These slides: slides.cuban.tech/micropython.html
Network: cubantech
Password: meet-ups
--
- Slides are based on a talk by Lars de Ridder
- The workshop is based heavily on Nodebots with CubanTech workshop
- ... which is based heavily on a workshop by NY-Javascript (see bit.ly/nyjs-nodebots)
- ... which is based heavily on a workshop by Francis Gulotta and Rick Waldron
- You can find the slides for that workshop at gul.ly/3tjj
- You can sign up for one of their workshops on the Nodebots NYC Meetup page
Upcoming CubanTech Events
Who had heard of it before?
And who used it before?
For something serious?
For something that is running right now?
MicroPython is a lean and fast implementation of the Python (version 3) programming language that is optimised to run on a microcontroller.
--
- Kickstarted in November 2013
- Original kickstarter ended April 2015
- £97,803 first campaign
- +£200,000 in total
- Code open source : github.com/micropython
- Existing community (that includes you)
- Easy to learn, with powerful features
- Good separation between int and float (unlike JS/Lua)
- Native bitwise operations on 1's and 0's (unlike Lua)
- Ideal for rapid prototyping
- Bridge between web-world and IoT world
- Lots of opportunities for optimization!
--
Mainly due to RAM usage. Examples:
- Preallocation of 257 + 5 ints = 4k RAM
- Method calls: led.on() creates a bound method object = 20 bytes RAM
--
128kb ROM / 8kb RAM (after subtracting other software)
--
- Many strings predefined in ROM (led, on, read, ...)
- Optimised method calls
- Everything that can be in ROM, is in ROM
- Garbage collection: Mark-and-sweep (no reference counts)
--
A tagged pointer is a pointer (concretely a memory address) with additional data associated with it
- Integer - xxxx xxxx xxxx xxx1
- String - xxxx xxxx xxxx xx10
- Object - xxxx xxxx xxxx xx00
- One full time developer, two core contributors
- Partly funded by the European Space Agency
- Kickstart in May 2016 for proper ESP8266 sockets support
- Feels like it's maturing
It depends on your board
But it's amazing for prototyping!
Or for embedding in games and apps
--
... has happened before, not MicroPython though ...
--
All internal logic, including AI. The API is available .
--
Almost everything except the rendering engine , according to Steve Moret
--
Scripts of the missions
--
All internal logic, including AI. The API is available .
--
Gameplay , scores , team stats
- Reference implementation
- Initially only on the pyboard, now on multiple chips
- ARM 32bit Cortex M4 @ 168Mhz, 1Mb flash, 192kb RAM
- Accerelometer, RTC, 4 LEDs, 2 switches, 30 GPIO
16kb RAM, 256kb flash, Cortex M0 @ 16 MHz
--
Supplied to 1 million school children
- Online Python editor
- Mobile app to upload code
- Tons of documentations, teaching material, etc.
--
- Graphical drag-and-drop editor
--
- 25 LEDs
- Two programmable buttons
- Accelerometer & magnetometer
- Bluetooth
- 5 GPIO
--
Shipping is free for orders in the UK \o/
256kb RAM, 2Mb flash, 25 GPIO, Cortex M4 @ 80 MHz
LoRa + Python
--
- Long range, low power wireless platform
- Prevailing technology choice for building IoT networks worldwide.
- +500 members
- LoRaWAN� Protocol Deployments
- Low Power WAN (LPWAN) specification for wireless battery operated Things
 |
 |
--
 |
 |
| RFM59 LoRA - 900 MHz | Packet Radio 433 MHz, 868 or 915 MHz |
--
 |
 |
| WiFi | Bluetooth |
--
- USB storage key UF2 bootloader
- ATSAMD21G18 @ 48MHz with 3.3V logic/power
- 256KB of FLASH + 32KB of RAM
- 32.768 KHz crystal for clock generation & RTC
- 3.3V regulator with 500mA peak current output
- USB native support (USB bootloader, serial port debugging)
--
- 20 GPIO pins (PWM outputs for all)
- Hardware Serial, I2C, SPI support
- 6 x 12-bit analog inputs
- 1 x 10-bit analog ouput (DAC)
- Built in 100mA lipoly charger (with LED)
- Pin #13 red LED
... also runs on ESP8266 (i.e. a lot of) chips
--
 |
 |
--
--
--
--
--
- ESP8266 @ 80MHz or 160 MHz
- 3.3V logic/power, 500mA peak current output
- 4MB of FLASH (32 MBit)
- CP2104 USB-Serial converter onboard
- 921600 max baudrate for uploading
- 9 GPIO pins
- can also be used as I2C and SPI
- 1 x analog inputs 1.0V max
--
Feather HUZZAH ESP8266 - pinout
--
- 1 x Analog input (1.0V max)
- 9 x GPIO (3.3V logic)
- Also used for I2C or SPI
- 2 x UART pins
- 2 x 3-6V power inputs
- reset, enable, LDO-disable
- 3.3V output
--
- voltage regulator (stick to 4V to 6V)
- Schottky diodes for variable voltages
- VBat : Lipoly battery
- V+ : 5V ( FTDI/serial header )
--
- TX ( 3.3V ) and RX ( 5V )
--
- No pull-up in #0
- 3.3V logic
- max current drawn : 12mA.
