Model number: TRA6521
Get live motor temperature and battery voltage while you drive. Ideal for hobbyists who use Traxxas telemetry—works with a TQi radio equipped with the 6511 Traxxas Link wireless module and the free Traxxas Link app.
Product Details
Get live motor temperature and battery voltage while you drive. Ideal for hobbyists who use Traxxas telemetry—works with a TQi radio equipped with the 6511 Traxxas Link wireless module and the free Traxxas Link app.
Needed to Complete (not included):
- Hobby knife
- Glue
- Paint and finishing tools
NOTE: Photo of completed model is for illustrative purposes only. This is a model kit that requires assembly.
More info
The Traxxas Temperature Voltage Sensor is a simple plug-in accessory that gives you real-time motor temperature and battery voltage feedback while you're driving. It connects to the TQi receiver and power tap to send live telemetry to the Traxxas Link app when paired with a TQi radio and the 6511 Traxxas Link wireless module.
Key Features
- Direct plug-in connection to the TQi receiver and power tap for quick installation and reliable readings.
- Provides live motor temperature data so you can spot overheating before it causes damage.
- Reports battery voltage in real time to help you manage runtime and avoid over-discharge.
- Real-time telemetry requires a TQi radio with the 6511 Traxxas Link wireless module and the free Traxxas Link mobile app.
Why Choose This Sensor
If you run hard or track your truck, the Traxxas Temperature Voltage Sensor is a straightforward way to add useful telemetry without complicated wiring. It’s a compact, no-fuss accessory that helps drivers tune performance and protect components by keeping an eye on temperature and voltage as you drive.
About the Brand
Essential for TRX4 Telemetry
I'm using this on my TRX4 G-500 crawler. Tracking temp is super handy for heavy trailing or rock crawling, especially with 3s batteries. Voltage telemetry is a must when running LiPo's because the low-voltage feature on the Traxxas ESC might not be obvious.Installing the temp probe is a breeze - just zip tie the flat part of the black wire directly onto the motor, any motor really, Traxxas or not. The readings are sent fast and seem pretty accurate so far. The wire length is just right for the TRX4 chassis, enough slack to route but not too much to be annoying.For the voltage, you'll need some basic electronics know-how. Traxxas used a JR male plug with a single wire to connect to the positive power source. You can't use the Traxxas battery adapter without modifying the TRX4 ESC battery connector (which I'm not doing on a new rig). A lot of people just solder the red wire to the ESC connector's positive terminal, which is fine. I prefer a plug/unplug option that doesn't need mods or soldering.The xl-5 hv ESC has a full-voltage takeoff that goes straight to the battery (I checked with a multimeter on 3 different batteries), so I used that for telemetry. But it uses a JST male connector, so I made a JST female to JR female connector by soldering two red 20AWG wires to the terminals. I took out the black wire and the original connector terminals. I made it long enough to go under the battery tray without too much slack. Before connecting, I checked the continuity from the red ESC connector to the final plug.Just out of curiosity, I plugged the telemetry unit and checked continuity and found a 9.05 Ohm resistor in the unit. Same resistance was there with nothing plugged into the telemetry cable, which explains how it works in the receiver box. Later model TRX4s (including the G-500) have BEC voltage going to the receiver, so telemetry picks up on it and sends it to the transmitter even if the voltage wire isn't connected to the battery. I wouldn't trust this for accurate battery voltage since it doesn't show the real battery voltage. Once I connected the battery to the telemetry terminal, I saw real-time voltage. Before connecting, there was no voltage drop when I throttled up quickly; after connecting, I could see the expected dip.Getting it to fit in the receiver box was a bit tricky but not hard. I wish there was 2-4mm more of red wire to make it easier.Skip the half-useless Traxxas adapter, buy some connectors and solder your own JR female to JST female adapter. Spending $3 on a temp mount is silly when you can just use a zip tie for like 10 cents.