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en:manuals:service-notes-for-eargear-2 [2026/03/18 19:18] – darkgrueen:manuals:service-notes-for-eargear-2 [2026/06/30 19:11] (current) – [Custom Mounting Servos] darkgrue
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 For the purposes of this manual, “left” and “right” references will refer to the EarGear's orientation when worn on the body, relative to the wearer. So, the “right” side is the side of the EarGear with the control board, and on the wearer’s right. For the purposes of this manual, “left” and “right” references will refer to the EarGear's orientation when worn on the body, relative to the wearer. So, the “right” side is the side of the EarGear with the control board, and on the wearer’s right.
 +
  
 ===== Case Screws ===== ===== Case Screws =====
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 {{:en:manuals:right_ear.jpg?400|}} {{:en:manuals:right_ear.jpg?400|}}
 +
  
 ===== Installing Batteries ===== ===== Installing Batteries =====
  
-The EarGear Battery is a single 3.7V 103040 LiPo battery with a "JST PH 2-pin" connector.+The EarGear Battery is a single 3.7V, 1200 mAh, 103040 (approximately 10 x 30 x 40 mm) LiPo battery with a "JST PH 2-pin" connector.
  
 <WRAP round tip 90%> <WRAP round tip 90%>
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 <WRAP round important 90%> <WRAP round important 90%>
 Be aware that, although the JST-PH 2.0 connectors used on the batteries and across industry are polarized, the polarity that any one battery is set up for is EXTREMELY RANDOM. Positive and negative should be correctly indicated by red and black wires, but the position of the wires in the connector may not be correct for the MiTail (or whatever device you plan on using the battery in), because there's actually no real standard. Plugging in the battery with the polarity reversed can, depending on a lot of factors, be quite bad for the device and/or battery. Be aware that, although the JST-PH 2.0 connectors used on the batteries and across industry are polarized, the polarity that any one battery is set up for is EXTREMELY RANDOM. Positive and negative should be correctly indicated by red and black wires, but the position of the wires in the connector may not be correct for the MiTail (or whatever device you plan on using the battery in), because there's actually no real standard. Plugging in the battery with the polarity reversed can, depending on a lot of factors, be quite bad for the device and/or battery.
- 
 </WRAP> </WRAP>
 +
  
 ===== Installing Servos ===== ===== Installing Servos =====
  
-The Ears use two MG90S-equivalent 180 Degrees 1.8KG digital (PWM, **not ** serial) servos. They are 4.5-6.4VDC standard hobby servos.+The Ears use two MG90S-equivalent 180 Degrees 1.8KG digital (PWM, **not** serial) servos. They are 4.5-6.4VDC standard hobby servos.
  
 {{ :en:manuals:mg90s_servo.png?nolink&600 |}} {{ :en:manuals:mg90s_servo.png?nolink&600 |}}
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 {{ :en:manuals:eargear_board.jpg?nolink&600 |}} {{ :en:manuals:eargear_board.jpg?nolink&600 |}}
  
-Avoid connecting the servos to the LED pins on the end of the header block. These pins are reserved.+Avoid connecting the servos to the pins on the left end of the header block. These pins are not connected. 
 + 
 +Make sure you have no slack pinched between the band and the body of the ears, most of the excess cable goes up in the ear case. 
 + 
 + 
 +==== Servo Calibration / Resetting Servo Home Position ==== 
 + 
 +The servos need to be attached in their home position. To do this correctly, first power up the PCB with the new servo attached directly to the board. That will center or "home" the servo before you reattach the servo. The ear "home" position is the ears are parallel with the band. Ear position may be offset if desired, keeping in mind that the "home" position is the middle of the ear's range of motion. 
 + 
 + 
 +==== Custom Mounting Servos ==== 
 + 
 +The servos use a 20T spline (25T is another, **different** spline that is common to encounter in hobby servos). The center screw is M2.5. Make sure your mount keeps the bottom of the ear casing free of obstructions, and that cables are arranged so that they do not resist the turning motion or pinch.
  
  
 == Copyright 2023-2026 © The Mechanical Tail Company Limited contact@thetailcompany.com. All Rights Reserved. == == Copyright 2023-2026 © The Mechanical Tail Company Limited contact@thetailcompany.com. All Rights Reserved. ==