Category:

Code

Get the latest Bitcoin Price in Micropython

by 2b4a3pico71 August 12, 2024

In this example we will get the bitcoin price using micropython

We will use coingecko in this example, there are other apis that you can use

To test this out you can insert the following in your browser

https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd

You should see something like this

{"bitcoin":{"usd":59240}}

Complete example

I used thonny for development

import network
import requests
from time import sleep

# Wi-Fi credentials
ssid = 'ssid here'
password = 'password here'

# Request URL
url = 'https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=usd'

def init_wifi(ssid, password):# Init Wi-Fi Interface
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    # Connect to your network
    wlan.connect(ssid, password)
    # Wait for Wi-Fi connection
    connection_timeout = 10
    while connection_timeout > 0:
        if wlan.status() >= 3:
            break
        connection_timeout -= 1
        print('Waiting for Wi-Fi connection...')
        sleep(1)
    # Check if connection is successful
    if wlan.status() != 3:
        return False
    else:
        print('Connection successful!')
        network_info = wlan.ifconfig()
        print('IP address:', network_info[0])
        return True

if init_wifi(ssid, password):
    try:
        # Make the request
        response = requests.get(url)
        #Print the response code
        print('Response code: ', response.status_code)
        
        # Get response content
        bitcoin = response.json()
        # Close the request
        response.close()
        
        # Print bitcoin price
        bitcoin_price = bitcoin['bitcoin']['usd']
        print('Bitcoin price (USD): ', bitcoin_price)

    except Exception as e:
        # Handle any exceptions during the request
        print('Error during request:', e)

First of all you need to change the ssid and password in this

# Wi-Fi credentials 
ssid = 'ssid here' 
password = 'password here'

The rest of code is commented but one thing you might want to change is the cryptocurrency and the target currency.

If you open the REPL window in thonny when you run this example you should see something like this

>>> %Run -c $EDITOR_CONTENT
Connection successful!
IP address: 192.168.1.122
Response code: 200
Bitcoin price (USD): 59590

In this case we will look at the price of ethereum in UK pounds

So the first part that needs changed is this

# Request URL
url = 'https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=gbp'

Then we change the following

 # Get response content
ethereum = response.json()
# Close the request
response.close()

# Print bitcoin price
ethereum_price = ethereum['ethereum']['gbp']
print('Ethereum price (GBP): ', ethereum_price)

If you open the REPL window in thonny when you run t his example you should see something like this

>>> %Run -c $EDITOR_CONTENT
Connection successful!
IP address: 192.168.1.187
Response code: 200
Ethereum price (GBP): 2100.14

You can add an OLED or LCD to display the price as a future project idea

Links

You can visit https://www.coingecko.com/en/api to see everything that is available

Code

SHT31 humidity sensor and Raspberry Pi Pico example

by 2b4a3pico71 August 11, 2024

In this article we connect a SHT31 humidity sensor to a Raspberry Pi Pico and we will use Circuitpython for development

First of all lets take a look at our sensor

Sensor Information

The digital SHT3x humidity sensor series takes sensor technology to a new level. As the successor of the SHT2x series it sets the industry standard in humidity sensing.

The SHT3x humidity sensor series consists of a low-cost version with the SHT30 humidity sensor, a standard version with the SHT31 humidity sensor, and a high-end version with the SHT35 humidity sensor. Automotive grade versions are also available.

The SHT3x humidity sensor series combines multiple functions and various interfaces (I2C, analog voltage output) with a applications-friendly, very wide operating voltage range (2.15 to 5.5 V).

The SHT3x builds on a completely new and optimized CMOSens® chip, which allows for increased reliability and improved accuracy specifications.

The SHT3x offers a range of new features, such as enhanced signal processing, two distinctive and user-selectable I2C addresses, an alert mode with programmable humidity and temperature limits, and communication speeds of up to 1 MHz.

