Hi,
I’m new in the mBlock word . I made some programs with scratch but I would like to program my mBot directly with Arduino.
For that, I compare the program did with scratch and I use also example in the Makeblock library.
But I would like to understand how to use in more simple way the green button for example.
If I look in the setup I have
pinMode(A7,INPUT);
Does any one can explain it to me ?
There is is a possibility to have directly an Boolean ?
This statement means set Analog pin 7 (A7) as an input. Since the green button on the mBot is a momentary contact, normally open switch (meaning that the switch only closes a circuit when pressed), the program will detect the switch being closed and will return a value from Analog pin A7.
Hi,
I test reading the green button by programming it :
in the void setup
pinMode(A7,INPUT)
in the void loop
I test the green button with an digitalRead
if (digitalRead==true) { … nothing append
I replace true by HIGH, LOW 0 ,but no reaction
If I want a reaction, I need to use this code
if ((0^(analogRead(A7)>10?0:1))) { …
I visit the arduino web site for understanding the code : ^ is an XOR function but “?” and “:” I don’t find
Does anyone know ?
and why can’t I read A7 directly with digitalread ?
If you set the pin up as an analog pin, you likely need to use the analogRead method, not the digitalRead method. 
One more update on this. The values for the pushbutton are 0 when pressed and 1023 when released. Hope this helps.
One more thing. The pin is set up on analog pin 7 and can only be read using the analogRead method.