Download PWM signal

Throttle System High Level Overview
Tachometer Voltage
Voltage: 0 – 5V
Frequency: “0” – 208Hz
- Speed linearly related to
frequency as shown in plot
below
DAC Throttle Signal:
Voltage: 0.55 – 2.75V
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Throttle Arduino
Analog Throttle
Signal:
Voltage: 0 – 3.3V
PWM signal:
Voltage: 0 – 3.3V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
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Digital Level Shifting
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PWM signal:
Voltage: 0 – 5V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
RC Receiver
Level Shifting Circuit:
Components: Amplifier and two resistors
Shifts Input Voltage: 0.55 – 2.75V
To Output Voltage: 0 – 3.3V
- 5kΩ resistor used to imitate the 5kΩ throttle pedal variable
resistor for correct current draw from stock golf cart
controller. Prevents stock controller from thinking it has lost
connection with throttle pedal.
- Single relay selects signal going to golf-cart controller; pedal
signal or generated signal. Relay is controlled by the main
board; 3.3 V from the main board switches the generated
signal to the golf cart controller .
Stock Golf Cart Motor
Controller
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Motor
Power to Motor
Voltage: Unknown
Braking System High Level Overview
Brake Controller PWM Signal:
Voltage: 0 – 5 V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
Brake Controller PWM Signal:
Voltage: 0 – 3.3 V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
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Throttle Arduino
PWM signal:
Voltage: 0 – 3.3V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
1
Digital Level Shifting
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Potentiometer Voltage
Voltage: 0 – 3.3V
- Actuator position linearly
related to voltage.
- Full retraction: 13 mV
- Full extension: 383 mV
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Actuator
Digital Level Shifting
Current to
Actuator
Voltage: 12 V
Current: ±10 A
Brake Actuator Controller:
Converts Input PWM: 1ms – 2ms Positive Pulse Width
To Output Current: -10 A – 10 A @ 12 V
Actuator Stop Condition: 1.5 ms Positive Pulse Width
- Controller settings need to be as shown in the image below.
- Information on the motor controller can be found here.
PWM signal:
Voltage: 0 – 5V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
RC Receiver
http://www.lynxmotion.com/p-563-sabertooth-2x12-rc-regenerative-dual-channel-motor-controller.aspx
Steering System High Level Overview
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Potentiometer Voltage
Voltage: 0 – 3.3V
- Steering angle linearly related
to voltage.
- Full Left: 1.412 V
- Full Right: 3.2 V
DAC Differential Steering
Signals:
Voltage: 0.55 – 2.75V
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Steering Arduino
PWM signal:
Voltage: 0 – 3.3V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
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Digital Level Shifting
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Analog Steering
Differential Signal:
Voltage: 0 – 5V
Steering Reference
Voltage for Level shifting:
Voltage: 1 V
PWM signal:
Voltage: 0 – 5V
Period = 22ms
Positive Pulse Width: 1ms – 2ms
RC Receiver
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Main Arduino
Level Shifting Circuit:
Components: Amplifier and two resistors
Shifts Input Voltage: 0.55 – 2.75V
To Output Voltage: 0 – 5V
- Single relay selects signal going to power steering controller;
torque sensor or generated signals. Relay is controlled by the
main board; 3.3 V from the main board switches the
generated signal to the power steering controller .
Power Steering
Controller / Wicked
Module