Use an STM32F103C8T6 ("Blue Pill") with the Arduino IDE!

1/*
2 * Use STM32 "blue pill" board to read a DHT22 temperature and  humidity sensor
3 * (and wink a LED.)
4 * 
5 * Paul M Dunphy VE1DX
6 * April  2020
7 * 
8 */
9
10#include <DHT.h>   // Adafruit Unified Sensor version  1.3.8
11
12#define DHTPIN PA1  // Physical pin 11
13
14#define DHTTYPE DHT22
15
16int  LEDpin = PA8;  // Physical pin 29
17
18DHT dht(DHTPIN, DHTTYPE);  // Initilize  object dht for class DHT 
19                           // with DHT pin with STM32  and DHT type as DHT22
20
21void setup() 
22{
23  pinMode(LEDpin, OUTPUT);
24  Serial.begin(9600);
25  dht.begin();          // Initialize DHT22 to read Temperature  and humidity values.                        
26  delay(3000);          // Wait  3 seconds for it to stabilize
27}
28
29
30void loop()
31{
32  
33  int i;
34  
35  for (int i = 1; i <= 8; i++) // Wink LED before reading for no good reason
36                               // other than to wait between readings
37  {
38    digitalWrite(LEDpin, HIGH);
39    delay(250);
40    digitalWrite(LEDpin, LOW);
41    delay(250);
42  }
43  
44  float h = dht.readHumidity();       // Get Humidity  value
45  float t = dht.readTemperature();    // Get Temperature value
46
47  Serial.print(t,1);                  // Print to serial monitor screen
48  Serial.print("      ");  
49  Serial.print(h,1);   
50  Serial.println();
51  
52  digitalWrite(LEDpin,  LOW);
53  delay(1000);
54}