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by sprobertson 3496 days ago
There are - two for power, two for the DHT sensor, two for RX TX, and you even have one left over (not counting reset pin)

I'm using serial from ATTiny85 to a ESP8266 as my wireless transmitter already: https://i.imgur.com/vZzGGZL.png but the ESP itself is probably the root of the power problem.