SparkFun Forums 

Where electronics enthusiasts find answers.

Search found 31 matches

 Go to advanced search

Re: Level shifter BOB-12009

 by liudr ¦  Mon Oct 08, 2018 5:49 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Level shifter BOB-12009 ¦  Replies: 3 ¦  Views: 227

I did some tests with a board I got from amazon or ebay. The design is the same although I don't know if the N-MOSEFTs are the same as sparkfun's ones. The input was 12V square waves at 1KHz between 0V and 12V. I supplied VH with 12V DC, VL with 5V DC. Output pulses are 5V and look decent. https://l...

Re: Level shifter BOB-12009

 by liudr ¦  Sun Oct 07, 2018 9:24 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Level shifter BOB-12009 ¦  Replies: 3 ¦  Views: 227

Thanks. I'm trying to count 12V pulses using 5V arduino. There isn't a reason that it shouldn't work per spec sheet. But it's great to hear real people saying that it works at higher voltages. I have a few "clone" boards I got off amazon. I'll check them with signal generator tomorrow to see how slu...

Level shifter BOB-12009

 by liudr ¦  Sun Oct 07, 2018 6:01 pm ¦  Forum: SparkFun Product Questions ¦  Topic: Level shifter BOB-12009 ¦  Replies: 3 ¦  Views: 227

This should be able to handle 12V->5V shifting, correct?

The data sheet says VGS=+-20V and VDS=50. Thanks.

Re: Any paid service available?

 by liudr ¦  Fri Nov 07, 2014 9:59 pm ¦  Forum: ¦  Topic: Any paid service available? ¦  Replies: 2 ¦  Views: 2218

Well, a few hundred megabytes as a starter. I know making a network server that logs data is not rocket science but no offense to you, how fast can I extract data? I use another service from an individual and the speed is far from good.

Any paid service available?

 by liudr ¦  Thu Nov 06, 2014 10:35 pm ¦  Forum: ¦  Topic: Any paid service available? ¦  Replies: 2 ¦  Views: 2218

I am a big fan of phant. I wonder if there is any way to pay to bump up the 50MB per stream cap for free streams so that I can log more data and possibly query more frequently on the server. SPE has fast servers compared with what I had to use before finding phant. I know phant is still under develo...

Arduino wifi shield questions

 by liudr ¦  Wed Apr 24, 2013 1:39 pm ¦  Forum: Wireless/RF ¦  Topic: Arduino wifi shield questions ¦  Replies: 0 ¦  Views: 485 I have this shield. I also have lots of questions: 1) I tried to get mac address but I can only get it when the shield is connected to a router or otherwise all zeros. Why would wifi.macAddress() not return the MAC address, which should not depend on whether i...

Re: Serial LCD keypad

 by liudr ¦  Sat Dec 03, 2011 6:19 pm ¦  Forum: Arduino ¦  Topic: Serial LCD keypad ¦  Replies: 1 ¦  Views: 636

Here is a video of one panel in action: ... NNvsZH-K1I

Re: Smoothing Ping Sensor Readings

 by liudr ¦  Sat Dec 03, 2011 6:16 pm ¦  Forum: Arduino ¦  Topic: Smoothing Ping Sensor Readings ¦  Replies: 3 ¦  Views: 841

Post a picture. Maybe the sensor has too much stuff surrounding it and they all reflect sound. What happens if you take the sensor and point it to the ceiling? Will it be stable?

Serial LCD keypad

 by liudr ¦  Sat Dec 03, 2011 6:14 pm ¦  Forum: Arduino ¦  Topic: Serial LCD keypad ¦  Replies: 1 ¦  Views: 636

FYI, I have released this family of serial LCD and keypad panels. Asked SPE if they're interested in carrying but received no replies. They're really busy :lol: There are two sizes with integrated keypads and LED, buzzer and there is a back pack version you can plug in a matrix keypad to. Firmware p...

Re: Loading Program on ATmega328 with Arduino Optiboot

 by liudr ¦  Fri Sep 23, 2011 2:08 pm ¦  Forum: Arduino ¦  Topic: Loading Program on ATmega328 with Arduino Optiboot ¦  Replies: 6 ¦  Views: 1466

OP, do you actually have an arduino board? If you do, you can just pop the chip off the board and put the atmega328p with the bootloader on the board to load program, then take it out and put it in a circuit. My short tutorial: What...

20*4 Character LCD shield is out!

 by liudr ¦  Sun Jun 19, 2011 4:49 pm ¦  Forum: Arduino ¦  Topic: 20*4 Character LCD shield is out! ¦  Replies: 0 ¦  Views: 1064

Since my phi-1 and phi-2 shields have been very successful I decided to make a variant of phi-2 shield with 20*4 display area to fully take advantage of my phi_prompt user interface library :

Phi-connect arduino cable/wire management project switching

 by liudr ¦  Sun May 01, 2011 12:29 pm ¦  Forum: Arduino ¦  Topic: Phi-connect arduino cable/wire management project switching ¦  Replies: 0 ¦  Views: 519

This is a new widget I designed to help breadboard prototyping. It passes all Arduino connections to a breadboard (or project box) including connectors to power two breadboard buses with 5V and gnd. Check it out!

Re: Big font on character LCD version 2, now in library

 by liudr ¦  Sun May 01, 2011 12:27 pm ¦  Forum: Arduino ¦  Topic: Big font on character LCD version 2, now in library ¦  Replies: 2 ¦  Views: 1570

thefatmoop wrote:awesome!

Now behold the super font!
This library is also available on my blog:

Big font on character LCD version 2, now in library

 by liudr ¦  Wed Apr 20, 2011 5:43 pm ¦  Forum: Arduino ¦  Topic: Big font on character LCD version 2, now in library ¦  Replies: 2 ¦  Views: 1570

After some initial success with big fonts (2 rows and 3 columns in size) on character lcds, I revised my code and created a library for it. You can use it to display time, or other stuff you can see from much further away compared with standard fonts. Pic:

Re: Arduino car backing reverse obstacle sensor

 by liudr ¦  Wed Feb 16, 2011 3:00 pm ¦  Forum: Arduino ¦  Topic: Arduino car backing reverse obstacle sensor ¦  Replies: 2 ¦  Views: 1326

Sweet, project. I wanted to make one for work attached to the MP3 shield that screams at people for walking near my truck. I always want to get a big horn in the back of my car so I can honk at someone behind me! If you want to use the Phi-1 shield, make sure your mp3 shield is compatible with the ...