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+The Shelly 1PM is supported from Tasmota 6.5.0.10 using a template.
+
+<img src="https://shelly.cloud/wp-content/uploads/2019/02/shelly1pm_thumb.png" width="250" align="right" />
+
+* [Allterco Shelly 1PM Product Page](https://shelly.cloud/shelly-1pm-wifi-smart-relay-home-automation/)
+* [Allterco Shelly 1PM Shop](https://shelly.cloud/product/wifi-smart-home-automation-shelly-1pm-switch-relay/)
+
+## ⚠️️Special Shelly Attention⚠️️
+
+**Do not connect AC power and the serial connection at the same time** 
+The GND connection of the Shelly has a 50% chance of being connected to the live AC wire. Connecting serial with your PC will fry your PC.
+
+**Do not connect any additional sensors to serial pins.**
+It can at least destroy your Shelly!
+
+**Check the correct jumper position before connecting AC power to Shelly 1.**
+If the jumper is set to 12V you will destroy your Shelly!
+
+An ESP8266 with 2MB flash single relay device 42mm "round" in size.
+
+## Serial Flashing
+Shelly 1PM comes with a partially exposed programming/debug header which can be used to flash Tasmota on the device. A USB-to-UART adapter is needed as well as a reliable 3.3V with at least 350 mA drive capability. The following diagram shows the device pinout and power source voltage selection jumper.
+
+<img src="https://github.com/arendst/arendst.github.io/blob/master/media/shelly/shelly1pm-pinout-812x400.png" height="250" />
+
+## Template (requires Tasmota 6.5.0.10)
+```
+{"NAME":"Shelly 1PM","GPIO":[56,0,0,0,82,134,0,0,0,0,0,21,0],"FLAG":2,"BASE":18}
+```
+## Calibration
+Tasmota will disable serial logging after a restart as the communication between Tasmota and the Energy Monitoring chip is using the same serial interface. Make sure not to enable `SerialLog` as it will interfere with the Energy Monitoring functionality.
+
+To calibrate the Energy monitoring feature connect a known load and execute the commands shown below. Assumed an AC voltage of 240V, a resistive load of 60W and a line frequency of 50Hz. With a load of 60W the current should be 60W / 240V = 0.25A.
+```
+FrequencySet 50.000
+PowerSet 60.00
+VoltageSet 240.0
+CurrentSet 250.0
+```
+Pause a few seconds between executing the commands as the communication between Tasmota and the Energy Monitoring chip is a serial interface which can take over a second to complete.
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