Search found 634 matches

by paul
Fri Dec 02, 2016 7:01 pm
Forum: Sensors
Topic: Issues with Pulse Sensor & Teensy
Replies: 7
Views: 4233

Re: Issues with Pulse Sensor & Teensy

wintrmute, This issue you ran into is that the I2C code in my library was bit-banged for the Arduino. It's probably not too much of an issue to swap the Teensy pins you want to use in the code. You'll need to feel comfortable with modding libraries though. You can look for the library that a custome...
by paul
Fri Dec 02, 2016 6:56 pm
Forum: Sensors
Topic: How to power up Pulse Sensor using external battery?
Replies: 2
Views: 2530

Re: How to power up Pulse Sensor using external battery?

nternetizen,

The problem is the power up issue with the I2C lines. Push the reset line on your microcontroller and you should see the sensor power right up.

PB
by paul
Fri Dec 02, 2016 6:54 pm
Forum: Sensors
Topic: Wind Sensor Rev P updated code?
Replies: 1
Views: 2140

Re: Wind Sensor Rev P updated code?

perb,

Sorry for extended reply.
the ambient isn't going to vary that much with this sensor. Especially at rocket speeds.

Paul
by paul
Fri Dec 02, 2016 6:52 pm
Forum: Sensors
Topic: current sensors
Replies: 2
Views: 2462

Re: current sensors

avgreg46, Our sensor will work really well for this (it's really easy to sense 50 amps right through a line cord) but you'll need to hook it up to a solid state relay - and also to some kind of DC power source. It would be fairly easy to hook the output up to a solid state relay without a microcontr...
by paul
Fri Dec 02, 2016 6:49 pm
Forum: Sensors
Topic: Pulse/Heartbeat Sensor
Replies: 1
Views: 1724

Re: Pulse/Heartbeat Sensor

sx3374, The PSO2 code still leaves lots to be desired. It is supposed to a "ratio of ratios". Instead the code is just a ratio of IR over Red. The PSO2 signal is not that exciting a signal because with reasonably healthy people it will be 98-100 percent and NEVER VARY. It is possible to de-saturate ...
by paul
Fri Dec 02, 2016 6:44 pm
Forum: Sensors
Topic: Wind Sensor rev C zero wind adjustment
Replies: 2
Views: 2644

Re: Wind Sensor rev C zero wind adjustment

vgatesr

See my other answer.
zeroWindAdjustment can be negative.

pb
by paul
Fri Dec 02, 2016 6:42 pm
Forum: Sensors
Topic: Zero wind adjustment(nan)
Replies: 1
Views: 1988

Re: Zero wind adjustment(nan)

vgatesr

Code:"const float zeroWindAdjustment = 0.2;"
If you can't bring it into calibration by changing the zero wind speed it MAY be damaged BUT
try zeroWindAdjustment with a negative value
Also make sure you have a solid regulated 5 volt supply to the sensor.

pb
by paul
Fri Dec 02, 2016 6:39 pm
Forum: Sensors
Topic: Wind Sensor Rev P - output voltage with no wind
Replies: 2
Views: 2532

Re: Wind Sensor Rev P - output voltage with no wind

rio_schad ,

The Rev P will actually saturate at closer to 7 volts but this will be with wind speeds upwards or 100 mph

PB
by paul
Fri Dec 02, 2016 6:38 pm
Forum: Sensors
Topic: Wind Sensor Rev P - output voltage with no wind
Replies: 2
Views: 2614

Re: Wind Sensor Rev P - output voltage with no wind

rio_schad,

The sensor does not have a zero voltage - zero wind value because the sensor needs to be kept hot. This is the is the standard way that all hot wire anemometers work. The added voltage is proportional to about the square root of the wind speed.
by paul
Fri Dec 02, 2016 6:36 pm
Forum: Sensors
Topic: Wind Sensor Rev. P New Scketch???
Replies: 1
Views: 1822

Re: Wind Sensor Rev. P New Scketch???

Not right now. We hope to have something soon.

