Modern Device Forum

Roy,

Yes - maybe email support at moderndevice.com and I'll answer some of the technical questions about where we're at with testing and new regressions. As you mention the listed code is old.

Paul Badger

Roy,

The bridge is R3/R4 R5/R6
As the sensor heats up the bridge is balanced.

Paul

and how did you arrive at the equation Vraw = V0 + b * WindSpeed ^ c. I know in your blog you derived this from an formula done by university of E2 – A2 = B U0.5. can i have the name or reference to the university white paper that you read about. Caimbridge University in UK has lots of great inform...

rynait r5 & r6 are setting a reference voltage to be compared the active arm of the circuit. When the voltage changes the heated sensor changes resistance, balancing the circuit. So voltage is proportional to the square of wind speed, approximately. R5 representing a small value in proportion to oth...

rynait, I don't have any special knowledge about this. But some facts about the sensor that may or may not be useful.  • The sensor is pretty easy to spit the sensing head off from the electronics just cut it with tin snips between the headers and then join back together with three wires. Distances ...

abian_B

Glad you got it working. About +- 1.5 degree variation max, is what I see in the shop too, when testing the sensors.

pb

quarterturn, The easiest way to do this is with a serial port that is not attached to the USB such as Serial1 on a Mega. Here's a brief sketch of what I think is the easiest way. • Make sure the Fluxamasynth solder jumper is set to the left hand pad to the middle - right hand pad is bare (not connec...

The temp sensor is MCP9701A. Its output is not scaled at all. Tambient = ( Vout*(5/1024) – 0.400 ) / 0.0195 should be correct if Vout is the read from the analog pin ADC on a 5 volt arduino. Recheck pin connections? Test your arduino ADC with a simple voltage divider to see if reads ~512 I'm baffled...

bschulz1701, I don't think we're going to update that schematic. We have been rethinking whether we even want the wind sensors to be open source at all, since they're unique products and we have spent a lot of time figuring out the circuits and getting them calibrated in their current state. We cont...

Jeff Avery,

Thank you for your code snippet. I'm glad you got it working.

Paul Badger

nicotep, I'm glad you got it going, but it is always a bit unsatisfying when things start working without a purposeful change. Did you change power sources? It's always worthwhile powering audio projects on batteries and linear regulators as an experiment to rule out power supply noise if it might b...

Codeman,

Apologies for my slow response to the forum.
Was your board ordered with the MIDI options? When set to the midi jack we set the jumpers to the middle and right jumper (with the MIDI jack on the right).

I'll update this with the picture of the jumpers when set to midi jack input.

admiralmaggie, I apologize for the long delay on getting to the forum. Yes that code for Rev C is suboptimal and has some of ADC resolution rolled into the math. We just revised the Rev C and are going to revise it a couple of more times in in the two months or so to put in some temperature compensa...

dfdtitmouse, Apologies for the long delay getting to the forum. It seems like you made work in the intended way with a few boards. The 32U4 shouldn't be that different except for the USB connection - which resets on every upload. Are you just trying to pass midi/serial through and have that work? Or...

Hmm, This is the first I've heard of excess hiss. The little I've played with the board it sounded very clean. About the best I could do would be to send you a new board to compare, but we would need to solder headers on so I could get the board back if it performs the same way. Let me do a little r...

Alluminator,

Yes negative values for zero wind are fine.

As far as the temperature goes, it will only be accurate with a 5 volt regulated supply.
I hope we can revise that code soon also because it seems like it may be a problem as well.

Paul Badger

The SDA and SCL pins are a bit of problem. Shawn Wallace (the designer of the current version of the board) informed me that he had used an out of date doc on the ESP WROOM which had either SDA or SCL mislabelled. So this one will require adding a wire from the ESP module. Of course (to push our own...

Sorry I didn't think to suggest this - you have 64 channel polyphony without effects and at least 16 channel polyphony with all the effects on reverb, EQ etc, so by all means - add the drone.

The SPI pins are entirely free on that board. The only connection between the dream chip and the uC is on pin 4 for sending serial info (at midi speeds) and pin 5 for receiving serial from the midi jack (if present).

Paul

Is the goal here (15V operation) to be able to capture much higher wind speeds with more accuracy? If so then tweaking the regulator resistors would provide some of those benefits while still powering at 12 volts. Currently the regulator is set just above 9 volts. To change the heat differential on ...