ELRS-TX-setup-motor-dual-dat

MIXES setup

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Issue Analysis: Burned Board Diagnosis == mosfet driver board

Fix 1: Switch from "Add" to "Multiply" (The Safest Software Fix)

The safest way to handle tank steering on IN1/IN2 setups is to use Multiplex ➔ Multiply (*) instead of Add for your steering lines.

When you use Multiply, steering doesn't try to force the opposite pin high or fight the throttle physics. Instead, it acts like a brake—it smoothly reduces power to one side to make a turn.

Change your Line 2 mixing values to this:

CH1 (Left Fwd): Line 2 ➔ Source = Ail, Weight = -100%, Multiplex = Multiply
CH3 (Right Fwd): Line 2 ➔ Source = Ail, Weight = 100%, Multiplex = Multiply

(Do the same for the reverse channels CH2 and CH4, matching the steering polarities).

Why this fixes it: If you are moving forward, IN1 is active and IN2 is completely dead at $0\text{V}$. When you steer, Multiply simply reduces the voltage on IN1 toward $0\text{V}$ to slow that track down. It never commands IN2 to turn on while moving forward, eliminating shoot-through short circuits entirely!

setup guide

Dual Motor Differential Steering (Tank Mix) Setup

This configuration maps your Throttle stick (Left Stick Vertical) to control forward/backward speed, and your Aileron stick (Right Stick Horizontal) to control left/right differential steering.

Because we are combining two distinct inputs (Speed + Steering), each channel will contain TWO lines of code on your RadioMaster Pocket's MIXES page.

🛠️ Transmitter Mixer Layout (CH1 to CH4)

1. MOTOR A (Left Motor) ── Physical Outputs 1 & 2

The left motor spins faster when you steer right, and slower when you steer left.

  • CH1 (Left Motor Forward):
    • Line 1: Source = Thr, Weight = 200%, Offset = -100%, Curve = Func x>0, Trim = OFF
    • Line 2: Source = Ail, Weight = 50%, Multiplex = Add, Trim = OFF
  • CH2 (Left Motor Backward):
    • Line 1: Source = Thr, Weight = -200%, Offset = -100%, Curve = Func x<0, Trim = OFF
    • Line 2: Source = Ail, Weight = -50%, Multiplex = Add, Trim = OFF

2. MOTOR B (Right Motor) ── Physical Outputs 3 & 4

The right motor spins slower when you steer right, and faster when you steer left.

  • CH3 (Right Motor Forward):
    • Line 1: Source = Thr, Weight = 200%, Offset = -100%, Curve = Func x>0, Trim = OFF
    • Line 2: Source = Ail, Weight = -50%, Multiplex = Add, Trim = OFF
  • CH4 (Right Motor Backward):
    • Line 1: Source = Thr, Weight = -200%, Offset = -100%, Curve = Func x<0, Trim = OFF
    • Line 2: Source = Ail, Weight = 50%, Multiplex = Add, Trim = OFF

💡 How to Add the Second Line on EdgeTX

  1. Go to the MIXES page on your RadioMaster Pocket.
  2. Highlight the target channel (e.g., CH1), press and hold the system roller, then select Insert After.
  3. A secondary line will appear nested directly underneath that channel.
  4. Edit this new line to set your steering parameters (Source = Ail, etc.). Ensure the Multiplex option at the bottom remains set to Add.

🔍 Multimeter Verification Protocol (Before Connecting Driver Board)

Disconnect your IN1/IN2 motor driver board and measure the bare receiver signal pins against GND:

  1. Sticks Completely Centered: Outputs 1, 2, 3, and 4 must all read 0V (Dead Stop).
  2. Push Throttle Straight UP: Output 1 (Left Fwd) and Output 3 (Right Fwd) must smoothly climb to 3.3V. Outputs 2 and 4 must stay at 0V.
  3. Throttle Straight UP + Move Steering RIGHT: Output 1 stays high near 3.3V, while Output 3 drops significantly toward 1.6V or lower. This drops power to the right motor, causing the vehicle to pivot right.

final result and initiate screen

ELRS-RX setup

ref

Table of Contents

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