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Re: Weather Station

 by Mee_n_Mac ¦  Thu Mar 05, 2015 3:01 pm ¦  Forum: Projects ¦  Topic: Weather Station ¦  Replies: 3 ¦  Views: 558

Start here and add/delete as desired ?
https://learn.sparkfun.com/tutorials/we ... 1422685831

Re: ADXL345 Digital Inclinometer

 by Mee_n_Mac ¦  Wed Mar 04, 2015 10:56 pm ¦  Forum: Projects ¦  Topic: ADXL345 Digital Inclinometer ¦  Replies: 3 ¦  Views: 824

What value are the I2C pull-ups on both sides of the level converter ? What level converter are you using ?

Re: Beginner question

 by Mee_n_Mac ¦  Wed Mar 04, 2015 9:47 pm ¦  Forum: Arduino ¦  Topic: Beginner question ¦  Replies: 1 ¦  Views: 356

I'd guess the code we don't know anything about is a tad off.

(click on to open)

CodeButtonTags.jpg

Re: Pulling 555 timer reset line low

 by Mee_n_Mac ¦  Wed Mar 04, 2015 9:45 pm ¦  Forum: Arduino ¦  Topic: Pulling 555 timer reset line low ¦  Replies: 10 ¦  Views: 1308

The scheme should work. The reset pin goes (internally) to the base of a PNP transistor and so won't be forcing any voltage onto the pin. I've read that the reset pin is TTL compatible and so any TTL logic 1 voltage should keep the 555 out of reset, any voltage < 0.8v will reset it. Current draw fro...

Re: Problem with cheap (HC-SR04) Ultrasonic Rangefinders

 by Mee_n_Mac ¦  Wed Mar 04, 2015 12:11 am ¦  Forum: Projects ¦  Topic: Problem with cheap (HC-SR04) Ultrasonic Rangefinders ¦  Replies: 9 ¦  Views: 5100

Devantech, who I think was the original designer, still sells them. Beyond that you might peruse the forums at Society of Robots, and see who gets thumbs up vs down. FWIW I've been looking into the electrical designs posted on the WWW (there are a few differing ones) and I'm surprised because not on...

Re: Problem with cheap (HC-SR04) Ultrasonic Rangefinders

 by Mee_n_Mac ¦  Mon Mar 02, 2015 5:57 pm ¦  Forum: Projects ¦  Topic: Problem with cheap (HC-SR04) Ultrasonic Rangefinders ¦  Replies: 9 ¦  Views: 5100

It sounds like some Chinese cloners didn't get the firmware copied correctly. Apparently the "real" SR04's from a couple of companies do time out in the event of a non-detection. I saw a post where the guy ran the 5v power line from a DIO pin and did a power cycle every time this occurred. And then ...

Re: Beagle bone GPIO noise when flicking a fan on and off

 by Mee_n_Mac ¦  Mon Mar 02, 2015 5:12 pm ¦  Forum: Projects ¦  Topic: Beagle bone GPIO noise when flicking a fan on and off ¦  Replies: 6 ¦  Views: 815

What device is making the pulses you wish to count ? How is it's "ground" tied to the BB's "ground" ? How are both tied to the house neutral ?? Without just the signal line connected to the voltage divider, do you get false edges when switching on/off household appliances ? What happens when the sig...

Re: Probem on the thumb joystick

 by Mee_n_Mac ¦  Mon Mar 02, 2015 11:58 am ¦  Forum: SparkFun Product Questions ¦  Topic: Probem on the thumb joystick ¦  Replies: 2 ¦  Views: 259

What joystick ? What are you seeing ? That you move the stick left/right and both outputs change ? By how much ?

Re: [arduino] RF Signal interpreted by Software

 by Mee_n_Mac ¦  Sun Mar 01, 2015 7:11 pm ¦  Forum: Arduino ¦  Topic: [arduino] RF Signal interpreted by Software ¦  Replies: 15 ¦  Views: 957

Here's the Adafruit 4 way fob. The important point is that it uses the aforementioned encoder/decoder sets to ID and "marry" fobs and receivers. Using cheap and "long" range Tx/Rx sets to carry the info.
http://www.adafruit.com/products/1095

Re: Need help with Ardumoto shield

 by Mee_n_Mac ¦  Sun Mar 01, 2015 6:47 pm ¦  Forum: Projects ¦  Topic: Need help with Ardumoto shield ¦  Replies: 8 ¦  Views: 786

I My thinking now is to bite the bullet and go with a servo based platform. They seem to be more expensive, but if I understand correctly, offer greater motor control. I'm not sure you'd fix the problem. You'll trade off Kv variance for variance in the servo reference. Instead, depending on your st...

Re: Need help with Ardumoto shield

 by Mee_n_Mac ¦  Sun Mar 01, 2015 6:32 pm ¦  Forum: Projects ¦  Topic: Need help with Ardumoto shield ¦  Replies: 8 ¦  Views: 786

Well there is some way to separately power the motors but it's a bit irreversible. A voltage named Vin comes in on the Arduino barrel jack. It goes to the onboard regulator and also to pin Vin on the header to the shield. This also goes to power the motors and to the pads you can see below on the sh...

Re: Need help with Ardumoto shield

 by Mee_n_Mac ¦  Sun Mar 01, 2015 5:37 pm ¦  Forum: Projects ¦  Topic: Need help with Ardumoto shield ¦  Replies: 8 ¦  Views: 786

Thanks for the troubleshooting help, mee. Testing pin 13 showed it wouldn't stay high. Not sure if fault was with arduino or the arduino header pins, but swapping out the arduino fixed the issue.. Well that wasn't my 1st guess but whatever works ... Now that I'm running, I noticed the motors suppli...

Re: Need help with Ardumoto shield

 by Mee_n_Mac ¦  Sun Mar 01, 2015 7:16 am ¦  Forum: Projects ¦  Topic: Need help with Ardumoto shield ¦  Replies: 8 ¦  Views: 786

I don't see the SW as the problem so you need to look at the hardware. First thing is to see if the Direction signal for that motor is making it to the shield. If you have a DVM you can measure the voltage at pins 12 (DIRA) and 13 (DIRB) of the shield. You should see 5v for one direction, 0v for the...

Re: MP3 Player Using PIR Sensor 150215

 by Mee_n_Mac ¦  Sat Feb 28, 2015 4:34 pm ¦  Forum: SparkFun Product Questions ¦  Topic: MP3 Player Using PIR Sensor 150215 ¦  Replies: 8 ¦  Views: 1031

The 1st thing to do is make the PIR is working. So disconnect it's output from the rest of the circuit and measure it's output w/the DVM. If needed set the pulse width to it's max. If it outputs a pulse the you need to checkout your BB. It looks OK to me but some measurements will tell us what's hap...

Re: Sketch that once worked, then stopped.

 by Mee_n_Mac ¦  Sat Feb 28, 2015 3:10 pm ¦  Forum: Arduino ¦  Topic: Sketch that once worked, then stopped. ¦  Replies: 2 ¦  Views: 498

There's a default 1 sec timeout on the Serial.parseInt() function. How are you sending the data ? Could it's timing miss the 1'st character but catch the later ones ? Perhaps it's the test conditions / input that's changed from working to non-working ?
http://arduino.cc/en/Serial/ParseInt

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