ProtoThrottle Receiver for ESU CabControl, JMRI WiFi Throttle, and Digitrax LNWI



This receiver connects the ProtoThrottle to an ESU CabControl system,  JMRI WiFi Throttle (a.k.a. WiThrottle or Engine Driver), or Digitrax LNWI.  It receives the wireless signal(s) from multiple ProtoThrottles and communicates them directly to the command station over a WiFi network.


5"(L) x 2"(W)


The complete design files for the ESU-BRIDGE and CKT-XBEE are available on GitHub.

User Manual

XBee Board Schematic

Bracket STL file on Thingiverse


Rev A609DD | Release Notes (09/25/2018)

Rev A6D94C | Release Notes (07/08/2018)

Rev A96E7C | Release Notes (06/30/2018)

Update Instructions

  • $99.00

  • 2 in stock

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News & Application Notes

Fast Clocks and the ProtoThrottle

Have you noticed the –:– display on the main screen of the ProtoThrottle and were wondering what that was? Or, are you one of the lucky ones, and actually see a time displayed on the second line? Those characters on the display are for displaying a fast time from one of several fast clock sources. The ProtoThrottle simply acts as a repeater display for the time, from whatever source.


What Are All Those Blinky Lights?

You may have noticed all those blinky lights on the ProtoThrottle and its receivers. Yes, Nathan and I are fans of LEDs on the stuff we build. There is a small coolness factor, but more importantly, for products going out into the wild, beyond our loving care (and our ability to see and touch them), these lights convey important information that helps the user – and us – debug problems when they arise. Below is a guide to what all those lights do and what they mean. To use and enjoy the ProtoThrottle, you certainly aren’t expected to know and remember all the information below. But things do sometimes go wrong, and we wanted to provide a reference guide to help in figuring out what happened. This should also help you understand why one of our first questions, when someone contacts us with a problem, usually involves us asking about those pesky little blinking LEDs…



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