- Full spec sheet
--
- A : analog input ( 0 - 1.0V )
- LDO : connect to GND to turn 3.3V regulator off
- RST ( 5V ) EN ( 3.3V )
- down to GND to reset ESP8266
 |
|
--
- Graphical drag-and-drop editor
- Online Python and Javascript editor
- Tons of documentations, teaching material, etc.
--
- ATSAMD21 ARM Cortex M0 Processor
- 3.3V and 48MHz
- 2 MB of SPI Flash storage
- MicroUSB port
- Programming and debugging
- serial port
- keyboard, mouse
- joystick or MIDI
--
- 10 x mini NeoPixels
- 1 x Motion sensor (LIS3DH)
- Triple-axis accelerometer
- Tap and free-fall detection
- 1 x Temperature sensor (thermistor)
- 1 x Light sensor (phototransistor).
- Color sensor and pulse sensor.
--
- 1 x MEMS microphone
- 1 x Mini speaker with class D amplifier
- 2 x Push buttons
- Infrared receiver and transmitter
- Receive and transmit any remote control codes
- Send messages between Circuit Playground Expresses
- Proximity sensor.
--
- 8 x alligator-clip friendly input/output pins
Lowest-cost CircuitPython programmable board!
... pre-installed out-of-the-box !
--
- Same size, form-factor, and pinout as classic Trinket
- ATSAMD21E18 32-bit Cortex M0+ Atmel ATSAMD21 microcontroller (ATtiny85 8-bit AVR)
- 48 MHz 32 bit processor (+6x faster)
- 256KB Flash (8KB ⇒ 32x), 32 KB RAM (512B ⇒ 64x)
--
- Native USB supported by every OS (missing in Trinket)
- Arduino IDE
- CircuitPython USB serial console
- Keyboard/Mouse HID
- ... even a little disk drive for storing Python scripts.
--
- Micro B USB connector
- 3 built-in LED (RGB DotStar LED, Red #13 LED, ON LED)
- Reset Button
--
- Battery Input (tied to the BAT pin) to solder on a JST PH connector to power it from an external battery.
- Lithium Polymer battery or JST 3xAAA battery packs
- Protections : reverse-polarity, over-current and thermal.
- Switch between USB and battery (highest voltage)
Checkout specs of your board ↓ ... and keep them open
--
--
--
--
--
--
--
--
--
--
Zero conf
pip install esptoolSince Version 1.3 supports both Python 2.7 and 3.4
(or higher)
--
$ udevadm monitor --udev
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
UDEV [1504678146.578976] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 (usb)
UDEV [1504678146.746860] add /module/usbserial (module)
UDEV [1504678146.747288] add /bus/usb-serial (bus)
UDEV [1504678146.747855] add /bus/usb/drivers/usbserial (drivers)
UDEV [1504678146.748149] add /bus/usb/drivers/usbserial_generic (drivers)
UDEV [1504678146.748241] add /bus/usb-serial/drivers/generic (drivers)
UDEV [1504678146.772466] add /module/ch341 (module)
UDEV [1504678146.772783] add /bus/usb-serial/drivers/ch341-uart (drivers)
UDEV [1504678146.774556] add /bus/usb/drivers/ch341 (drivers)
UDEV [1504678146.774614] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0 (usb)
UDEV [1504678146.775507] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/ttyUSB0 (usb-serial)
UDEV [1504678146.803046] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/ttyUSB0/tty/ttyUSB0 (tty)
--
$ ls /dev/cu*serial*
/dev/cu.wchusbserial1410
--
esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0 esp8266-20170526-v1.9.bin- Specify the device name identified earlier after
--port - Reduce the baudrate if you get errors when flashing (e.g. down to 115200)
--
For some NodeMCU boards specify -fm dio option
esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect -fm dio 0 esp8266-20170526-v1.9.bin- Download UF2 image file
- e.g. the latest CPX CircuitPython UF2 for Circuit Playground Express
- Plug your board into your computer using USB data cable
- [OPTIONAL] Reset your board
- e.g. Double-click the small Reset button in the middle of the CPX
--
- Check your board is in bootloader mode
- e.g. all of the LEDs turn green in CPX
--
- A new disk drive appears
- Name may vary e.g.