Features

Output : I²C, Voltage Out
Supply voltage range : 2.15 to 5.5 V
Energy consumption : 4.8µW (at 2.4 V, low repeatability, 1 measurement / s)
RH operating range : 0 – 100% RH
T operating range : -40 to +125°C (-40 to +257°F)
RH response time : 8 sec (tau63%)

Parts Required

Name	Link
Pico	Raspberry Pi Pico Development Board
SHT31D	SHT31-D digital temperature and humidity sensor module
Connecting cables	Aliexpress link Amazon.com link Ebay link

Schematic/Connection

Black for GND
Red for V+
Blue for SDA
Yellow for SCL

So color coded for ease of use, this layout shows a connection to the module

rp2040 and sht31

Code Example

We use Thonny for development

The following is based on a library from Adafruit , I copied the adafruit_sht31d.mpy library for this device to the lib folder on my Raspberry Pi Pico – https://circuitpython.org/libraries

This is the basic example which comes with the library

import time
import board
import adafruit_sht31d
import busio

i2c = busio.I2C(scl=board.GP1, sda=board.GP0) # uses board.SCL and board.SDA

sensor = adafruit_sht31d.SHT31D(i2c)

loopcount = 0
while True:
    print("\nTemperature: %0.1f C" % sensor.temperature)
    print("Humidity: %0.1f %%" % sensor.relative_humidity)
    loopcount += 1
    time.sleep(2)
    # every 10 passes turn on the heater for 1 second
    if loopcount == 10:
        loopcount = 0
        sensor.heater = True
        print("Sensor Heater status =", sensor.heater)
        time.sleep(1)
        sensor.heater = False
        print("Sensor Heater status =", sensor.heater)

Output

Here is what I saw in Thonny REPL window – your results will likely be different

Temperature: 18.9 C
Humidity: 53.4 %

Temperature: 23.3 C
Humidity: 56.0 %

Temperature: 23.7 C
Humidity: 58.8 %

Code

Control the onboard LED of the Pico W using a Web Server

by 2b4a3pico71 August 10, 2024

In this article we will show you how to control the onboard LED of the Pico W using a Web Server.

Code

At the most basic we simply create a html web page which will be served up when an IP address is assigned

We then supply 2 links, one is used to switch the on board LED on and other one is used to switch it off.

There is also debug in the shell, in my case Thonny which is useful for showing the assigned IP address and other debug

Again change the following to match your own Wifi setup

ssid = 'wifi name here'
password = 'wifi password here'

ssid = ‘wifi name here’
password = ‘wifi password here’

import network
import socket
import time
import machine


from machine import Pin


picoled = machine.Pin("LED", machine.Pin.OUT)


ssid = 'wifi name here'
password = 'wifi password here'


wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)


html = """<!DOCTYPE html>
<html>
<head> <title>Pico W LED toggle</title> </head>
<body> <h1>Pico W LED toggle</h1>
<p>PICO W LED toggle</p>
<p>
<a href='/light/on'>Turn Light On</a>
</p>
<p>
<a href='/light/off'>Turn Light Off</a>
</p>
<br>
</body>
</html>
"""


# Try and connect
max_retries = 10
while max_retries > 0:
if wlan.status() < 0 or wlan.status() >= 3:
break
max_retries -= 1
print('waiting for a connection...')
time.sleep(1)


# Handle connection error
if wlan.status() != 3:
raise RuntimeError('network connection failed')
else:
print('connected')
status = wlan.ifconfig()
print( 'ip = ' + status[0] )


# Open socket
myaddress = socket.getaddrinfo('0.0.0.0', 80)[0][-1]


mysocket = socket.socket()
mysocket.bind(myaddress)
mysocket.listen(1)


print('listening on', myaddress)


ledstate = ""


# Listen for connections
while True:
try:
myclient, myaddress = mysocket.accept()
print('client connected from', myaddress)


request = myclient.recv(1024)
print(request)


request = str(request)
led_on = request.find('/light/on')
led_off = request.find('/light/off')
print( 'led on = ' + str(led_on))
print( 'led off = ' + str(led_off))


if led_on == 6:
print("led is on")
picoled.value(1)
ledstate = "LED is ON"


if led_off == 6:
print("led is off")
picoled.value(0)
ledstate = "LED is OFF"


response = html + ledstate


myclient.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
myclient.send(response)
myclient.close()


except OSError as e:
myclient.close()
print('connection closed')

