This project displays the data from a PiicoDev Atmospheric Sensor (BME280) on both a PiicoDev OLED Display Module (128x64) SSD1306 and terminal i.e temperature, pressure and relative humidity. It takes a reading every 60 seconds but here is the really neat part - it takes the reading exactly on the minute. The date/time the reading is taken is displayed at the top. Note on the OLED display the seconds scroll off the screen but not to worry because we know it is “00”.
Wish I could show you a photo but it looks like this.
2022-02-13 11:59:00
22.0 degC
1007.3 hPa
64.0 %RH
As well as loading the libraries the files font-pet-me-128.dat and PiicoDev_Unified.py are required in the project directory.
When the code runs do not be surprised if nothing displays immediately. The code is waiting for the minute to tick over.
# This project displays the data from a PiicoDev Atmospheric Sensor (BME280)
# on both a PiicoDev OLED Display Module (128x64) SSD1306 and terminal
# Courtesy Chris Barlow
from PiicoDev_BME280 import PiicoDev_BME280
from PiicoDev_SSD1306 import *
from datetime import datetime
from time import sleep
display = create_PiicoDev_SSD1306()
BME280Sensor = PiicoDev_BME280(t_mode=2, p_mode=5, h_mode=1, iir=2)
while True:
today = datetime.now()
delay = 60.0 - (today.second + (today.microsecond/1000000))
sleep(delay) # wait for new minute
today = datetime.now()
today_str = today.strftime("%Y-%m-%d %H:%M:%S")
BME280Temp, presPa, humRH = BME280Sensor.values()
pres_hPa = presPa / 100
# Print the data on the terminal
print(today_str)
print(str("{:.2f}".format(BME280Temp) + " degC"))
print(str("{:.1f}".format(pres_hPa) + " hPa"))
print(str("{:.1f}".format(humRH) + " %RH"))
print("----------")
# Print the data on the display
display.fill(0)
display.text(today_str, 0,0, 1)
display.text(str("{:.1f}".format(BME280Temp) + " degC"), 0,16, 1)
display.text(str("{:.1f}".format(pres_hPa) + " hPa"), 0,32, 1)
display.text(str("{:.1f}".format(humRH) + " %RH"), 0,48, 1)
display.show()
