September 2016
Intermediate to advanced
495 pages
9h 37m
English
book
Arduino: Building exciting LED based projects and espionage devices
by Adith Jagdish Boloor, Samarth Shah, Utsav Shah, Marco Schwartz
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Controlling the relay
In this part, we are going to program the Arduino board to remotely control the relay and LED that are connected to the board by sending an SMS to the FONA shield. As most of the code is similar to the code that we saw in the previous section, I'll only detail the new elements of code here.
We need to define the pins on which the relay and the LED are connected:
#define RELAY_PIN 7 #define LED_PIN 8
Then, we'll define a set of variables for a counter for the relay/lock. This is needed because after we open a lock, for example, we will want it to close automatically after a given amount of time for the purpose of safety. Here, we use a delay of 5 seconds:
bool lock_state = false; int init_counter = 0; int lock_counter = 0; int ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.