PB
by paul
Fri Dec 02, 2016 6:35 pm
Forum: Sensors
Topic: Wind Speed sensor - low speeds
Replies: 4
Views: 6029

Re: Wind Speed sensor - low speeds

Ribber, We tested the sensor in a wind tunnel we built. We had to include baffles to increase the pressure and decrease the speed for the lowest settings. We are not overly confident about our low speed data but it does sysch up with walking speed and tests we've done. It is also very easy to sense ...
by paul
Fri Dec 02, 2016 6:31 pm
Forum: Sensors
Topic: Rev P Wind Sensor equations with ambient temperature comp
Replies: 1
Views: 1832

Re: Rev P Wind Sensor equations with ambient temperature comp

No they are not the same as for the Rev C.
The Rev P contains hardware ambient sensing, so is MUCH less sensitive to ambient temperature changes. I hope to be posting some new regressions sometime in the next few months.

We realize they are long overdue.

pb
by paul
Fri Dec 02, 2016 6:29 pm
Forum: Sensors
Topic: Regarding Capsense Library on Arduino
Replies: 7
Views: 7933

Re: Regarding Capsense Library on Arduino

ranjit, I realize this question is very old, but I am answering for those who might find the information useful. You will find many links to capacitive sensing on the internet, many of them probably a tad confusing. There are several techniques in use and many small variations of them. Basically I b...
by paul
Wed Jul 20, 2016 7:36 pm
Forum: Hardware
Topic: RGB LED pixels dying?
Replies: 2
Views: 2017

Re: RGB LED pixels dying?

I haven't seen that before. You might monitor your power supply under some changing conditions to see if there appear to be spikes on the line. You would probably need an oscilloscope to see them however. You could try padding your 12 volt line with some largish capacitor like 1000u - make sure the ...
by paul
Sat Mar 07, 2015 11:36 am
Forum: Sensors
Topic: Wind Sensor usage and adjustment
Replies: 1
Views: 4780

Re: Wind Sensor usage and adjustment

Martyn, You may have moved on to other things by now but I'll answer this to have it in the forum. -- Is there a straightforward way to adjust the sensor in order to get an accurate, or at least consistent output despite naturally varying air temperatures from one day to another? The sketch is suppo...
by paul
Sat Mar 07, 2015 11:29 am
Forum: Sensors
Topic: Wind Speed sensor - low speeds
Replies: 4
Views: 6029

Re: Wind Speed sensor - low speeds

donalg, "It depends" - which I'm sure is not the answer you want. The sensors are exquisitely sensitive to low wind speeds. However the response varies greatly by the direction of the wind. Also it might be necessary to tweak the zero wind point up a tad, to make sure you don't miss the low end resp...
by paul
Sat Mar 07, 2015 11:23 am
Forum: Sensors
Topic: Wind sensor
Replies: 1
Views: 4055

Re: Wind sensor

Gbelcik, Your best bet is to provide some kind of low dropout regulator. You may need a shunt regulator if you can't find a low-dropout regulator that will work with that low a dropout, at a current of around 50mA. The problem you're seeing is mostly with the temperature reading which is mostly a vo...
by paul
Sat Mar 07, 2015 11:20 am
Forum: JeeNode and Wireless
Topic: Carrier hopping
Replies: 1
Views: 3379

Re: Carrier hopping

Jon, Hmmm, I'm surprised by the frequency hopping and would expect much tighter control also. If you just have one radio I'd like to see you test another before making any determinations. These are very inexpensive radios, mass produced in volume and while we do test them for transmission, and recep...
by paul
Sat Mar 07, 2015 11:14 am
Forum: Sensors
Topic: SHT21 LibHumidity library problem with Arduino 1.6.0
Replies: 1
Views: 4193

Re: SHT21 LibHumidity library problem with Arduino 1.6.0

hardmar,

Thanks for the bug report, we'll rev the library with some if-defs to deal with Ard. 1.6

Paul
by paul
Sat Mar 07, 2015 11:11 am
Forum: Connecting to BBB, RBBB
Topic: Adding LEDs for Rx and Tx feedback
Replies: 2
Views: 3596

Re: Adding LEDs for Rx and Tx feedback

bcharusa,

I'm not sure what context you're talking about. Our BUB boards and all of our boards that I can remember have at least one RX/TX activity LED.
Give me some more details, please

Paul