Gear Tooth Sensor

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Hello
I need help programming the gear tooth sensors. I searched chiefdelphi but didnt find any thing that helped me. im looking for the program for the sensors. I came upon some posts but i couldnt get any thing for the sensors.

Also on the sensors there is j1 and j2 you have to wire them both. like one pwm cable for j1 and one for j2. from reading the manual i think the pwm cables go to rc_dig , right?

Thank you

[Phalanx]

First off, download and read Kevin Watsons encoder code and encoder FAQ
http://www.kevin.org/frc/encoder/
http://www.kevin.org/frc/frc_encoder.zip

To make his code work with the gear tooth sensors you need to remove the "Phase B" logic from it.

Second you wire them to digital I/O 1 and digital I/O 2 with a pwm cable. You also need to power them on a 12volt power supply as well.

See the 2007 Sensor Manual for more information.

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"Phase B" dont understand this?
"12volt power supply" for teh this do you mean like connecting a wire for the battery to the sensors. thx

[JSonntag]

1. "Phase B" refers to the code that determines which way the encoder is spinning. Since you are using a tooth sensor and not an encoder, this code will just cause problems.

2. to power on a 12volt supply, run a wire from one of your breaker panels.

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12 Volt Power with using a victor or just straight from there. What kind of a fuse should we use 40 AMP?

Also PHASE B logic, its located inside encoder.c file however I do not know which part to uncomment directly.

You guys have been a tremendous help so far.

[JSonntag]

Go directly from the fuse panel, not from a victor. I am not quite sure but i think you should use a 20 or maybe 30 amp fuse. the 40 amp fuses are for the motors.

The phase b pins are used in if statements so that it adds to the counter if it is moving forward and subtracts when moving backward. You basically have to replace it with code that will just add to the counter whenever an interrupt is fired off.

Something like this should work:

void Encoder_3_Int_Handler(unsigned char state)
{
if(state == 1)
{
Encoder_3_Count += ENCODER_3_TICK_DELTA;
}
}

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for the 12 volts on the board it says 12 and underneath it there is the letter w meanning the white cable goes there from the pwm cable. so we have to connect that whit cable to the fues to get 12volts.

Also the Encoder Handler's are differnet from 1 and 2. like everything above 2 are differnet. is tehre something special about them? thx for all the help.

[JSonntag]

The descriptions for the different encoder handlers are in the encoder_readme.txt file included with the code.

I am not sure exactly how to wire up the sensor since i have not yet wired it up myself and have not yet done the research on how to do so.

[Phalanx]

To wire the sensor...

Take one end of a pwm cable, and solder it to J2, the black wire to GB (ground-black) the red wire to 5R (+5 volts-red) the white wire to SW (signal white). Connect the other end of this pwm to digital I/O 1.

Take a 2nd pwm cable and solder it to J1, the black wire to GB, the white wired to (12W), the red wire is unused. Connect the other end to a 20amp circut on one of your atc breaker panels.

Mount the sensor from .5 to 2.75 mm away from the gear to be measured.

Repeat this for the second one except connect it to digital I/O 2.

As for the code...
Use encoder 1 and encoder 2, disable the others. Then remove the "Phase B" logic in the interrupt handler for encoder 1 and encoder 2.

If you need more help PM me and I will try to clarify it better

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Thx alot. il try to wire the senor.

[Ultima]

Our code looks something like this for Encoder 1 and 2

void Encoder_1_Int_Handler(void)
{
// Encoder 1's phase a signal just transitioned from zero to one, causing
// this interrupt service routine to be called. We know that the encoder
// just rotated one count or "tick" so now check the logical state of the
// phase b signal to determine which way the the encoder shaft rotated.
if(ENCODER_1_PHASE_B_PIN == 0)
{
Encoder_1_Count += ENCODER_1_TICK_DELTA;
}
}

#endif

#ifdef ENABLE_ENCODER_2

Would this work or not?

P.S. If I take away the #ifdef ENABLE_ENCODER_3 from the correct intrrupt would that correctly disable ENCODERS 3 -6. If not was would be the correct way for doing this.