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APP INVENTOR硬件交互学习教程06——硬件参数上报 - 创客硬件开发 - 清泛IT...
...loop() {
if(Serial.available()) {
inByte = Serial.read();
if(inByte == 'H'){
digitalWrite(relayPin, HIGH);
Serial.print("ON");
}
if...
APP INVENTOR硬件交互学习教程07——多个参数上报 - 创客硬件开发 - 清泛IT...
...loop() {
if(Serial.available()) {
inByte = Serial.read();
}delay(1000);
sendPara();
}
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4.后续扩展，还可以添加更多的参数。
Lock, mutex, semaphore… what's the difference?
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A lock allows only one thread to enter the part that's locked and the lock is not shared with any other processes.
A mutex is the same as a lock but it can be system wide (shared by multiple processes).
A semaphore does the same as a mutex but allo...
async at console app in C#? [duplicate]
...ole app , does my observation ( last line of question) is correct ? The thread is stopeed at SumTwoOperationsAsync ...right ? (assuming the Main calling method is not marked as async)
– Royi Namir
Jul 13 '13 at 13:17
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How to change background color in the Notepad++ text editor?
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Select Theme: Choose whichever you like best (the top two are easiest to read by most people's preference)
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How to save a list as numpy array in python?
...= [1, 2, 3]
np.array(myList).dump(open('array.npy', 'wb'))
... and then read:
myArray = np.load(open('array.npy', 'rb'))
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Autoresizing masks programmatically vs Interface Builder / xib / nib
...e margins OR'ed together on one line like the example above. Just hard to read.
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Sort JavaScript object by key
...eturning an assignment), but this one works for me and is easier for me to read: Object.keys(dict).sort().reduce((r, k) => Object.assign(r, { [k]: dict[k] }), {});
– aks.
Jun 22 '17 at 22:48
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In Firebase, is there a way to get the number of children of a node without loading all the node dat
...parent.child('upvotes_count').set(event.data.numChildren());
});
You can read the Documentation to know how to Get Started with Cloud Functions.
Also, another example of counting posts is here:
https://github.com/firebase/functions-samples/blob/master/child-count/functions/index.js
Update Januar...
C#: how to get first char of a string?
...0] and MyString.ToCharArray()[0] is that the former treats the string as a read-only array, while ToCharArray() creates a new array. The former will be quicker (along with easier) for almost anything where it will work, but ToCharArray can be necessary if you have a method that needs to accept an ar...