| A4WD1/Tri-Track Spektrum R/C Stick Radio Control Tutorial
Updated 04/20/2011
Safety first! Wear eye protection and never touch a powered robot!
Note: Do not use Loctite or thread locks on the assembly. They are not necessary and may cause damage to the
Lexan. |
![]() http://www.lynxmotion.com/images/assembly/a4wd1rc2/assm00.jpg" border="2" hspace="10" width="320" height="240" />
Tri-Track and A4WD1 Rover with DX5 |
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Step 1.
The Sabertooth 2X10 RC has a feature called battery elimination circuit (BEC) that provides power to the RC receiver. It can provide enough
current to power the receiver alone, but not if servos are used. In order to provide enough power for the receiver and the servos attached to
it, we need to add a separate battery pack. In addition, we need to bypass the Sabertooth's BEC to prevent it from interfering with the battery pack.
Use an exacto knife to carefully pry the black tab up and slip the red wire out of the black housing as
shown in Figure 1.
Bend the red wires up and use electrical tape to cover them as shown. This will prevent accidental shorts. |
![]() http://www.lynxmotion.com/images/jpg/stbec.jpg" border="2" hspace="10" width="320" height="240" />
Figure 1. |
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Step 2.
Plug the Sabertooth into the receiver as shown. Make sure the yellow wires are toward the middle of the
receiver. On some versions, there are two connections marked "AILE". Use the slot between THRO and ELEV for CH 1.
| Sabertooth |
Receiver |
| Ch 1 (Throttle) |
AILE |
| Ch 2 (Steering) |
ELEV |
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Table 2. |
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![]() http://www.lynxmotion.com/images/assembly/a4wd1rc2/assm03.jpg" border="2" hspace="10" width="320" height="240" />
Figure 2. |
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Step 3.
Solder the BATC-01 cable to the WH-04 and cover the bare wires with heat shrink or electrical tape. This will allow you to
use our rechargeable 6.0vdc batteries for the receiver and servos. Attach the switch to any of the holes in the top panel of the chassis. Plug the battery's wiring harness from the radio into the receiver as shown. Make sure the black wire is on the outside of the receiver. This is shown in the schematic below.
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![]() http://www.lynxmotion.com/images/assembly/a4wd1rc2/rovsch03.png" border="2" hspace="10" width="320" height="240" />
Figure 3. |
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Schematic.
![]() http://www.lynxmotion.com/images/assembly/a4wd1rc2/rovsch01.png" border="0" width="640" height="773" />
Schematic. |
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Step 4.
Bind the transmitter to the receiver. Refer to the Spektrum manual for detailed instructions. |
![]() http://www.lynxmotion.com/images/assembly/a4wd1rc2/assm01.jpg" alt="" width="320" height="240" hspace="10" border="2" />
Figure 4. |
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Step 5.
Make sure your Sabertooth's dip switches are in the default positions, as shown in Figure 5. It would be a good idea to read the
Sabertooth
manual to familiarize yourself with the different settings. With the default settings, you can now control the rover although the controls will be reversed. This will be corrected later. |
![]() http://www.lynxmotion.com/images/jpg/sbrtooth.jpg" border="2" hspace="10" width="320" height="211" />
Figure 5. |
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Step 6. (Optional Pan and Tilt)
If you are not installing a Pan and Tilt you can skip down to step 8, ignoring this step. Punch the cutout out of the top panel. |
![]() http://www.lynxmotion.com/images/assembly/a4wd1rc2/assm05.jpg" alt="" width="320" height="240" hspace="10" border="2" />
Figure 6. |
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Step 7. (Optional Pan and Tilt)
Create a pan and tilt. Detailed instructions can be found http://www.lynxmotion.com/images/html/build153.htm">here. Insert the bottom servo into the top panel and secure with 3mm hardware.
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![]() http://www.lynxmotion.com/images/assembly/a4wd1rc2/assm09.jpg" alt="" width="320" height="240" hspace="10" border="2" />
Figure 7. |
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Step 8.
To set the controls to behave normally, you must adjust the servo option switches. They are located on the front of the remote. Set them as listed in Table 8. |
| Channels |
Function |
NOR/REV |
| THR |
Tilt Servo |
Normal |
| AIL |
Pan Servo |
Normal |
| ELE |
Steering |
Reversed |
| RUD |
Throttle |
Reversed |
| MIX |
Right stick mixing |
Normal |
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Table 8. |
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Step 9.
Refer to Figure 9 for information on controlling the robot.
![]() http://www.lynxmotion.com/images/jpg/rccont.jpg" border="0" hspace="10" width="800" height="379" />
Figure 9.
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