This has the effect of producing an average voltage of 500 mV. Notice how that area is equal to the area during the low state this is how we know it's at 50%. The power transmitted is the integral of this plot, which is represented by the blue shading under the curve.

In the case of this output, that means 1 V and 0 V respectively. This means it spends half of its period (τ) in its high state, and the other half in its low state. This is a plot of a square wave at 50% duty cycle. Take a look at this diagram: Square wave at 50% duty cycle Think of it like an integral - we are changing the area under the curve, which is equivalent to power. The duty cycle is the ratio between the time the signal is in the high state and the low state. By producing a square wave and changing the duty cycle, we control the amount of power delivered. Pulse-width modulation (PWM) is a method to control the average voltage of a signal without using analog means, such as a digital-to-analog converter (DAC) or digital potentiometer. Send me a private message here on Hackaday.Post on the ESP8266 Community Forums (note it can take a while to get a response!).

Join the #esp8266 channel on Freenode IRC and ping me (MrAureliusR) or ask anyone who is in there.Ask in the discussion area below the article.If you run into trouble while following these tutorials, you have a few different options: We use the simpler, more widely available HTTP protocol to log data to the cloud Using the NodeMCU MQTT module to communicate with a cloud data service

Using the Wire library for I2C, and AnalogWrite for fading! Looking at using the linker to get PWM, and the included I2C librariesĮSP8266 Lua/NodeMCU Tutorial (You are here) Use the Arduino IDE to simplify development and get up to speed very quickly!Īnd here's the links to the other tutorials in Part 2: ESP8266 SDK Tutorial This is what the pros use!Ī look at the NodeMCU Lua interpreter for the ESP8266. Take a look at Part 1 of this tutorial series: ESP8266 SDK Tutorial

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