Now run the code and look at the shell window to get your IP address

This is what I saw in the Thonny REPL

waiting for a connection...
waiting for a connection...
waiting for a connection...
connected
Your ip address = 192.168.1.188
listening on ('0.0.0.0', 80)

Now using your favorite web browser visit that IP address and you should see something like this

pico-led-toggle

Click on the links and you can toggle the led on and off , if you look at the thonny shell there is debug

You can create buttons instead of links

Code

Create a basic Raspberry Pi Pico Web Server

by 2b4a3pico71 August 10, 2024

In this example we will create the most basic Web Server using a Raspberry Pi Pico W.

This Web Server will display a simple Web Page when we navigate to the IP address assigned to our Pico W. The HTML is embedded in the code

Code

Enter your wifi name and password in here

ssid = ‘my wifi name’
password = ‘my wifi password’

The HTML that is displayed is

html = """<!DOCTYPE html>
<html>
<head> <title>Pico W Web server</title> </head>
<body> <h1>Pico W Web server</h1>
<p>Hello World example</p>
</body>
</html>
"""

You can modify this and test the results, add extra lines, headings and any valid HTML

import network
import socket
import time


ssid = 'my wifi name'
password = 'my wifi password'


wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)


# The HTML that will be displayed
html = """<!DOCTYPE html>
<html>
<head> <title>Pico W Web server</title> </head>
<body> <h1>Pico W Web server</h1>
<p>Hello World example</p>
</body>
</html>
"""


# Wait for connection or failure
max_retries = 10
# 10 attempts of 1 second
while max_retries > 0:
if wlan.status() < 0 or wlan.status() >= 3:
break
max_retries -= 1
print('waiting for a connection...')
time.sleep(1)


# Handle a connection error
if wlan.status() != 3:
raise RuntimeError('network connection has failed')
else:
print('connected')
status = wlan.ifconfig()
print( 'Your ip address = ' + status[0] )


# Open a socket
addrinfo = socket.getaddrinfo('0.0.0.0', 80)[0][-1]


mysocket = socket.socket()
mysocket.bind(addrinfo)
mysocket.listen(1)


print('listening on', addrinfo)


# Listen for connection
while True:
try:
myclient, addrinfo = mysocket.accept()
print('client connected from', addrinfo)


request = myclient.recv(1024)
print(request)
# display the page
request = str(request)
response = html


myclient.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
myclient.send(response)
myclient.close()


except OSError as e:
myclient.close()
print('connection closed')

If you look at the shell window in Thonny you will see something like this

>> %Run -c $EDITOR_CONTENT
waiting for a connection...
waiting for a connection...
waiting for a connection...
waiting for a connection...
waiting for a connection...
waiting for a connection...
connected
Your ip address = 192.168.1.188
listening on ('0.0.0.0', 80)

In your favourite web browser type in the IP address and you will see something like this

picowebserver

When the page is displayed you will see the following in the shell

client connected from ('192.168.1.149', 49249)
b'GET / HTTP/1.1\r\nHost: 192.168.1.188\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\nAccept-Language: en-GB,en;q=0.5\r\nAccept-Encoding: gzip, deflate\r\nConnection: keep-alive\r\nUpgrade-Insecure-Requests: 1\r\n\r\n'
client connected from ('192.168.1.149', 49250)
b'GET /favicon.ico HTTP/1.1\r\nHost: 192.168.1.188\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0\r\nAccept: image/webp,*/*\r\nAccept-Language: en-GB,en;q=0.5\r\nAccept-Encoding: gzip, deflate\r\nConnection: keep-alive\r\n\r\n'
client connected from ('192.168.1.149', 56678)
b'GET / HTTP/1.1\r\nHost: 192.168.1.188\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\nAccept-Language: en-GB,en;q=0.5\r\nAccept-Encoding: gzip, deflate\r\nDNT: 1\r\nConnection: keep-alive\r\nUpgrade-Insecure-Requests: 1\r\nPragma: no-cache\r\nCache-Control: no-cache\r\n\r\n'
client connected from ('192.168.1.149', 56679)
b'GET /favicon.ico HTTP/1.1\r\nHost: 192.168.1.188\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0\r\nAccept: image/webp,*/*\r\nAccept-Language: en-GB,en;q=0.5\r\nAccept-Encoding: gzip, deflate\r\nDNT: 1\r\nConnection: keep-alive\r\nPragma: no-cache\r\nCache-Control: no-cache\r\n\r\n'

