How do you get sensor data from a sonoff flasher with tasmoda and post on the dashboard ? What code do you put in the configuration file?
Try doing a search for sonoff tasmota using the magnifying glass at the top of this page 
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Also the Tasmota Wiki has full examples: https://github.com/arendst/Sonoff-Tasmota/wiki/Home-Assistant#dht22-sensor
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