ESP-01 Deep Sleep not waking up properly I have a temperature/humidity project using an ESP-01 and DHT11.  I want to be able to put t into deep sleep to preserve battery life.  I have soldered a wire from GPIO16 to RST.  

#include &lt;SimpleTimer.h&gt;  //https://github.com/jfturcot/SimpleTimer
#include &lt;ESP8266WiFi.h&gt;
#include &lt;PubSubClient.h&gt;  //https://github.com/knolleary/pubsubclient
#include &lt;ESP8266mDNS.h&gt; 
#include &lt;WiFiUdp.h&gt;
#include &lt;ArduinoOTA.h&gt;  //https://github.com/esp8266/Arduino/tree/master/libraries/ArduinoOTA
#include "DHT.h"

//USER CONFIGURED SECTION START//
#define DHTPIN 2     // what digital pin we're connected to

const char* ssid = "mySSID";
const char* password = "password";
const char* mqtt_server = "mqttserverip";
const int mqtt_port = 1883;
const char *mqtt_user = "usser";
const char *mqtt_pass = "pass";
const char *mqtt_client_name = "DryerMCU"; // Client connections can't have the same connection name
//USER CONFIGURED SECTION END//

// Uncomment whatever type you're using!
#define DHTTYPE DHT11   // DHT 11
//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors.  This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);


WiFiClient espClient;
PubSubClient client(espClient);
SimpleTimer timer;

bool boot = true;
int status = WL_IDLE_STATUS;

//Functions
void setup_wifi() 
{
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) 
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void getTemperature()
{
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");


  char temperature[50];
  char humidity[50];

   // Update temperature and humidity
  String temp_str = String(f);
  temp_str.toCharArray(temperature, temp_str.length() + 1);
  client.publish("dryer/temperature", temperature);

  String hum_str = String(h);
  hum_str.toCharArray(humidity, hum_str.length() + 1);
  client.publish("dryer/humidity", humidity);

}

void setup() {
  Serial.begin(38400);
  delay(2000);
  Serial.println("Booting");

  dht.begin();
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
  getTemperature();

  Serial.println("Going to sleep");
  ESP.deepSleep(10000000,RF_DEFAULT);
}

void loop() {

}


When I start it up it takes one measurement, goes to sleep and then wakes up, but nothing happens once it wakes up.  Serial output:

Booting

Connecting to SSID
  ...... 
WiFi connected  
IP address: 
mqttip  
Humidity: 51.00 %   Temperature: 20.00 *C 68.00 *F  Heat index: 19.39 *C 66.90 *F  
Going to sleep

ets Jan  8 2013,rst cause:5, boot mode:(3,7)

ets_main.c
In the question the OP said:


  I have soldered a wire from GPIO16 to RST.


But, I'm going to post an answer for the people who find this question and need the ESP-01 modification instructions in order to wake an ESP-01 module up from deep-sleep:

The ESP8266 mounted on an ESP-01 board will not wake up from deep-sleep because the ESP8266 wake up signal is not connected to the reset pin of the ESP8266 on an ESP-01 board.  You need to add this connection which can be difficult for most people.  You can see the modification in this picture:

...which comes from this instructables posting. 

If this is too difficult, consider using a different ESP8266 board which brings these ESP8266 pins to board edge connectors.