Code

Read a web page using a Raspberry Pi W

by 2b4a3pico71 August 10, 2024

In this article we will fetch a web page using a Raspberry Pi W running micropython, we will the display the source code of the web page in the REPL window

You need to download the latest micropython firmware, you can get this from the following link

https://micropython.org/download/rp2-pico-w/

The first step that you need to do is to flash the MicroPython Firmware onto the Raspberry Pi Pico W.

You will need to put the Pico in Bootloader mode by holding the “BOOTSEL” button down while connecting the Pico W to your machine.

You will see a drive appear on your PC called RPI-PI2, drag the uf2 firmware that you downloaded from the micropython link above.

I use Thonny for development

Code

Connects to your network using Wi-Fi with your network id and password

Gets the IP Address of the Google homepage and connects to the IP address using a Socket connection

Performs a GET request and prints the result in the Shell window, you will see an example later on in the article

import time
import network
import socket


ssid = 'your network id here'
password = 'your password here'


wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)


# Wait for connection or fail
connection_attempts = 10
# 10 attempts to connect at 1 second intervals
while connection_attempts > 0:
if wlan.status() < 0 or wlan.status() >= 3:
break
connection_attempts -= 1
print('waiting for a connection.')
time.sleep(1)


# Handle connection error
if wlan.status() != 3:
raise RuntimeError('network connection has failed')
else:
print('connected')
status = wlan.ifconfig()
print( 'ip = ' + status[0] )


# Get IP address for google
addressinfo = socket.getaddrinfo("google.com", 80)
address = addressinfo[0][-1]


# Create a socket and make a HTTP request
mysocket = socket.socket()
mysocket.connect(address)
mysocket.send(b"GET / HTTP/1.0\r\n\r\n")


# Print the response
print(mysocket.recv(1024))

This was what I saw in the REPL window

>>> %Run -c $EDITOR_CONTENT
connected
ip = 192.168.1.188
b'HTTP/1.0 200 OK\r\nDate: Mon, 12 Sep 2022 20:22:45 GMT\r\nExpires: -1\r\nCache-Control: private, max-age=0\r\nContent-Type: text/html; charset=ISO-8859-1\r\nServer: gws\r\nX-XSS-Protection: 0\r\nX-Frame-Options: SAMEORIGIN\r\nSet-Cookie: AEC=AakniGOy2HvUIOceSrSD2uqee5S7_1amHXoccZitXBkO_-NBcv6gNbAtrvE; expires=Sat, 11-Mar-2023 20:22:45 GMT; path=/; domain=.google.com; Secure; HttpOnly; SameSite=lax\r\nAccept-Ranges: none\r\nVary: Accept-Encoding\r\n\r\n<!doctype html><html itemscope="" itemtype="http://schema.org/WebPage" lang="en-GB"><head><meta content="text/html; charset=UTF-8" http-equiv="Content-Type"><meta content="/logos/doodles/2022/hm-queen-elizabeth-ii-6753651837109804.2-l.png" itemprop="image"><meta content="Queen Elizabeth II 1926 – 2022" property="twitter:title"><meta content="Queen Elizabeth II'

Basics Code

Arduino Nano RP2040 Connect RGB led examples

by 2b4a3pico71 August 9, 2024

In this article we look at the RGB led which is fitted on the Arduino Nano RP2040 Connect

The RGB LED (DL3) is a common anode LED that is connected to the Nina W102 module. The LED is off when the digital state is HIGH and on when the digital state is LOW.

rgb led

While using the BLE mode on the NINA module, the RGB cannot be used by default. While the module is in BLE mode, SPI is deactivated, which is used to control the RGBs.

