The first reading

/*
  NTC Thermistor - first reading                         TK12 / /p/tk12

  Wiring. Count from the square pad on the TinkerBlock board, parts
  up, header at the bottom:

    GND    -> GND
    VCC    -> 5V on an Uno; 3V3 on an ESP32, ESP32-S3 or Pico
              (SIGNAL is a fraction of VCC, so it stays in range)
    NC     -> nothing   (unconnected on the board)
    SIGNAL -> A0 on an Uno, GPIO 34 on an ESP32, GPIO 4 on an
              ESP32-S3, GP26 on a Raspberry Pi Pico

  Arduino IDE
    Tools > Board                 your board, e.g. Arduino Uno
    Tools > Port                  the one that appears when you plug in
    Tools > USB CDC On Boot       Enabled   (ESP32-S3 only)
    No library needed.
*/

// The analog pin SIGNAL is wired to.
// Uno: A0. ESP32: 34. ESP32-S3: 4. Pico: 26.
const int SENSOR_PIN = A0;

void setup() {
  Serial.begin(115200);
}

void loop() {
  int count = analogRead(SENSOR_PIN);   // warmer means lower

  Serial.print("count ");
  Serial.println(count);
  delay(500);                           // twice a second
}

"""
  NTC Thermistor - first reading, MicroPython         TK12 / /p/tk12

  Wiring. Count from the square pad on the TinkerBlock board, parts
  up, header at the bottom:

    GND    -> GND
    VCC    -> 3V3   (SIGNAL is a fraction of VCC)
    NC     -> nothing   (unconnected on the board)
    SIGNAL -> GPIO 34 on an ESP32, GPIO 4 on an ESP32-S3,
              GP26 on a Raspberry Pi Pico

  Thonny
    Run > Configure interpreter   MicroPython (ESP32) or
                                  MicroPython (Raspberry Pi Pico)
    Save it to the board as main.py to run it on every power-up.
    Nothing to install: machine, sys and time are built in.
"""

import sys
import time
from machine import ADC, Pin

# The GPIO number SIGNAL is wired to. ESP32: 34. ESP32-S3: 4. Pico: 26.
SENSOR_PIN = 4

adc = ADC(Pin(SENSOR_PIN))
if sys.platform == "esp32":           # ESP32 and ESP32-S3
    adc.atten(ADC.ATTN_11DB)          # the full range, to about 3.1 V

while True:
    print("count", adc.read_u16())    # warmer means lower
    time.sleep_ms(500)