The SHT4x Trinkey does not have built-in WiFi, but that won't stop this board from joining the internet of things! Since its designed to be most at home in a USB port, it can be used alongside a desktop CPython script.
In this example, the Trinkey runs code that reads temperature and humidity data from the SHT4x sensor. The CPython script sends the data coming in on the USB port to Adafruit IO.
Adafruit IO Prep
Before running this script, you'll need to setup an Adafruit IO account. This getting started guide will help you through that process and help you to become familiar with how Adafruit IO works.
CPython SHT4x Trinkey Adafruit IO Code
To run the script you will need a desktop or laptop computer with Python 3 installed.
# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
#
# SPDX-License-Identifier: MIT
# Written by Liz Clark (Adafruit Industries) with OpenAI ChatGPT v4 Feb 13, 2024 build
# https://help.openai.com/en/articles/6825453-chatgpt-release-notes
# https://chat.openai.com/share/79f4ba33-c045-4fbb-b468-3625f5622b8b
import time
from threading import Thread, Lock
import serial
from Adafruit_IO import Client, Feed
# Configuration
com_port = 'COM123' # Adjust this to your COM port
baud_rate = 115200
io_delay = 5
# Set to your Adafruit IO key.
# Remember, your key is a secret,
# so make sure not to publish it when you publish this code!
ADAFRUIT_IO_KEY = 'your-io-key-here'
# Set to your Adafruit IO username.
# (go to https://accounts.adafruit.com to find your username)
ADAFRUIT_IO_USERNAME = 'your-io-username-here'
# Shared buffer for sensor data
sensor_data = {'temperature': 0, 'humidity': 0}
data_lock = Lock()
stop_signal = False # Shared stop signal
print("Connecting to Adafruit IO...")
# Create an instance of the REST client.
aio = Client(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)
print("Connected!")
try:
sht4x_temp = aio.feeds('temp-feed')
except: # pylint: disable = bare-except
feed = Feed(name='temp-feed')
sht4x_temp = aio.create_feed(feed)
try:
sht4x_humid = aio.feeds('humid-feed')
except: # pylint: disable = bare-except
feed = Feed(name='humid_feed')
sht4x_humid = aio.create_feed(feed)
def read_sensor_data(ser):
while not stop_signal:
line = ser.readline().decode('utf-8').strip()
temperature, humidity = line.split(',')
with data_lock:
sensor_data['temperature'] = temperature
sensor_data['humidity'] = humidity
time.sleep(1)
def send_data_to_io():
while not stop_signal:
time.sleep(io_delay) # Adjust timing as needed
with data_lock:
temperature = sensor_data['temperature']
humidity = sensor_data['humidity']
aio.send_data(sht4x_temp.key, temperature)
aio.send_data(sht4x_humid.key, humidity)
print(f"Logged: Temperature={temperature}°C, Humidity={humidity}%")
def main():
global stop_signal # pylint: disable = global-statement
try:
with serial.Serial(com_port, baud_rate, timeout=1) as ser:
print("Starting data logging to Adafruit IO... Press Ctrl+C to stop.")
sensor_thread = Thread(target=read_sensor_data, args=(ser,))
io_thread = Thread(target=send_data_to_io)
sensor_thread.start()
io_thread.start()
while True:
time.sleep(0.1)
except KeyboardInterrupt:
print("\nShutting down...")
stop_signal = True
finally:
sensor_thread.join()
io_thread.join()
print("Data logging stopped.")
if __name__ == '__main__':
main()
SHT4x Trinkey Code
The code running on the Trinkey is the basic temperature and humidity Arduino demo. It has been compiled into a convenient .UF2 file that you can drag and drop onto the Trinkey.
CPython Dependencies
First, you'll use pip to install the Python libraries required to run the script:
pip install pyserial pip install adafruit-io
Customize the Script
Open the sht4x_trinkey_io.py script in your preferred text editor or IDE. At the top of the code, you'll need to update com_port to match the COM port that your Trinkey is plugged into. Otherwise, the script will not work.
You'll also need to update ADAFRUIT_IO_USERNAME and ADAFRUIT_IO_KEY with your Adafruit IO username and key.
# Configuration com_port = 'COM123' # Adjust this to your COM port baud_rate = 115200 io_delay = 5 # Set to your Adafruit IO key. # Remember, your key is a secret, # so make sure not to publish it when you publish this code! ADAFRUIT_IO_KEY = 'your-io-key-here' # Set to your Adafruit IO username. # (go to https://accounts.adafruit.com to find your username) ADAFRUIT_IO_USERNAME = 'your-io-username-here'
Update the COM port and Adafruit IO account information before running the script!
Run the Script
After adding your COM port and Adafruit IO account information, you can run the sht4x_trinkey_io.py script inside a terminal window on your computer with:
python sht4x_trinkey_io.py
As the script runs, you'll see the temperature and humidity readings from the SHT4x Trinkey print to your terminal window as they are logged to Adafruit IO. You can monitor the data on Adafruit IO with a dashboard or by viewing the individual temperature and humidity feeds. You can press Ctrl+C on your keyboard to stop the script in the terminal window.
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