We can see that the RGB led pins are connected to pins 16 to 18 on the UBlox NINA Module. So in order to use the RGB LED, we are going to have to go through this WiFi module.

ninapinout

Here is the physical location of the RGB led on the board

Parts Required

Name	Link
Nano RP2040 Connect.	Arduino Nano RP2040 Connect with Headers

Code Examples

You need to install the WifiNINA library

This must be installed from the Library Manager:

Click Tools -> Manage Libraries to open the Library Manager.
Search for WifiNINA and install the latest version of the library.

Blink the LED

#include <WiFiNINA.h>

void setup() 
{
  // Set LED Pins as Outputs
  pinMode(LEDR, OUTPUT);
  pinMode(LEDG, OUTPUT);
  pinMode(LEDB, OUTPUT);
}

void loop() 
{
  digitalWrite(LEDR,HIGH); // Turn On RED LED
  delay(500);
  digitalWrite(LEDR,LOW); // Turn Off RED LED

  digitalWrite(LEDG,HIGH); // Turn On GREEN LED
  delay(500);
  digitalWrite(LEDG,LOW); // Turn Off GREEN LED

  digitalWrite(LEDB,HIGH); // Turn On BLUE LED
  delay(500);
  digitalWrite(LEDB,LOW); // Turn Off BLUE LED
}

Fading LED

#include <WiFiNINA.h> 

int rgbRed = 0, dir=1; 

void setup() 
{ 
// Set the LED pins as outputs 
pinMode(LEDR, OUTPUT); 
} 

void loop() 
{ 
rgbRed = rgbRed + (1 * dir); 
if(rgbRed > 255) 
{ 
rgbRed = 255; 
dir = -1;
} 
if(rgbRed < 0) 
{ 
rgbRed = 0; 
dir = 1; 
} 
analogWrite(LEDR, rgbRed); 
delay(5); 
}

Random LED colors

#include <WiFiNINA.h> 

void setup() 
{ 
// Set the RGB pins to output 
pinMode(LEDR, OUTPUT); 
pinMode(LEDG, OUTPUT); 
pinMode(LEDB, OUTPUT); 
randomSeed(1); 
} 

void loop() 
{ 
// sets the value (range from 0 to 255) for 3 RGB channels: 
analogWrite(LEDR, random(255)); 
analogWrite(LEDB, random(255)); 
analogWrite(LEDG, random(255)); 
// wait for 500 milliseconds before changing the color again 
delay(500); 
}

Basics Code

Read the internal Temperature from a Raspberry Pi Pico

by 2b4a3pico71 August 9, 2024

In this tutorial we will read the Temperature from the Raspberry Pi Pico.

The Raspberry Pi Pico has an internal Temperature Sensor which is connected to an ADC pin, using Micropython or the Arduino IDE we can read this temperature

The internal temperature sensor that comes with the Raspberry Pi Pico is connected to one of the Analog-to-Digital Converters. The ADC pin supports a range of values, which is determined by the input voltage applied to the pin.

In the Raspberry Pi Pico Board, the ADC pins support 12-bits, which means that the value can go from 0 to 4095.

The MicroPython code though can scale the ADC values to a 16-bit range which means the range of values that are available are actually 0 to 65535. The microcontroller operates at 3.3 V, this means that an ADC pin will return a value of 65535 at 3.3 V or 0 when there is 0v. So with some simple code we can easily get the value.

raspberry-pi-pico-pinout

In the pinout above you can see the pins are labelled as ADC0 (31), ADC1(32), ADC2(34), and ADC_VREF(35), this is technically ADC3

If you looked at a pinout of the Raspberry pi Pico you may wonder which one of thes pins is actually the ADC pin well the temperature sensor does not connect to a physical pin on the board but is actually ADC4.

