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Seems your patches are ok. How do you power the shield? Which is your stepper? When I did bridge Vs and Vss on L293dd (what actually connect Vmotor and Vin) to both Enable pins I assumed that power supply is sufficient to power both, ESP & stepper. Don't know in your case, but if ESP does not work when connected, seems a power issue. I supose you have double check that D1 & D2 are connected to IN2 and IN4 only.
Done and working. Images worth more than words.In 3 steps: 1st remove two 102 resistors and "=4v" ic. 2nd on L293DD bridge pin 1 with 20, and 10 with 11, as 10 and 20 are both connected to Vm.3rd reuse the lower pads of removed resistors, as they are already connected to D1 and D2, wiring Pin 2(l293dd) with left resistor lower pad (D1) and Pin3(l293dd) with right resistor lower pad (D2).With this patch in place, the mod is hidden below NodeMCU so the result is safe.The final connections scheme is like attached table
Motorize IoT With ESP8266
Thanks Ehsmaes, Rudi48 & Grifter2 for your investigation, I lost 2 days testing different motors, ESP's and Shield configurations trying to drive a NEMA Stepper, finding weird signals at the Oscilloscope, thinking problems was me. My question is which resistors to remove. Rudi48 says 2nd and 5th, but starting from left or right? I guess are the ones with marking 102. I understand that one should also remove the 6pin little ic (marking =4v) that I couldn't find ist datasheet and was very suspictious to lower A+ / A- current. I don't know how to warn buyers that selling shops still advertise this Shield as capable of driving Steppers motors while is not (at least the version is being offered right now everywhere.
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