add discalimer

mandulaj · Dec 17, 2019 · f713ab4 · f713ab4
1 parent 8a919b7
commit f713ab4
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/README.md b/README.md
@@ -5,6 +5,8 @@ Arduino communication library for Peacefair PZEM-004T-10A and PZEM-004T-100A v3.
 
 This module is an upgraded version of the PZEM-004T with frequency and power factor measurement features, available at the usual places. It communicates using a TTL interface over a Modbus-RTU like communication protocol but is incompatible with the older [@olehs](https://github.com/olehs) library found here: [https://github.com/olehs/PZEM004T](https://github.com/olehs/PZEM004T). I would like to thank [@olehs](https://github.com/olehs) for the great library which inspired me to write this one.
 
+# Common issue:
+Make sure the device is connected to the AC power! The 5V only power the optocouplers, not the actual chip. Also please be safe, AC is dangerous. It can cause more serious issues, such as death. You are responsible for your own stupidity. So don't be stupid.
 
 ### Manufacturer (optimistic) specifications