The SR04 works by sending a trigger signal and waiting for the echo signal. It then calculates the time between the two signals and translates this to distance. All this happens in the pulseIn() function used with this sensor.

In order to make it work with Firmata you must send a signal out the trigger pin and as soon as you receive a signal from the echo pin you must do the math to make the conversion, meaning, you must translate the workings of pulseIn() to a Pd patch. Connecting a pin of the sensor to an analog pin simply doesn't make sense.

You can instead use the code that is provided (don't know where, but there are some examples for this sensor, right?), and on the Pd side use [serial_print], an abstraction that works with Arduino's Serial.print() function. You can get it here https://github.com/alexdrymonitis/Arduino_Pd

Make sure you read both the help patch and the Arduino sketch in order to make the appropriate changes to your code.

is there a work around for this?

the sr-04 is a way cooler sensor than the ones supported by

standardfirmata!

why is it not supported?

there most be a hack to make the emiter and receiver

functions act as one with the signal going into the analog

inputs of the arduino. as a standard sensor?

wow, i google and there is almost nothing out there about this

i'm a bit tired of trying to do this

please help

thanks

r.y

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