CPLAYBOOTfor CPX
- Name may vary e.g.
--
- Copy (drag) image file onto boot drive
- Download BIN image files e.g. latest BIN for CPX
- Download latest version of bossac
mingw32for Windows,apple-darwinfor Mac OSX, and severallinuxoptions
--
$ bossac -e -w -v -R ~/Downloads/adafruit-circuitpython-circuitplayground_express-1.0.0.binerase the chip, write the given file, verify the write and Reset the board
- Plug mini-USB (board) to USB (laptop) cable
- Identify USB device
- Connect over serial connection
--
```sh $ udevadm monitor --udev monitor will print the received events for: UDEV - the event which udev sends out after rule processingUDEV [1504678146.578976] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2 (usb) UDEV [1504678146.746860] add /module/usbserial (module) UDEV [1504678146.747288] add /bus/usb-serial (bus) UDEV [1504678146.747855] add /bus/usb/drivers/usbserial (drivers) UDEV [1504678146.748149] add /bus/usb/drivers/usbserial_generic (drivers) UDEV [1504678146.748241] add /bus/usb-serial/drivers/generic (drivers) UDEV [1504678146.772466] add /module/ch341 (module) UDEV [1504678146.772783] add /bus/usb-serial/drivers/ch341-uart (drivers) UDEV [1504678146.774556] add /bus/usb/drivers/ch341 (drivers) UDEV [1504678146.774614] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0 (usb) UDEV [1504678146.775507] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/ttyUSB0 (usb-serial) UDEV [1504678146.803046] add /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/ttyUSB0/tty/ttyUSB0 (tty)
$ picocom /dev/ttyUSB0 -b115200
</small>
... not always `ttyUSB0` e.g. `ttyACM0`
--
### Identify and connect over USB - Mac OS X
```sh
$ ls /dev/cu*serial*
/dev/cu.wchusbserial1410
$ screen /dev/cu.wchusbserial1410 115200 -L
MicroPython v1.9-8-gfcaadf92 on 2017-05-26; ESP module with ESP8266
Type "help()" for more information.
>>>
... The device name might not be /dev/cu.wchusbserial1410
--
... set speed to 115200 (instead of 9600)
--
>>> print('Hello world!')
Hello world!
>>> with open('cubantech.txt', 'w') as f:
>>> f.write('Hello CubanTech!')
>>> with open('cubantech.txt', 'r') as f:
>>> for l in f:
>>> print l
Hello CubanTech!
>>> try:
>>> 1/0
>>> except ZeroDivisionError as e:
>>> print("Oh, you!")
Oh, you!>>> import functools
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: no module named 'functools'
>>> import this
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: no module named 'this'systimestructmachine- functions related to the boardmicropython- internals- Specific ports provides specific hooks, REPL and custom modules
Written in Python (remember PyPy?)
$ micropython -m upip install micropython-functools
$ ./micropython
MicroPython v1.7-116-g8dd704b on 2016-04-19; linux version
Use Ctrl-D to exit, Ctrl-E for paste mode
>>> import functools
>>> dir(functools)
['__name__', 'reduce', 'partial', 'update_wrapper', '__file__', 'wraps']
https://github.com/micropython/micropython-libasync def ping_pygrunn():
return await ping_server('pygrunn.org')... for PyBoard and STM chips
--
- Disable interrupts
- Trigger and disable GC
- Write inline assembler
- Emit bytecode or machine code
--
>>> @micropython.asm_thumb
... def fun():
... movw(r0, 42)
...
>>> print(fun())What's the result?
