How to wire the IR on the RC?

[marccenter]

I think you will need to power the IR board via the 12V distribution panel. I believe the PWM outputs are 5V. The IR board needs at least 7 Volts in order to work properly, hence wiring to the 12V panel. I would recommend a very small fuse, like 1 amp.

[Mark McLeod]

Originally Posted by marccenter

... the PWM outputs are 5V...

The PWM outputs are at unregulated backup battery voltage, nominally 7.2v and dropping

[marccenter]

Originally Posted by marccenter

I think you will need to power the IR board via the 12V distribution panel. I believe the PWM outputs are 5V. The IR board needs at least 7 Volts in order to work properly, hence wiring to the 12V panel. I would recommend a very small fuse, like 1 amp.

Thanks Mark for the PWM output information (tied to backup battery voltage)

[fstumpo]

Not sure what you are seeing on your Vex but here's some code from out testing unit. The check for rc_dig_14 is just a way to run this code only if a jumper is in 14.

My printf is returning all zeros, unless an IR cmd button is pressed.

printf("c1: %d c2: %d c3: %d c4: %d\r", (int)rc_dig_in03,(int)rc_dig_in04,(int)rc_dig_in05 ,(int)rc_dig_in06);

if (rc_dig_in14) //no jumper
{
if (rc_dig_in03)
ir_cmd = CMD0;
else if (rc_dig_in04)
ir_cmd = CMD1;
else if (rc_dig_in05)
ir_cmd = CMD2;
else if (rc_dig_in06)
ir_cmd = CMD3;

switch (ir_cmd)
{
case CMD0: //Forward
pwm02 = (unsigned char) 254;
pwm03 = (unsigned char) 50; //Adjusted for Faster Motor
break;
case CMD1: //Turn Right
pwm02 = 0 + RT_SPEED_ADJ - 20; //Adjusted for slower motor
pwm03 = 0 + RT_SPEED_ADJ;
break;
case CMD2: //Turn Left
pwm02 = 254 - LT_SPEED_ADJ;
pwm03 = 254 - LT_SPEED_ADJ;
break;
case CMD3: //Stop
pwm02 = 127;
pwm03 = 127;
break;
}
}

I have each of the appropriate rainbow cable wires going to the signal pin (white) and I daisy chained the grounds (black) with pins 3 and 4 from the rainbow cable.

I have a toggle sw to control the power to the IR unit, so if the Vex Power in on, then I switch on the IR unit, I get initial 1's then zeroes. If I already have the IR power on, then power on the Vex, I get zeroes from the beginning.

[Bomberofdoom]

Problem solved: IR gone nuts and wiring was wrong.
Next IR will come in next week but we'll be able to work with it by then. Currently we're alterning switches as IRs (seeing how the code reacts with switches on and off etc.)