所有值。因此，编译器将为这些未初始化的值（在全局数组中）提供默认值0。

结果是调用digitalWrite(0, HIGH)。根据板卡和引脚配置的不同，引脚“ 0”可能会映射到13。

可以使用以下方式编写for循环来防止这种情况：

for (int i = 0; i < nPins; i++) {
  int pin = fontArray[a][i];
  if (pin == 0) {
    break;
  }
  digitalWrite(pin, HIGH);
}

七段显示器始终显示顶部

2 个答案: