import time import machine from gfx_pack import GfxPack from breakout_bme68x import BreakoutBME68X, STATUS_HEATER_STABLE """ GFX temp DEMO This demo uses a BME680 or BME688 attached to the QWST connector to measure temperature, pressure, and humidity and display it on the GFX display, or the internal temperature sensor can be used in place of the BME68x breakout. Just change use_bme68x_breakout to False """ # Settings lower_temp_bound = 15 upper_temp_bound = 30 use_bme68x_breakout = True sensor_temp = machine.ADC(4) conversion_factor = 3.3 / (65535) # used for calculating a temperature from the raw sensor reading gp = GfxPack() gp.set_backlight(0, 0, 0) # turn the RGB backlight off display = gp.display display.set_backlight(0.4) # set the white to a low value if use_bme68x_breakout: bmp = BreakoutBME68X(gp.i2c) display.set_pen(0) display.clear() display.set_font("bitmap14_outline") while True: # Clear display display.set_pen(0) display.clear() display.set_pen(15) display.text("GFXPack Temp demo", 0, 0, scale=0.1) if use_bme68x_breakout: temperature, pressure, humidity, gas, status, _, _ = bmp.read() display.text("Temp: {:0.2f}c".format(temperature), 0, 20, scale=0.2) display.text("Press: {:0.2f}Pa".format(pressure), 0, 35, scale=0.2) display.text("Humid: {:0.2f}%".format(humidity), 0, 50, scale=0.2) heater = "Stable" if status & STATUS_HEATER_STABLE else "Unstable" print("{:0.2f}c, {:0.2f}Pa, {:0.2f}%, {:0.2f} Ohms, Heater: {}".format( temperature, pressure, humidity, gas, heater)) else: reading = sensor_temp.read_u16() * conversion_factor temperature = 27 - (reading - 0.706) / 0.001721 display.text("Temperature", 25, 15, scale=0.2) display.text("{:0.2f}c".format(temperature), 25, 30, scale=2) if temperature < lower_temp_bound: r = 0 b = 255 elif temperature > upper_temp_bound: r = 255 b = 0 else: r = (temperature - lower_temp_bound) / (upper_temp_bound - lower_temp_bound) * 255 b = 255 - ((temperature - lower_temp_bound) / (upper_temp_bound - lower_temp_bound) * 255) gp.set_backlight(r, 0, b) display.update() time.sleep(0.2)