--
@micropython.asm_thumb
def led_on():
movwt(r0, stm.GPIOA)
movw(r1, 1 << 13)
strh(r1, [r0, stm.GPIO_BSRRL])Turn on the red LED in the PyBoard (i.e. PA13 high)
stm- PyBoard constantsstm.GPIOA- memory address offset to GPIOAmovwtmoves a 32-bit into register (movw+movt)stm.GPIO_BSRRL- STM32 Bit Set/Reset Register
--
>>> @micropython.asm_thumb
... def asm_add(r0, r1):
... add(r0, r0, r1)
...
>>> asm_add(1, 2)
3- Up to 4 arguments
- They must be named
r0,r1,r2andr3
--
@micropython.asm_thumb
def flash_led(r0):
# get the GPIOA address in r1
movwt(r1, stm.GPIOA)
# get the bit mask for PA14 (the pin LED #2 is on)
movw(r2, 1 << 14)
b(loop_entry)
label(loop1)
# turn LED on
strh(r2, [r1, stm.GPIO_BSRRL])
# delay for a bit
movwt(r4, 5599900)
label(delay_on)
sub(r4, r4, 1)
cmp(r4, 0)
bgt(delay_on)
# turn LED off
strh(r2, [r1, stm.GPIO_BSRRH])
# delay for a bit
movwt(r4, 5599900)
label(delay_off)
sub(r4, r4, 1)
cmp(r4, 0)
bgt(delay_off)
# loop r0 times
sub(r0, r0, 1)
label(loop_entry)
cmp(r0, 0)
bgt(loop1)label(x)- assign labelb(x)unconditional branchbgt(x),blt(x), ... conditional branch
--
@micropython.native
def foo(self, arg):
# codeRoughly twice as fast, but larger binary
--
@micropython.viper
def foo(self, arg: int) -> int:
# code- Now actually called Zerynth and kind of confusing
- Not fully standards-compliant Python code
- Produces machine instructions
--
If you have trouble finding a component, let us know and we'll get you a replacement
Feel free to select the components you like most and complete the challenges that most interest you
- Network programming with ESP8266
- LEDs (Light Emitting Diodes)
- Buttons
- Servos
- IoT applications with MQTT
- WiFi access point (AP)
- ESSID is of the form MicroPython-xxxxxx (MAC address of your device)
- Factory reset Password
micropythoN - IP address
192.168.4.1
- Station interface
>>> import network
>>> sta_if = network.WLAN(network.STA_IF)
>>> ap_if = network.WLAN(network.AP_IF)>>> sta_if.active()
False
>>> ap_if.active()
True
>>> ap_if.config('essid')
MicroPython-04320781
>>> ap_if.config(essid='micropy012')
>>> ap_if.ifconfig()
('192.168.4.1', '255.255.255.0', '192.168.4.1', '8.8.8.8')Returned values are: IP address, netmask, gateway, DNS.
--
| Parameter | Type | Description |
|---------------------|------------------------------------------|
| mac | bytes | MAC address (bytes) |
| essid | string | WiFi access point name (string |
| channel | int | WiFi channel (integer) |
| hidden | bool | Whether ESSID is hidden |
| authmode | enum | Auth mode supported (see dir(network)) |
| password | string | WiFi access password |
>>> sta_if.active(True)
>>> sta_if.connect('cubantech', 'meet-ups')
>>> sta_if.isconnected() # Might take a while
True
>>> sta_if.ifconfig()
('192.168.0.2', '255.255.255.0', '192.168.0.1', '8.8.8.8')git clone https://github.com/micropython/webreplDownload WebREPL from the Internet
git clone ssh://[email protected]:2222/micropython/webrepl.gitimport webrepl_setup- Follow the on-screen instructions and prompts
- Reboot your MicroPython device.
- Connect to the ESP8266's access point
- Launch WebREPL
- Open
webrepl.htmlin your browser
- Open
- Click the "Connect" button
- Type the password set with
webrepl_setupwhen prompted
>>> import socketWe have sockets !!!
