Dextrus 2.0
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# Dextrus v2.0
The Dextrus v2.0 has a number of changes from the Dextrus v1 hands which appeared in the OHP indiegogo videos. It now uses flexible joints and linear actuators which have several key changes to the way it functions. The Dextrus v2.0 has…
- Flexible joints, which make the fingers mechanically compliant when being forced closed.
- A much smaller circuit board, which reduces the volume of the hand significantly.
- Linear actuators, which are more powerful and much lighter than the previous DC motors.
- 5 Actuators instead of 6; a cost, size and weight saving measure that has a minor effect on functionality (the thumb no longer has independent opposition).
- 3.5mm headphone jack to connect the EMG daughter electronics.
- A rubberized body, which makes the hand much more robust to dropping and grasping things.
- A unibody design, which makes the hand much smaller, lighter and easier to assemble, but makes replacing individual fingers impossible if broken (although the entire hand only costs around £20 to print, so can be replaced with relative ease).
When using the Dextrus v2.0 you should **always leave the hand in the open position when not in use**, with all fingers and the thumb completely extended. This will help to prevent joint fatigue. If you find you’ve accidentally left fingers in the closed position for a long period of time simply open them completely and leave them open for several hours and they should return to their original position. This device is still a prototype so be careful with it and please get in touch if anything breaks. We’re continuing our development and working very hard on improving all aspects of the design.
### Dextrus v2.0 Device Specification
- **Operating Voltage Range**: 9V-14V
- **Recommended Voltage**: 12V
- **Max Current Draw**: 1.2A @ 12V
- **Idle Current Draw**: 40mA @ 12V
- **Power Connector**: Standard DC Jack
- **Control Interface**: USB serial
- **Peripheral Connectors**: 2 Analog channels on 3-pin 3.5mm Headphone Jack
- **Mechanical Connectors**: M3 Bolts
- **License**: [Creative Commons Attribution-ShareAlike 4.0 International License] (http://creativecommons.org/licenses/by-sa/4.0/).
### Open Hand Project
[www.openhandproject.org] (http://www.openhandproject.org)
[www.openbionics.com] (http://www.openbionics.com)
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Component (19)
Qty
Description
R-EU_
R13, R46, R15, R45, R1, R11, R10, R30, R9
9
resistor:R-EU_:R0603
ATMEGA*
IC1
1
atmel-2005:ATMEGA*:AU
C-EU
C4, C36, C11, C33, C3, C34, C12, C8, C15, C9, C2, C17, C38, C35, C1, C10, C37, C22, C24, C7, C16, C20
22
resistor:C-EU:C0603
SFW5R-1STE1LF
M1, M4, M3, M5, M6, M2
6
Firgelli SFW5R-1STE1LF:SFW5R-1STE1LF:
