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The platform the software runs on is the Wemos D1 mini module with an ESP8266 micro-controller. Each decoder has its own PCB to put together the hardware components required for its function.
The hall sensor is placed into a “holder” on a small PCB with a connector.
A current detection circuit is contained on a PCB to create a single current sensor.
The original “EAGLE cad” files for the decoders, servo tool and sensors are together with the decoder software on Git.
I was requested to put here the link to the PCB-manufacturer I normally use. So, here it is:https://www.smart-prototyping.com
The Wemos module fits into two female pin-header strips. Orientation is with the USB connector to the left side for the decoders. For the servo tool the USB connector is at the bottom side. To verify the correct position it is advised to load the Eagle-cad files into the free version of Eagle-cad and have a closer look at the "board" presentation of the design..
Underneath the Wemos module other components are placed. The DC-DC converter lies over other components. The DC-DC converter is soldered onto a four pole male pin-header and than soldered onto its place on the PCB.
In general GND is at the left side of VCC+/5V+.
On the three pole sensor connectors from left to right the pins are GND, 5V, Signal. On the output pins of the LED switch decoder left is GND and right is 5V.
The bills of material of the decoders are on a separate user page.
The placement of the components can be found in the black and white pictures below.
![]() | On the turnout decoder the position for the two fuses is depicted with the vertically placed resistor. |