Added sonar example, fixed URL-s
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4
Makefile
4
Makefile
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@ -13,7 +13,3 @@ flash:
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console:
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echo "Ctrl-A + Ctrl-Q to close Picocom"
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picocom -b115200 /dev/ttyUSB0
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dep:
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sudo apt install python3-pip
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sudo pip3 install adafruit-ampy
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81
README.md
81
README.md
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@ -2,14 +2,23 @@
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## Getting started
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MicroPython project skeleton
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This howto assumes Ubuntu 16.04 is used on the computer and several tools have been installed:
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```
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git clone http://git.k-space.ee/lauri/micropython-skeleton
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sudo apt install picocom make python3-pip
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sudo pip3 install esptool.py adafruit-ampy
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```
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Clone the Git repository and run makefiles:
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```
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git clone https://github.com/k-space-ee/micropython-skeleton
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cd micropython-skeleton
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make
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```
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## Blinking LED-s
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First let's some LED-s blinking.
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Press Ctrl-E for paste mode, otherwise spaces get mangled.
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Press Ctrl-Shift-V for pasting.
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@ -47,7 +56,7 @@ Tasks:
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# Button presses
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## Button presses
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On the board there is button labelled "Boot", this is hooked up to pin 2.
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By default there is a resistor which pulls the voltage on the pin to 3.3v, but when button is pressed the pin is shorted to ground so the voltage goes to 0v.
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@ -79,7 +88,7 @@ Tasks:
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# Driving OLED screens
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## Driving OLED screens
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Let's get some pixels on the screen.
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There's 128x64 pixels monochrome OLED screen connected via I2C bus on the pins 4 and 5.
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@ -107,6 +116,13 @@ Tasks:
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Next let's hook up DHT11 sensor to the board and measure the temperature.
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* Sensor's Vcc is connected to 3.3v on the board
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* Ground pins (GND) are connected
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* Sensor's data pin is connected to board pin 4
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Some code to get you going:
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```
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from time import sleep
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from machine import Pin
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@ -115,20 +131,60 @@ from dht import DHT11
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d = DHT11(Pin(4))
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try:
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d.measure()
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d.measure()
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except OSError:
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print("Sensor not connected")
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print("Sensor not connected")
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else:
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print("Temperature %sC" % d.temperature())
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print("Humidity %s%%" % d.humidity())
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print("Temperature %sC" % d.temperature())
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print("Humidity %s%%" % d.humidity())
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finally:
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sleep(1)
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sleep(1)
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```
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Tasks:
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1. Get temperature and humidity displayed on the screen
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## Distance with sonar
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In this case HC-SR04 is hooked up:
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* Trigger is connected to pin 25
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* Echo is connected to pin 26
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* GND pins are connected
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* Sonar's Vcc is connected to 3.3V on the board
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Code to measure distance:
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```
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from time import sleep_us, sleep_ms
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from machine import Pin, time_pulse_us
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trigger = Pin(25, Pin.OUT)
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echo = Pin(26, Pin.IN)
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def measure():
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trigger.value(0)
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sleep_us(5)
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trigger.value(1)
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sleep_us(10)
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trigger.value(0)
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duration = time_pulse_us(echo, 1, 29000)
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distance = (duration / 2.0) / 29
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return distance
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while True:
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print("Distance is: %s cm" % measure())
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sleep_ms(200)
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```
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Tasks:
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1. Get distance shown on OLED display
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## Connecting to internet
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Exit the serial console by pressing Ctrl-A and then Ctrl-Q.
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@ -176,9 +232,10 @@ Using web browser navigate [here](http://iot.koodur.com/demo2.html#living-room-o
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1. Move to another channel to prevent flipping lights in my living room
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2. Improve the code so the "Boot" button and button in the web interface both work simultaneously
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3. Download the HTML file and add buttons to select different colors, adjust Python code to handle new commands
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4. Add code to send sensor readings to the webserver
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# Summary
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## Summary
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ESP32 microcontroller with MicroPython is a really cheap way to get started with the IoT stuff. See more detailed information [here](https://lauri.xn--vsandi-pxa.com/2017/06/espressif.html).
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@ -190,4 +247,6 @@ Some more tricks to try:
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Other interesting projects with ESP8266 and ESP32 microcontrollers:
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* [Nixie clock](https://github.com/k-space-ee/nixiesp12) with ESP8266
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* [Sumorobot](http://robot.itcollege.ee/sumorobot/2017/08/25/sumesp-prototype/) with ESP32
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* [Sumorobot](http://robot.itcollege.ee/sumorobot/2017/08/25/sumesp-prototype/) with ESP32
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Come and visit [k-space.ee](https://k-space.ee) on Wednesdays 18:00 for more of MicroPython
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