PushbuttonSwitch < AFNOG

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---+ A simple push button switch

The simplest !WeMosD1 shield is just features a single push button. It uses the !WeMos' ESP8266 D3 pin which corresponds to GPIO 0.

<img alt="wemosPushbutton.png" height="144" src="%ATTACHURL%/wemosPushbutton.png" title="wemosPushbutton.png" width="155" />
---++ Testing the switch

Before trying to integrate the switch into out !IoT network and reading it's state through Cayenne we first write a simple test program to see if it works the way we expect.

The test program is very simple:

<img alt="buttonuPyCraft.png" height="885" src="%ATTACHURL%/buttonuPyCraft.png" title="buttonuPyCraft.png" width="1212" />

We define GPIO pin 0 to be an input pin (or pin 17 when running on an ESP32) with an internal pull-up resistor through the _machine_ library class <i>Pin. </i>Then we read the pin value which tells us if the button is pressed or not. The switch connects GPIO 0 to ground if pressed.

Here is the source of this test program:

https://github.com/uraich/MicroPython_IoTDemos/blob/master/drivers/button/button.py

Upload it to the !WeMos D1 flash and execute it in uPyCraft or thonny.

Once the hardware is tested we add the !WiFi code and the connection to the !myDevices MQTT broker.

https://github.com/uraich/MicroPython_IoTDemos/blob/master/cayenne/button/cayenneButton.py

This is what you should see in Cayenne:

<img alt="buttonCayenne.png" height="467" src="%ATTACHURL%/buttonCayenne.png" title="buttonCayenne.png" width="800" />

The push button is connected to channel 1 in Cayenne and shows a state of 1 if pushed and 0 if released

-- %USERSIG{UliRaich - 2019-03-22}%

---++ Comments

%COMMENT%

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
png	buttonCayenne.png	r1	manage	164.4 K	2019-03-22 - 09:32	UliRaich
png	buttonTest.png	r1	manage	36.0 K	2019-03-22 - 09:10	UliRaich
png	buttonuPyCraft.png	r1	manage	184.2 K	2019-03-22 - 09:22	UliRaich
png	wemosPushbutton.png	r1	manage	42.5 K	2019-03-22 - 09:02	UliRaich

Topic revision: r3 - 2019-05-17 - UliRaich