SunFounder ESP32

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SunFounder ESP32 Starter Kit

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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