State of all GPIO pins
import machine
pins = [machine.Pin(i, machine.Pin.IN) for i in (0, 2, 4, 5, 12, 13, 14, 15)]
html = """<!DOCTYPE html>
<html>
<head> <title>ESP8266 Pins</title> </head>
<body>
<h1>ESP8266 Pins</h1>
<table border="1"> <tr><th>Pin</th><th>Value</th></tr> %s </table>
</body>
</html>
"""
import socket
addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
s = socket.socket()
s.bind(addr)
s.listen(1)
print('listening on', addr)
while True:
cl, addr = s.accept()
print('client connected from', addr) cl_file = cl.makefile('rwb', 0)
while True:
line = cl_file.readline()
if not line or line == b'\r\n':
break
rows = ['<tr><td>%s</td><td>%d</td></tr>' % (str(p), p.value()) for p in pins] response = html % '\n'.join(rows)
cl.send(response)
cl.close()- Network programming with ESP8266
- LEDs (Light Emitting Diodes)
- Buttons
- Servos
- IoT applications with MQTT
- Long pin is positive (and goes to power)
- Short pin is negative (and goes to ground)
--
--
Run this in (USB or web) REPL
import machine
import time
pin_id = 4 # NodeMCU
# PyBoard = 'A14'
# Huzzah Feather = 15
led = machine.Pin(pin_id, machine.Pin.OUT)
while True:
led.high()
time.sleep(0.5)
led.low()
time.sleep(0.5)Exit loop with Ctrl-c
--
| Physical name | CPU name | LED description |
|---|---|---|
| P2 | B4 | blue LED |
| P3 | A15 | yellow LED |
| P4 | A14 | green LED |
| P5 | A13 | red LED |
--
- Red LED at pin 0
- Blue LED at pin 2
- You probably noticed the light blinks about every .5 seconds
- Change the code to blink at a different rate and then rerun it to make sure it works
- If you're stuck, press ↓ to see a potential solution
--
import machine
import time
pin_id = 4 # NodeMCU
# PyBoard = 'A14'
# Huzzah Feather = 15
led = machine.Pin(pin_id, machine.Pin.OUT)
while True:
led.high()
time.sleep(3.0)
led.low()
time.sleep(3.0)Now that you've got the basics of LEDs, you can either move on to the next component, or work on some LED challenges
- Press → to move on to the next component
- Press ↓ to scroll through the LED challenges
--
Try to solve them yourself before looking at the solution!
Press ↓ to scroll through the following challenges (and potential solutions)
- Multiple Lights
- Holiday Lights
- Binary Counter
--
Have 2 (or more) lights alternate blinking
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var led1 = new five.Led(10);
var led2 = new five.Led(11);
var flag = false;
setInterval(function() {
if (flag) {
led1.on();
led2.off();
} else {
led1.off();
led2.on();
}
flag = !flag;
}, 500);
});--
Make an LED (or multiple LEDs) go through different settings like some holiday lights do. It should change the setting every few seconds. Below are some example settings. You can see an example on the next slide.
- Off
- Solid
- Blinking
- Pulsing (fading in and out)
- Different speeds of blinking, pulsing, or alternating
- Alternating which lights are on
--
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var led = new five.Led(11);
var setting = 0;
setInterval(function() {
led.stop(); // If we call pulse, we need to stop it
switch (setting) {
case 0:
led.pulse();
break;
case 1:
led.off();
break;
case 2:
led.on();
break;
}
setting = (setting + 1) % 3;
}, 3000);
});--
- Expose a function to the REPL that allows you to switch to the next setting from the REPL
- Add a button that when pressed will go to the next setting (N.B: you should complete the Button Component slides before attempting this)
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var led = new five.Led(11);
var setting = 0;
function changeSetting() {
led.stop(); // If we call pulse, we need to stop it
switch (setting) {
case 0:
led.pulse();
break;
case 1:
led.off();
break;
case 2:
led.on();
break;
}
setting = (setting + 1) % 3;
}
this.repl.inject({
cs: changeSetting // Now we can call cs() from the REPL
});
});--
You're on your own for this one!
--
Using 3 LEDs, count from 0 to 7 in binary as shown below. On represents 1 and off repesents 0.
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var led1 = new five.Led(9);
var led2 = new five.Led(10);
var led3 = new five.Led(11);
var num = 0;
setInterval(function() {
var binary = (num).toString(2);
binary.slice(-1) === "1" ? led1.on() : led1.off();
binary.slice(-2, -1) === "1" ? led2.on() : led2.off();
binary.slice(-3, -2) === "1" ? led3.on() : led3.off();
num = (num + 1) % 8;
}, 1000);
});--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var leds = [new five.Led(9), new five.Led(10), new five.Led(11)];
var num = 0;
setInterval(function() {
var mask = 1;
for (var i = 0; i < leds.length; ++i, mask <<= 1) {
var led = led[i];
num & mask? led.on() : led.off();
}
num = (num + 1) % 8;
}, 1000);
});--
Allow the user to enter a number through the REPL and display it in binary on the LEDs
--
You're on your own for this one!
