Revision as of 15:57, 25 October 2016

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Arduino Radar Gun

Introduction

This is a long term project, so this page will be updated as the project continues. The goal here was to take control of an off-the-shelf radar gun. The gun used for the project was a "Bushnell Velocity Speed Gun" and was purchased on Amazon. An Arduino Leonardo is being used due to it having x12 Analog Inputs. Since the Leonardo is based on the ATMEGA32U4, any of the "Arduino Clones" would work, like this one

Phase 1 - Reading the Speed Data

Connections

All x12 Analog Inputs are connected to the Numeric LCD pins on the gun. A0-A5 are the standard hookups to the Arduino, but A6-A10 go to: 4, 6, 8, 9, 10. Note that the ground connection is made where the battery clip wire terminates into the board

The trigger board cable brings up the positive 3V terminal from the battery stack, which is where I connected my 3.3V source wire. You can see that the two pins on the left are bridged together, which made the soldering much easier

Power to the Radar gun is supplied from the 5V USB, stepped down to 3.3V using a Linear Regulator "TC1262-3.3VAB". The Power Cheater was used for this. WARNING!!! The gun will pull over 200mA when you pull the trigger, so make sure the supply can handle that load current.

LCD Segment Mapping

Here's a shot of my notes when I was mapping the segments - I also took note of the misc characters like low battery, mph, kph, and the little doppler icon that pops up when you pull the trigger.

The Code

Download the Test Code