Parts Required

Just a Raspberry Pi Pico required for this one

Name	Link
Pico	Raspberry Pi Pico Development Board

Code Examples

2 code example, one for the Arduino IDE and one for Micropython

Micropython

import machine
import utime
 
sensor_temp = machine.ADC(4)
convert = 3.3 / (65535)
 
while True:
    reading = sensor_temp.read_u16() * convert
    temperature = 27 - (reading - 0.706)/0.001721
    print(temperature)
    utime.sleep(1)

We first convert the raw value to a voltage

convert = 3.3 / (65535)

From the RP2040 microcontroller datasheet, we see that a temperature of 27 degrees Celsius delivers a voltage of 0.706 V. With each degree the voltage reduces by 1.721 millivolts.

Hence we get this formula.

temperature = 27 - (reading - 0.706)/0.001721

And the output was

13.96637
13.96637
14.83275
15.2438

Arduino

If you have arduino support installed for the Raspberry Pi Pico then this all you need.

void setup() 
{
  Serial.begin(115200);
  delay(5000);
}

void loop() 
{
  Serial.printf("Core temperature: %2.1fC\n", analogReadTemp());
  delay(1000);
}

Open the serial monitor and you should see something like this

Core temperature: 15.9C
Core temperature: 15.9C
Core temperature: 16.2C
Core temperature: 17.1C
Core temperature: 17.3C

Basics Code

An I2C scanner for the Raspberry Pi Pico

by 2b4a3pico71 August 9, 2024

In this tutorial we will create an I2C scanner for the Raspberry Pi PIco.

Sometimes you get a sensor and are not sure the I2C address or you may have a sensor library that does not work for some reason and this may be because the sensor supports multiple I2C addresses and the default one in the library may be different from your hardware.

So you can upload an I2C scanner code example to your Pico, correctly connect your sensor and check the address that is displayed. It can certainly save a lot of time

Parts Required

Just a Raspberry Pi Pico required for this one

Name	Link
Pico	Raspberry Pi Pico Development Board

Code Examples

We have examples here for Micropython, Circuitpython and the Arduino IDE

Micropython

I used Thonny for this example

import machine

sda=machine.Pin(0)
scl=machine.Pin(1)

i2c=machine.I2C(0,sda=sda, scl=scl, freq=400000)
 
print('Scan i2c bus...')
devices = i2c.scan()
 
if len(devices) == 0:
  print("No i2c device !")
else:
  print('i2c devices found:',len(devices))
 
  for device in devices:  
    print("Decimal address: ",device," | Hexa address: ",hex(device))

CircuitPython

The very popular circuitpython from Adafruit, I used Thonny for this example

import board
import busio

i2c = busio.I2C(scl=board.GP1, sda=board.GP0)
count = 0

# Wait for I2C lock
while not i2c.try_lock():
    pass

# Scan for devices on the I2C bus
print("Scanning I2C bus")
for x in i2c.scan():
    print(hex(x))
    count += 1

print("%d device(s) found on I2C bus" % count)

# Release the I2C bus
i2c.unlock()

Arduino

If you have arduino support installed for the Raspberry Pi Pico then this all you need.

#include <Wire.h>

void setup()
{
  Wire.begin();
  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
}

void loop()
{
  byte error, address;
  int nDevices;

  Serial.println("Scanning...");

  nDevices = 0;
  for(address = 1; address < 127; address++ ) 
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4) 
    {
      Serial.print("Unknow error at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");

  delay(5000);           // wait 5 seconds for next scan
}

Code

Complete example

Links

Sensor Information

Features

Parts Required

Schematic/Connection

Code Example

Output

Code

Code

Code

Parts Required

Code Examples

Blink the LED

Fading LED

Random LED colors

Parts Required

Code Examples

Micropython

Arduino

Parts Required

Code Examples

Micropython

CircuitPython

Arduino

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