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Mar 15 17 4:34 PM

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Hi Guys,

I am working on a project where I am making an EMG controlled prosthetic hand. I am using the same actuator (PQ12 -P) and sensor however I am using a completely different microprocessor. I was wondering if anyone would be able to tell me about the actuator connection to the processor in the PCB. The actuator has 5 pins whereas the connections in the board datasheet show only 3 pin connections (page 5, board datasheet). So, I was wondering which pins from the actuators are used in the almond pcb design. I believe it is pins 2, 3 and 4, but im not sure.

Here are the links:
Actuator datasheet: http://www.robotshop.com/media/files/pdf/PQ12-Datasheet-2.pdf
Board Datasheet: https://github.com/Open-Bionics/Almond_PCB/blob/master/Almond%20Board%20Data%20Sheet.pdf

Thanks in advance

--

Sidrah

 
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Mar 15 17 5:05 PM

Hi Sidrah,

The processor on the Almond PCB uses 2 PWM pins to connect to a motor driver, where the output of the motor driver is then connected to the actuator pins (pin 2 & pin 3). The potentiometer wiper pin (pin 5) is connected to the ADC of the processor, to give position feedback.

The remaining 2 pins of the actuator are connected to 5V and Gnd. (Note, if your processor runs at 3.3V you should connect one of the potentiometer reference pins to 3.3V instead of 5V) .

So in summary:

Pin #UseProcessor Pin TypePower/Gnd
1Potentiometer referenceNone5V (or 3.3V)
2Actuator powerPWM (through a motor driver) 
3Actuator powerPWM (through a motor driver) 
4Potentiometer referenceNone Gnd
5Potentiometer wiperADC 


Olly

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