DIY Radio Controlled Lawnmower

SIMPLE INTERFACE

 

A TRUE DO-IT-YOURSELF Radio Controlled Lawn Mower!

all material here is copyright Terry Creer 2007

 

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DISCLAIMER - THE METHODS OF CONTROLLING AN UNMANNED VEHICLE DETAILED BELOW ARE POTENTIALLY LETHAL. YOU CAN KILL SOMEONE, AN ANIMAL OR A ROSE GARDEN IF YOU ARE NOT CAREFUL. I ACCEPT NO RESPONSIBILITY FOR LOSS OF LIFE, BEER PRIVILEGES OR SEX FOR CONSEQUENCES THAT ARE BEYOND MY CONTROL. IF YOU DECIDE TO BUILD A MOWER LIKE MINE YOU DO SO AT YOUR OWN RISK. BY BUILDING THE PROJECTS STATED BELOW YOU ARE ACKNOWLEDGING THAT IT IS ONLY YOUR FAULT IF SOMETHING GOES WRONG.

 

OPTION 1 - The Simple Approach

Bits required:

1.      2 channel hobby RC transmitter and receiver

2.      2 x standard hobby servos (usually included in the transmitter/receiver deal)

3.      1 battery pack to power receiver and servos  (usually included in the transmitter/receiver deal)

4.      1 (or optionally 2) servo fail-safe units in case of emergency. NOTE - these are not necessary, however at least one on the forward/reverse servo is HIGHLY   RECOMMENDED in case the mower decides to run away, chewing up the neighbours dog in the process.

5.      2 x 10k-ohm potentiometers (Jaycar Part number RP-3510)

6.      4 x 10k-ohm 1% 1/4W resistors (Jaycar Part number RR-0596)

7.      4 x 15k-ohm 1% 1/4W resistors (Jaycar Part number RR-0600)

8.      Cable to connect Interface to Wheelchair controller (see details below)

9.      Small Piece of 'veroboard' to mount the resistors and wire onto (optional). See Jaycar Part number HP-9550.

Alternatively, you can have a nice neat setup with my custom PCB: 

Get the Schematic, PCB and Assembly details HERE

Constuction:

1. As per an RC car, the battery pack plugs into the power socket of the receiver

2. Failsafe plugs into the forward/reverse channel (check your transmitter if not sure). From there, the other end of the fail-safe plugs into the forward/reverse servo.

3. If using 2 fail-safes, follow step 2 to install the left/right fail-safe and servo. If no fail-safe is used, just plug the servo straight into the receiver.

See the pic below for setup overview.

Click the pic for a larger view

Mount your assembly inside a sealed box and attach it to the controller. I'm sorry I can't show you any pics of this setup because I never built one. I went straight for the Advanced Interface...

With a voltmeter, determine the +12V and common pins on the wheelchairs joystick connector. You may need someone who's cluey with electronics to figure where to look. Then connect this setup straight to the controller and you're done!