My code can be compiled either as a "Mobile" node, for a Loco, or as a Static" node for use for track sensors and points etc.
The Loco version can use either a standard RC controller to control the motor or a PWM (L293 type) interface. The Loco has front and back lights and sound effects courtesy of Earle Philhowers ESP audio codelibrary.
This is a video https://www.youtube.com/watch?v=Pg5r6MZDhww of it running (using Rocrail web interface on the tablet).
The 8 I/O on the (static) esp can all be selected as either inputs or outputs using the Rocnet interface in Rocrail. I use one ESP per "station" on a garden railway, which has two sensors per station and two points, and two controlled lights outputs for the station lamps. I use the NodeMCU motor shield as it provides a simple way to connect sensors and servos. (But it does need modification to get 5V to the servos).
On the Mobile version, there are less I/O available as some are used for audio and others for the motor controls and lights.
The code is available on github: https://github.com/dagnall53/ESPMQTTRocnetSound.
Once uploaded to an ESP (nodeMCU or Wemos) the code can be updated over wifi, and the sound effects can be changed or updated using FTP over WiFi.
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