{"id":2535,"date":"2018-12-14T00:00:12","date_gmt":"2018-12-13T23:00:12","guid":{"rendered":"https:\/\/iot.fkainka.de\/?p=2535"},"modified":"2018-11-21T12:42:09","modified_gmt":"2018-11-21T11:42:09","slug":"day14-2018","status":"publish","type":"post","link":"https:\/\/iot.fkainka.de\/en\/day14-2018","title":{"rendered":"Day 14: Smart Lights"},"content":{"rendered":"

The door of day 14 reveals another LED. Now we have two LEDs with resistors and two buttons and 14. Tag <\/strong>cables, enough to build a complex lighting system. We will use the following setup:<\/p>\n

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Setup with four loose cables (yellow) as touch buttons<\/p><\/div>\n

Enable today\u2019s program and install today\u2019s flow. Don\u2019t forget, replace [PID]<\/strong> with your personal ID and the easiest way is using the trick with the Editor.<\/p>\n

The LEDs in the program you just enabled are set as PWM LEDs. This means that you can change the brightness of the LEDs. The values range from 0 to 255. Beside that however, you can still switch LEDs on or off like digital outputs. Use the following commands:<\/p>\n\n\n\n\n\n\n\n\n\n
Command in topic<\/strong><\/td>\nSettings<\/strong><\/td>\n<\/tr>\n
{“cmd”:”set_pwm_state”, “LED1”:255}<\/td>\nThe LED is set to maximum brightness. You can see it only when the LED is on.<\/td>\n<\/tr>\n
{“cmd”:”set_pwm_state”, “LED1”:0}<\/td>\nThe LED is set to the minimum brightness (the LED is not on).<\/td>\n<\/tr>\n
{“cmd”:”set_pwm_state”, “LED1”:true}<\/td>\nThe LED is activated and the last brightness is set. You will immediately notice any changes in brightness.<\/td>\n<\/tr>\n
{“cmd”:”set_pwm_state”, “LED1″:”ON”}<\/td>\n<\/tr>\n
{“cmd”:”set_pwm_state”, “LED1”:false}<\/td>\nThe LED is deactivated. You will notice a change in brightness only after activating the LED again.<\/td>\n<\/tr>\n
{“cmd”:”set_pwm_state”, “LED1″:”off”}<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

These status changes can be sent via the out<\/strong> topic or NodeESP\/[PID]\/pwm\/state\/set<\/strong>. In case of a status change, the current state will also be published via the topic<\/p>\n

NodeESP\/[PID]\/pwm\/state\/get\/out<\/strong><\/p>\n

In today\u2019s program we have two buttons and four touch buttons activated, which function according to the method we already know. The Node-RED flow today is a bit bigger, because we have an UI button for every button and every setting.<\/p>\n

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User interface of the program today<\/p><\/div>\n

The user interface already provides some hints how the experiment today will work. The two LEDs simulate two dimmable lamps in a home. They are switched on or off with the two buttons on the board or via the web interface. The brightness can be adjusted using the UI controls. The buttons below are used to change the brightness by +10 or -10. The touch buttons have the same function. If you touch the wire pictured on the left in the setup figure, you will decrease the brightness of the LED on the left-hand side over time. The wire on the very the right increases the brightness. The two remaining wires work for the right LED in the same way. You can also change the brightness, if the LED is not on. The change will become noticeable only after you turn the LED on. The function is still very useful in case, you want to adjust the brightness of the lamp depending on the time of day, for example<\/p>\n

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The flow today<\/p><\/div>\n