... check, if pins you use are able for pwm... .I use D1 and D2 at D1 mini, but mcu may b different. Probably, you need d1 As D1Pins library for mcu too (Private d1 As D1Pins). So you dont initialize Softserial1.Initialize(57600, 1,2) but Softserial1.Initialize(57600, d1.d1,d1.d2)