I have to reconsider my IAS indicator, one problem was a dial scale but this one has been resolved with a new design.
Now my problem is the speed of a stepper motor very low for this kind of application and the step movement of the needle disturb me ,in fact is not enough real.
To summarize:
1. the dial scale is a little far from the reality
2. the steeper speed too low
3. the needle's step movement
For the first point I have to redesign the dial scale.
The second and third point, I make a choice to try with a servo. The fact is I need a servo turning at the minimum from 0° to 320°.
I opted for a modified continue rotation Futaba S148 .
Overview
The Parallax (Futaba S148) continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. It can be controlled directly by a microcontroller without any additional electronics, which makes it a great actuator for robotics projects. The servo includes an adjustable potentiometer that can be used to center the servo and comes with a star-shaped servo horn and an 11″ (270 mm) lead.
Specs:
• Power: 4.8 – 6 V
• Top 6 V speed: 50 RPM (with no load)
• Torque: 2.7 kg-cm/38 oz-in at 6 V
• Weight: 43 g/1.5 oz with servo horn and screw
• Size (L x W x H): 40.5 mm x 20.0 mm x 38.0 mm / 1.60" x 0.8" x 1.50"
• Control interface: RC servo pulse width control, 1.50 ms neutral
• Manual adjustment port
• Speed at 6V: 0.22sec/60°
• Speed at 4.8V: 0.28sec/60°
I put in bold and underlined the interesting parameters for my application.
Despite the fact that the servo is modified, the standard library for coding in Arduino still usable.
Now my problem is the speed of a stepper motor very low for this kind of application and the step movement of the needle disturb me ,in fact is not enough real.
To summarize:
1. the dial scale is a little far from the reality
2. the steeper speed too low
3. the needle's step movement
For the first point I have to redesign the dial scale.
The second and third point, I make a choice to try with a servo. The fact is I need a servo turning at the minimum from 0° to 320°.
I opted for a modified continue rotation Futaba S148 .
Overview
The Parallax (Futaba S148) continuous rotation servo converts standard RC servo position pulses into continuous rotation speed. It can be controlled directly by a microcontroller without any additional electronics, which makes it a great actuator for robotics projects. The servo includes an adjustable potentiometer that can be used to center the servo and comes with a star-shaped servo horn and an 11″ (270 mm) lead.
Specs:
• Power: 4.8 – 6 V
• Top 6 V speed: 50 RPM (with no load)
• Torque: 2.7 kg-cm/38 oz-in at 6 V
• Weight: 43 g/1.5 oz with servo horn and screw
• Size (L x W x H): 40.5 mm x 20.0 mm x 38.0 mm / 1.60" x 0.8" x 1.50"
• Control interface: RC servo pulse width control, 1.50 ms neutral
• Manual adjustment port
• Speed at 6V: 0.22sec/60°
• Speed at 4.8V: 0.28sec/60°
I put in bold and underlined the interesting parameters for my application.
Despite the fact that the servo is modified, the standard library for coding in Arduino still usable.
Soon the test with this servo.
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