diff --git a/README.md b/README.md
index a27e195..0beae30 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,12 @@ Note:
 
 #### Enable I2C and install smbus
 
+Update the system:
+
+```shell
+sudo apt update && sudo apt upgrade -y
+```
+
 To enable I2C:
 Open a terminal and run the command
 
@@ -155,6 +161,8 @@ Your Power Pi is now ready.
 
 ![Dashboard](Assests/dashboard_R3.PNG "UPS Monitoring Dashboard")
 
+If you are new to Node-Red, please checkout their Essentials [video](https://www.youtube.com/watch?v=ksGeUD26Mw0&list=PLyNBB9VCLmo1hyO-4fIZ08gqFcXBkHy-6) series.
+
 Open the Node-Red link in a browser. The link is usually:
 
 http://[IP of Raspberry Pi]:1880/
diff --git a/src/ups.py b/src/ups.py
index 270b2ba..8871e16 100644
--- a/src/ups.py
+++ b/src/ups.py
@@ -12,7 +12,7 @@
 
 logging.basicConfig(level=logging.INFO)
 
-USE_1WIRE = False
+GPIO4_AVAILABLE = True
 ENABLE_UDP = True
 UDP_PORT = 40001
 serverAddressPort   = ("127.0.0.1", UDP_PORT)
@@ -57,7 +57,7 @@ def main():
     if ppi.initialize():
         sys.exit(1)
 
-    if not USE_1WIRE:
+    if GPIO4_AVAILABLE:
         try:
             GPIO.setmode(GPIO.BCM)
             GPIO.setup(4, GPIO.IN, pull_up_down=GPIO.PUD_UP)