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Kind of desperate here. I tried every solution found on this forum / google and others. My sketch works perfectly with a NodeMCU 1.0 The same script should work on a Lolin Mini D1, everything works except the wake up after deep sleep. Wiring is clearly identical.

That pinMode(D0, WAKEUP_PULLUP) is the latest addition, found in a post here. Nothing changed.

The program reads the values from a sensor and then goes to sleep. Changing the sleep mode does not chenge the results. In ESP.deepSleep I tried every possible value I found around. No luck.

After the 15 seconds the built led flashes, something weird appears in the serial monitor, and then the only solution is the reset button.

I even thought it was bad soldering, so I tested the RST with an external pushbutton and the D0 with a led. Electrically it's allright. If I press the external pushbutton (NOT the builtin) the D1 mini resets.

Any help super appreciated.

enter image description here

#define LED D4 // built in led on board
#define RED_LED D2
#define WHITE_LED D1
#define DHTPIN D7 // Digital pin connected to the DHT sensor 
#define DHTTYPE DHT22 // DHT 22 (AM2302)
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#include <DHT.h> 
#include <DHT_U.h>
// WiFi parameters to be configured
const char* ssid = "hfghjfjfghj"; // Write here your router's username
const char* password = "fghjfghjf"; // Write here your router's passward
DHT dht(DHTPIN, DHTTYPE);
void setup(void)
{ 
 pinMode(LED, OUTPUT); // LED pin as output.
 pinMode(RED_LED, OUTPUT); // LED pin as output.
 pinMode(WHITE_LED, OUTPUT); // LED pin as output.
 pinMode(D0, WAKEUP_PULLUP); // doesn't change anything
 
 Serial.begin(115200); // or 9600
 while(!Serial) {}
 Serial.println("xx"); // this starts a new line in the console after all the rubbish during the connection
 Serial.println("Connecting to WiFi");
 // Connect to WiFi
 digitalWrite(RED_LED, LOW);
 digitalWrite(WHITE_LED, LOW);
 digitalWrite(LED, HIGH); // this actually switches OFF
 
 WiFi.begin(ssid, password);
 // while wifi not connected yet, print '.'
 int k = 0;
 while (WiFi.status() != WL_CONNECTED) {
 digitalWrite(LED, HIGH);
 delay(100);
 digitalWrite(LED, LOW);
 delay(100);
 }
 
 // Print the IP address
 Serial.println(WiFi.localIP());
 
 dht.begin();
}
void go_to_sleep(float minutes) {
 blink_times(LED,5,30);
 Serial.print("Now going to sleep for ");
 long msecs = minutes * 60 * 1000 * 1000;
 Serial.print(msecs);
 Serial.println(" microseconds");
 ESP.deepSleep(msecs, WAKE_RF_DEFAULT); // or WAKE_RF_DISABLED, doesn't work either
}
void loop() {
 Serial.println("Main loop");
 delay(2000); // Wait a few seconds between measurements
 float humidity = dht.readHumidity(); 
 float temperature = dht.readTemperature(); 
 if (isnan(humidity) || isnan(temperature)) { 
 Serial.println("Failed to read from DHT sensor!"); 
 return; 
 } 
 Serial.print("Humidity: "); 
 Serial.print(humidity); 
 Serial.print(" %\t"); 
 Serial.print("Temperature: "); 
 Serial.print(temperature); 
 Serial.println(" *C");
 go_to_sleep(0.25);
}