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06. Relay effect
06. Relay effect
This digital input example uses a Button to switch the status of a LED every time it is pushed.
Figure 1 - relay effect circuit
Figure 1 - relay effect circuit
1. Circuit
1. Circuit
The circuit is the same as in the previous example.
Connect the Button and the led as shown in Figure 1:
- led positive PIN to d7
- led negative PIN to d8
- Button to PINs D3 and GND.
Notes:
The longer LED PIN is the positive.
Button PINs can also be inverted.
2. Sketch
2. Sketch
Write a sketch K to define:
- the output connections: led :: d7, gnd :: d8
- the input connections: Button :: !D3
- the command to start and stop the system: start, stop
- the rules to implement the automaton (Figure 2).
When the automa has 2 states use led as a status variable.
Button :: !D3gnd :: d8led :: d7Click = Button==1start = [gnd=0,led=0]stop = [led=0]!led & Click -> led=1 ## led & Click -> led=0 ##or simply load the sketch in the workspace with the command
] load e06_relay_effect
Figure 2 - relay effect automaton
Figure 2 - relay effect automaton
3. Try and learn
3. Try and learn
Initialize the system with the command:
] start
the LED is off.
Press and release the button
> Click
the LED turns on and the Click event is sent to the Internet
Press and release the button
> Click
the LED turns off and the Click event is sent to the Internet
4. Summarizing
4. Summarizing
In this lesson you learned or repeated:
- how to use a Button
- the commands: start, stop, ##
- use led as a status variable.
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