SunFounder ESP32 Starter Kit
(continued from previous page)
import time
import math
# Define the beta value of the thermistor, typically provided in the datasheet
beta = 3950
# Create an ADC object (thermistor)
thermistor = ADC(Pin(35, Pin.IN))
# Set the attenuation
thermistor.atten(thermistor.ATTN_11DB)
lcd = LCD()
# Start an infinite loop to continuously monitor the temperature
while True:
# Read the voltage in microvolts and convert it to volts
Vr = thermistor.read_uv() / 1000000
# Calculate the resistance of the thermistor based on the measured voltage
Rt = 10000 * Vr / (3.3 - Vr)
# Use the beta parameter and resistance value to calculate the temperature in Kelvin
temp = 1 / (((math.log(Rt / 10000)) / beta) + (1 / (273.15 + 25)))
# Convert to Celsius
Cel = temp - 273.15
# Convert to Fahrenheit
Fah = Cel * 1.8 + 32
# Print the temperature values in both Celsius and Fahrenheit
print('Celsius: %.2f C Fahrenheit: %.2f F' % (Cel, Fah))
# Clear the LCD screen
lcd.clear()
# Display the temperature values in both Celsius and Fahrenheit
lcd.message('Cel: %.2f \xDFC \n' % Cel)
lcd.message('Fah: %.2f \xDFF' % Fah)
time.sleep(1)
392 Chapter 3. For MicroPython User
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