How to Build Internet-Connected Electronics Projects - Tutorial breadboard pics

Guides
1

regarding the above tutorial - you reference to pictures of the breadboard circuit for the light sensor. Any chance you can put them up? or are you referencing to the main picture?
Thank you for the tutorials they are very well presented.

2

Hi Ross,

The breadboard is shown in the main picture. Do you need something a little bit clearer?

3

Yes please.

Kind Regards

Ross

4

Hi Ross,

You it’s something like this:

pycomDia
pycomDia.png800×800 79.4 KB

5

Thankyou heaps.

Kind Regards

Ross

6

Not sure if this was an issue but i couldn’t get the ‘colour’ to work when i changed it via adafruit.io. Then i noticed that the US spelling of ‘colour’ is ‘color’, i changed the code and it works now. Thank you for your efforts in putting together this project…very well delivered.

import time
import pycom
import machine
import ubinascii
from network import WLAN
from machine import Timer
from umqtt import MQTTClient

SETTINGS

YOU NEED TO CHANGE THESE SETTINGS!

AIO_USER = “rossdem699”
AIO_KEY = “aa047a63092349ef8f48154967194b54”

These settings are ok

WIFI_SSID = “TPG-RIKL”
WIFI_PASS = “CoreChris” # No this is not our regular password. :slight_smile:

WIFI_PASS = “79Password#” # No this is not our regular password. :slight_smile:

AIO_SERVER = “io.adafruit.com”
AIO_PORT = 1883
AIO_CLIENT_ID = ubinascii.hexlify(machine.unique_id()) # Can be anything
AIO_CONTROL_FEED = AIO_USER + “/feeds/control”
AIO_COLOUR_FEED = AIO_USER + “/feeds/color”
AIO_LIGHT_FEED = AIO_USER + “/feeds/light”

led_colour = 0xFFFFFF # White

def send_to_aio(feed, value):

value_string = str(value)
print("Publishing: {0} to {1} ... ".format(str(value_string), feed), end='')
try:
    adafruit_io.publish(topic=feed, msg=str(value_string))
    print("DONE")
except Exception as e:
    print("FAILED")

Function to respond to messages from Adafruit IO

def sub_cb(topic, msg): # sub_cb means “callback subroutine”
global led_colour

print("io.adafruit.com says: {} {}".format(topic, msg))          # Outputs the message that was received. Debugging use.

if b'control' in topic:
# if topic == b'CoreChris/feeds/control':
    if msg == b'ON':
        pycom.rgbled(led_colour)
    else:
        pycom.rgbled(0x000000)

if b'color' in topic:
# if topic == b'CoreChris/feeds/colour':
    led_colour = int(msg[1:], 16)
    pycom.rgbled(led_colour)

pycom.heartbeat(False)
adc = machine.ADC() # create an ADC object
apin = adc.channel(pin=‘P13’) # create an analog pin on P16

CONNECT TO WIFI

We need to have a connection to WiFi for Internet access

Code source: https://docs.pycom.io/chapter/tutorials/all/wlan.html

print("Connecting to WiFi … ", end=’’)
wlan = WLAN(mode=WLAN.STA)
wlan.connect(WIFI_SSID, auth=(WLAN.WPA2, WIFI_PASS), timeout=5000)

while not wlan.isconnected(): # Code waits here until WiFi connects
machine.idle()

print(“done.”)

CONNECT TO ADAFRUIT IO

Use the MQTT protocol to connect to Adafruit IO

adafruit_io = MQTTClient(AIO_CLIENT_ID, AIO_SERVER, AIO_PORT, AIO_USER, AIO_KEY)
adafruit_io.set_callback(sub_cb)
adafruit_io.connect()
adafruit_io.subscribe(AIO_CONTROL_FEED)
adafruit_io.subscribe(AIO_COLOUR_FEED)

while(True):
light_level = 4095 - apin()

send_to_aio(AIO_LIGHT_FEED, light_level)
for x in range(0,49):
    adafruit_io.check_msg()
    time.sleep(0.1)
1 Like
7

Hi Ross,

That color-colour thing gets me sometimes too.