- Network programming with ESP8266
- LEDs (Light Emitting Diodes)
- Buttons
- Servos
- IoT applications with MQTT
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var button = new five.Button(2);
button.on("press", function() {
console.log("Button Pressed!");
});
button.on("hold", function() {
console.log("Button Held!");
});
button.on("release", function() {
console.log("Button Released!");
});
});node button.js
Try pressing, releasing, and holding the button
You should see some output like this in the REPL
>> Button Pressed!
Button Released!
Button Pressed!
Button Released!
Button Pressed!
Button Held!
Button Held!
Button Released!
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var led = new five.Led(11);
var button = new five.Button(2);
button.on("press", function() {
led.on();
});
button.on("hold", function() {
led.blink(50);
});
button.on("release", function() {
led.stop().off();
});
});node button_led.js
The LED should go on when you press, off when you release, and blink when you hold
Now that you've got the basics of buttons, you can either move on to the next component, or work on some button challenges
- Press → to move on to the next component
- Press ↓ to scroll through the button challenges
--
Try to solve them yourself before looking at the solution!
Press ↓ to scroll through the following challenges (and potential solutions)
- Light Switch
- Passcode
- Holiday Lights
--
Have pressing a button alternate turning an LED on and off
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var led = new five.Led(11);
var button = new five.Button(2);
var on = false;
button.on("press", function() {
if (on) {
led.off();
} else {
led.on();
}
on = !on;
});
});--
Have 2 buttons and 1 LED. Make it so you have to press the buttons in a certain order to turn the LED on.
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var led = new five.Led(11);
var button1 = new five.Button(2);
var button2 = new five.Button(4);
var passcode = "12112";
var presses = "";
button1.on("press", function() {
presses += "1";
if (presses.indexOf(passcode) > -1) {
led.on();
}
});
button2.on("press", function() {
presses += "2";
if (presses.indexOf(passcode) > -1) {
led.on();
}
});
});--
Make an LED (or multiple LEDs) go through different settings like some holiday lights do. It should change the setting every time the button is pressed. Below are some example settings.
- Off
- Solid
- Blinking
- Pulsing (fading in and out)
- Different speeds of blinking, pulsing, or alternating
- Alternating which lights are on
--
You're on your own for this one!
- Network programming with ESP8266
- LEDs (Light Emitting Diodes)
- Buttons
- Servos
Take your servo and add one of the attachments to it
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var servo = new five.Servo(11);
this.repl.inject({
servo: servo
});
});node servo.js
Type these commands in the REPL and watch how the servo reacts
> servo.to(10); // Move to 10 degrees
> servo.to(200); // Move to 200 degrees
> servo.value; // Get current position
> servo.min();
> servo.max();
> servo.range;
> servo.center();
> servo.sweep();Now that you've got the basics of servos, you can either move on to the next component, or work on some servo challenges
Press → to move on to the next component Press ↓ to scroll through the servo challenges
--
Try to solve them yourself before looking at the solution!
Press ↓ to scroll through the following challenges (and potential solutions)
- Sprinkler
- Arrows
- Button
--
Make the servo rotate back and forth like a sprinkler
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var servo = new five.Servo(11);
var min = servo.range[0];
var max = servo.range[1];
var value = min;
function step() {
servo.to(value);
value = (value + 45) % max;
setTimeout(step, 500);
}
step();
});--
Make pressing the left arrow button rotate the servo one way and pressing the right arrow button rotate the other way
--
--
var five = require("johnny-five");
var keypress = require("keypress");
var board = new five.Board();
board.on("ready", function() {
var servo = new five.Servo(11);
process.stdin.on("keypress", function(ch, key) {
if (key && key.name === "left") {
servo.min();
} else if (key && key.name === "right") {
servo.max();
}
});
process.stdin.setRawMode(true);
process.stdin.resume();
});--
Have the servo sweep while a button is held down
--
--
var five = require("johnny-five");
var board = new five.Board();
board.on("ready", function() {
var servo = new five.Servo(11);
var button = new five.Button(2);
button.on("press", function() {
servo.sweep();
});
button.on("release", function() {
servo.stop();
});
});Uh oh! We ran out of slides! Feel free to try out some of the other components in your kit while we add more!
- Thank you for coming!
- We'd love your feedback: bit.ly/cubantech-nodebots-feedback
- Please put away kits (you can buy your own here)