MicroPython for ESP8266 Development Workshop


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Step 1: What Is MicroPython ?

Tero Karvinen. Make a Mind-Controlled Arduino Robot. Exploring Arduino. Jeremy Blum. Alasdair Allan. Raspberry Pi Hardware Projects 2. Andrew Robinson. Raspberry Pi Hardware Projects 1. FreeCAD [How-to].

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Arduino Sketches. James A. WebGL Programming Guide. Kouichi Matsuda. Blender 2. Michel J. Programming with Qt. Matthias Kalle Dalheimer. Programming Interactivity. Joshua Noble. Matthew Scarpino. Arduino: Guide to Step-by-Step. First, we have to redefine the pin mode in setup function. I have attached the LED to pin D Then change the pin value in the pin usage functions:. Your code should look like this:. Now we should have the external LED blinking.

But we want to control it. Adding a button. Plug one pin from the button to a digital pin, such as D2, and other pin to the gnd Ground pin. See the pic below for a proper installation. The sketch should work out of the box with updating pin values. When you have uploaded the code to the chip, the LED should be lighted already. When you press the button, the led turns off. As default, the input pin is in HIGH value, what means that there is current going through constantly. You can invert this by adjusting code a bit:.

And here we have a functioning button attached in the NodeMCU chip. Nice little thing this button, but it would be cool if the LED stays On…. Okay, so what do we need? We need to save the state and toggle the state while pressing the button. I think you can manage that. Wait a minute! Yup, there is this one issue with buttons — they are mechanic and, thus, can cause unexpected behavior. This unexpected behavior usually is caused by the by the noise that can make fast undesired changes in the button state.

To simplify the issue with the noise, imagine a situation where you drop a ball on the floor and it keeps bouncing for a while. Similarly, when you press the button, the button keeps bouncing for a while before it stabilizes to the desired state. Below is a picture showing the impact of bouncing. To avoid the noise we have to implement Debouncing. Try to think of ways how to identify and make distinction between intentional and unintentional presses and how to avoid latter. If you get stuck, use the good old arduino IDE examples library.

There exists one solution for this particular issue as well Hint: Also, you can read more about switches on Wikipedia. After learning the basics of the hardware, it is time to add some sensors on it. In this module, we are going to plug a humidity and temperature tracking sensor into the microcontroller and read the data measurements through the serial port of the ESP microcontroller. Installing a library for using DHT sensors. Why bother to code your own functions, if someone have already made them for ya.

ESP8266 and MicroPython (E-book)

Install version 1. Attaching a DHT22 Sensor to the chip. Plug the DHT22 Sensor to the chip according to the pic below. DHT22 have three wires instead of two: one for power supply positive , one for ground negative , and one for digital output O pin. Welcome Serial Monitor! You may have guessed, that we are again using the awesome arduino IDE library of examples.

Modify the pin value according to your connections and upload the program. It should work out of the box.

But how can we read the data from the sensor? We have to open the Serial Monitor to catch the messages from the chip. Now you have opened the Serial Monitor that is great tool for reading user input and printing the output. However, there are some critical differences in the settings required to setup the boards. Detailed Python installation instructions for Windows can be found here. Enter python into the text box. You should see a command prompt and Python version information displayed.

MicroPython for ESP8266 Development Workshop MicroPython for ESP8266 Development Workshop
MicroPython for ESP8266 Development Workshop MicroPython for ESP8266 Development Workshop
MicroPython for ESP8266 Development Workshop MicroPython for ESP8266 Development Workshop
MicroPython for ESP8266 Development Workshop MicroPython for ESP8266 Development Workshop
MicroPython for ESP8266 Development Workshop MicroPython for ESP8266 Development Workshop
MicroPython for ESP8266 Development Workshop MicroPython for ESP8266 Development Workshop
MicroPython for ESP8266 Development Workshop MicroPython for ESP8266 Development Workshop

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