I was planning on using my airplane transmitter and receiver with brushed ESC's for making a simple off-road RC Rover. I was calibrating my tx signals when my receiver was fried :-(.
Then i made a few rf encoder and decoder modules with a some free copper clad board & my trusty ht12e,ht12d
encoder and decoder IC's. The rover can move effortlessly over vegetation of around 15-20cms tall.
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Step 1: Go Get the Stuff
Heres whats needed
1x ht12e IC
1x ht12d IC
2x empty plastic boxes
1x chassis (any 25-40 cm chassis will do)
1x 3s Li-po or 3s Li-ion battery (i made my own using 3 mobile batteries and putting them in series)*
2x 10cm x 4cm wheels
2x 7cm x 2cm wheels
assortment of resistors
double sided tape(not in pic)
2x SPDT switch (not in pic)
2x geared motors (100 rpm)
1x motor driver (L293d)
1x 9v battery and clip
2x dummy motor
1 cardboard box **
1 balance charger (not in pic)***
*any 12v battery will do
** purely optional only for cosmetic purposes
*** for charging batteries.
Step 2: Mount Those Motors
Mount the motors at the back and dummy motors at the front
as easy as it sounds.
Step 3: Put on the Wheels
screw on the big wheels to the back motors and the small ones at the dummy motors
you should have something looking like the final pic.
Step 4: The Transmitter
This is an essential part of the build.
make two holes for the switches.
Mount the encoder.
Connect the 2 spdt switches as shown.
Solder female wires to the rest of the pins.
the connections are put as notes in the picture of the switch.
Mount the switches.
Connect the power to the positive of the 9v battery clip and negative to negative.
Thread the 9v battery plug out of the box from a hole in the centre.
finally attach the 9v battery in the centre using tape.
use a 17cm long antenna for the longest range.
ALWAYS SOLDER IN A VENTILATED AREA AND KEEP AWAY FROM THOSE NASTY FUMES.
you should have something like the transmitter i made.
Step 5: The Rover and Receiver
Attach the motor driver using good old double sided tape and attach the wires using the screw tabs.
Then attach M1 input 1 to d0.
Then attach M2 input 2 to d1.
if it does not work attach the wires to d2 and d3 respectively.
if it still does not work check your decoder.
i will give a link at the end that outlines the working of the encoder and decoder.
Remember that the natural state of the decoder pins is high.
connect the enable pin of the motor driver to the VT pin of the Decoder.
We are using only one pin because i didnt want a reverse function, i tried it but it only complicated things
Step 6: Give It Some Attitiude
so now that we have finished our rover's electronics, we can continue with the cosmetic part.
Take a cardboard box and cover it with some brown paper.
Then cut out a long section around 10 cm long and make a tube.
coat the tube also.
make a rectangular cut for inserting the tube
then fully cover the box with the paper.
secure the box over the electronics and allow only the power wires to poke out.
Insert the tube and then paint it.
I went with the color scheme of a tank and made it brown with green blotches.
Step 7: Let It Free
Sorry for the bad resolution.
Fpv Vid coming later.
connect the power and get ready for some off-road carnage. (maybe not carnage).
DRIVE RESPONSIBLY AND DON'T DRINK AND DRIVE :-)
This is just a platform and has endless possibilities.
Here are some
1. PUT A FIREBALL SHOOTER
2. Upgrade to 1000rpm motors
4. Make it 4 wheel drive
5. Put a solar panel and make it self chargeable.
6. Use the arduino to automate it and upgrade the radio system to a 100MW system.
7. LAUNCH MULTIROTORS OFF IT!!!!!!!
8. Put HUGE wheels and tracks
10. And many more