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Re: Seeking Retired Product: GPS-11058

 by darrellg ¦  Thu May 02, 2019 1:38 pm ¦  Forum: Retired Products ¦  Topic: Seeking Retired Product: GPS-11058 ¦  Replies: 3 ¦  Views: 88

The design files are all available on the product page at You could roll your own if you can't find any second hand.

Re: Unable to register to forums

 by darrellg ¦  Thu May 02, 2019 11:00 am ¦  Forum: Miscellaneous ¦  Topic: Unable to register to forums ¦  Replies: 4 ¦  Views: 72

He's right, there is a problem with the forum setup. When you go to the signup page, you first see this: terms.PNG After you click through that, you see this: Select.PNG If you select American English on that page, you are immediately kicked back to the first screen again. It's not preventing anyone...

Re: RGB LED programming help... Newbie :)

 by darrellg ¦  Wed May 01, 2019 2:38 pm ¦  Forum: LEDs, Illumination, & lasers ¦  Topic: RGB LED programming help... Newbie :) ¦  Replies: 2 ¦  Views: 48

Re: SparkFun Mechanical Ecosystem

 by darrellg ¦  Fri Apr 19, 2019 2:14 pm ¦  Forum: General Chit Chat ¦  Topic: SparkFun Mechanical Ecosystem ¦  Replies: 3 ¦  Views: 57

Eagle can export DXF and STEP files.

Re: No Resistor When Vf = Vin?

 by darrellg ¦  Thu Apr 18, 2019 1:43 pm ¦  Forum: LEDs, Illumination, & lasers ¦  Topic: No Resistor When Vf = Vin? ¦  Replies: 4 ¦  Views: 78

Unless you are using a current limited power source, your LED needs a series resistor to limit the current. It is not a resistive load (like an incandescent bulb), it is a diode. Once Vf has been reached, nothing will limit the current. The reason you can use a coin cell without a resistor is that t...

Re: Pro Micro "USB device not recognised" after loading sketch

 by darrellg ¦  Mon Apr 15, 2019 9:04 am ¦  Forum: Arduino ¦  Topic: Pro Micro "USB device not recognised" after loading sketch ¦  Replies: 3 ¦  Views: 77

There's a step-by-step for reviving a bricked ProMicro at ... ng-and-faq.

Try commenting out sections of your code until it stops bricking the ProMicro, then focus on that section to find the problematic code.

Re: Large Digit Driver Raspberrypi

 by darrellg ¦  Thu Apr 11, 2019 10:45 am ¦  Forum: Displays ¦  Topic: Large Digit Driver Raspberrypi ¦  Replies: 9 ¦  Views: 213

It's good to know that it works at 3.3V. However, section 8.4.1 of the datasheet for the shift register says This device works normally during 4.5 V ≤ V(VIN) ≤ 5.5 V, when operation voltage is lower than 4.5 V. The behavior of device can't be ensured, including communication interface and current ca...

Re: Is there any interrupt pin on Lilypad Arduino Simple

 by darrellg ¦  Wed Apr 10, 2019 10:00 am ¦  Forum: Lilypad & E-textiles ¦  Topic: Is there any interrupt pin on Lilypad Arduino Simple ¦  Replies: 7 ¦  Views: 132

Google arduino pin change interrupt

Re: LCD-14072 Mechanical Drawing

 by darrellg ¦  Tue Apr 02, 2019 1:22 pm ¦  Forum: Displays ¦  Topic: LCD-14072 Mechanical Drawing ¦  Replies: 2 ¦  Views: 95

That'll help. Thanks!

LCD-14072 Mechanical Drawing

 by darrellg ¦  Tue Apr 02, 2019 11:17 am ¦  Forum: Displays ¦  Topic: LCD-14072 Mechanical Drawing ¦  Replies: 2 ¦  Views: 95

Is there a mechanical drawing or Eagle file available for LCD-14072 or LCD-14073? It's easy enough to use calipers and draw my own, but I'm lazy and I won't if I don't need to. I found the Fritzing part, but I don't use Fritzing.

Re: Data Storage

 by darrellg ¦  Thu Mar 21, 2019 9:29 am ¦  Forum: Miscellaneous ¦  Topic: Data Storage ¦  Replies: 3 ¦  Views: 93

Something like is what you're looking for.

Re: XA1110 Titan X1 no pps?

 by darrellg ¦  Mon Mar 11, 2019 9:36 am ¦  Forum: Global Positioning System(GPS) ¦  Topic: XA1110 Titan X1 no pps? ¦  Replies: 2 ¦  Views: 69

How long did you wait? It can take up to 20-30 minutes of clear sky view to receive all of the ephemeris data needed for normal operation. Many people expect it to work instantaneously like a cellphone, and are not aware that a cell phone downloads the ephemeris data from the cell network.

Re: Temperature Sensor Differences

 by darrellg ¦  Mon Mar 11, 2019 9:19 am ¦  Forum: Temperature & humidity ¦  Topic: Temperature Sensor Differences ¦  Replies: 2 ¦  Views: 70

SEN-14049 provides a digital temperature reading over a 1-wire bus.

TMP36 provides an analog voltage output that is proportional to the temperature.

Re: New forum color scheme

 by darrellg ¦  Fri Mar 08, 2019 10:21 am ¦  Forum: General Chit Chat ¦  Topic: New forum color scheme ¦  Replies: 8 ¦  Views: 275

It's also very difficult to tell which forum have new posts. The gray/slightly darker gray contrast of the folder icons is insufficient.

Re: Large Digit Driver Raspberrypi

 by darrellg ¦  Thu Mar 07, 2019 11:18 am ¦  Forum: Displays ¦  Topic: Large Digit Driver Raspberrypi ¦  Replies: 9 ¦  Views: 213

Adafruit just released a new RPi GPIO expander that also does 5V logic levels by default. It's only $10. It would probably work well for your project. ... t?view=all

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