Scorpion Nano Dual ESC

Specifications

The Scorpion Nano:

• Size: 0.75″ x 0.60″ x .15″
• Weight: 6.0 grams
• Standard R/C pulse format
• 3.3V to 16V battery voltage
• 1.2A continuous (2A peak) current on each channel.
• THe Scorpion Nano is a fully reversible H-bridge design. Equal power handling in both directions on both channels.
• Full current limiting and over temp limiting. Motors and batteries are protected from dead short conditions.
• Two channels may be either mixed (throttle/steering) or separately controlled. Ideal for skid steer vehicles/robots.
• Status LED status information and mode indications
• The Scorpion Nano has a receiver battery eliminator circuit (BEC) that is standard but may be disabled by the user. This can provide up to 100 mA of current at 3.3V to the RC receiver and other attached electronic circuits.
• Failsafe shuts off motors if R/C signal is lost. This is a requirement for most combat robot matches.
• Calibrate function matches the unit to radio signal range. The settings are retained in EEPROM non-volatile storage.
• Mix Jumper can be cut to enable separate control of each channel.
• Comes with pre-soldered RC and battery/motor wires for easy assembly into your robot.

Scorpion Nano Calibration Procedure

No motors are needed for this but they don’t interfere so it can be done in a fully wired robot.

1. Turn on TX and apply power to Nano and receiver with RC wires plugged in
2. Wait for solid LED on Nano which indicates RC signals detected
3. Controls should be centered and trims should be at neutral i.e. default radio factory condition but with the channel reversing set as you like it
4. Press and hold the CAL button until the LED goes out (about 3-5 seconds). Then release CAL button. LED should blink
5. Move the controls to the extremes of travel several times both together and individually
6. Press and release the CAL button to permanently store the settings

To do a factory reset: follow steps 4 and 6 above with TX OFF and/or without the RX plugged in. This sets the Nano to the internally stored default Futaba RC signal range which should be close enough to get started on every radio that outputs standard RC PWM signals.

Mixing Notes

The scorpion comes with a mixing jumper. Different revisions may or may not have it installed; see diagram. If your transmitter has mixing, and the mixing jumper is installed on the scorpion, both mixings will cancel out, leaving an unmixed signal. The symptoms of an unmixed signal are that the bot will not turn, and/or putting the stick into the upper right hand corner makes the bot drive forward, lower left hand corner makes it drive backward. If these are occurring, suspect a mixing problem. Either disable mixing on the scorpion or on the transmitter and see if that corrects the problem

Robot Power recommends disabling mixing on the transmitter and usong the onboard mixing. If that isn’t practical, we can successfully report that we’ve disabled the onboard mixing and run a mixed signal out of the transmitter with no problems for years.

Troubleshooting notes from Robot Power

• If the Status LED goes solid that means the RC signals are being received and are in the proper range (and the CPU is working)
• If the motors both respond to the throttle and go forward and reverse properly that means the CPU, power circuits and voltage regulator are working
• If the motors won’t respond to differential it means something is messed up with the mixing function
• Transmitter mixing is on and on-board mixing is on – cancels out
• Steering channel goes out of range or is calibrated wrong  this causes an RC error shutdown
• When calibrating both sticks must be moved to their full extent several times.  Sticks should be centered and trims centered when entering calibration mode.  The initial stick position sets the neutral point.

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