Temporary fix for Adafruit DHT library bug reported here: https://github.com/adafruit/DHT-sensor-library/issues/62

code/platformio.ini

@@ -4,7 +4,7 @@ env_default = node-debug
 [env:sonoff-debug]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSONOFF
@@ -12,7 +12,7 @@ build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSONOFF
 [env:sonoff-debug-ota]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSONOFF
@@ -23,7 +23,7 @@ upload_flags = --auth=fibonacci --port 8266
 [env:slampher-debug]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSLAMPHER
@@ -31,7 +31,7 @@ build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSLAMPHER
 [env:slampher-debug-ota]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSLAMPHER
@@ -42,7 +42,7 @@ upload_flags = --auth=fibonacci --port 8266
 [env:s20-debug]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DS20
@@ -50,7 +50,7 @@ build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DS20
 [env:s20-debug-ota]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DS20
@@ -61,7 +61,7 @@ upload_flags = --auth=fibonacci --port 8266
 [env:node-debug]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = nodemcuv2
 build_flags = -DNODEMCUV2 -DDEBUG_PORT=Serial
@@ -69,7 +69,7 @@ build_flags = -DNODEMCUV2 -DDEBUG_PORT=Serial
 [env:node-debug-ota]
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = nodemcuv2
 build_flags = -DNODEMCUV2 -DDEBUG_PORT=Serial
@@ -83,7 +83,7 @@ upload_flags = --auth=fibonacci --port 8266
 topic = /home/cellar/airconditioner/ip
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DS20
@@ -95,7 +95,7 @@ upload_flags = --auth=fibonacci --port 8266
 topic = /home/cellar/washer/ip
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 upload_speed = 115200
@@ -107,7 +107,7 @@ build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSONOFF -DENABLE
 topic = /home/studio/lamp/ip
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSONOFF
@@ -119,7 +119,7 @@ upload_flags = --auth=fibonacci --port 8266
 topic = /home/living/lamp/ip
 platform = espressif8266
 framework = arduino
-lib_install = 19,44,64,89,549,727
+lib_install = 19,31,44,64,89,549,727
 extra_script = pio_hooks.py
 board = esp01_1m
 build_flags = -Wl,-Tesp8266.flash.1m256.ld -DDEBUG_PORT=Serial -DSONOFF

code/src/dht.ino

@@ -10,6 +10,7 @@ Copyright (C) 2016 by Xose Pérez <xose dot perez at gmail dot com>
 #if ENABLE_DHT
 
 #include <DHT.h>
+#include <Adafruit_Sensor.h>
 
 DHT dht(DHT_PIN, DHT_TYPE, DHT_TIMING);