Search found 114 matches

by 8Volts
Sun Oct 07, 2018 8:11 am
Forum: Projects
Topic: LED DRIVERS ?
Replies: 0
Views: 275

LED DRIVERS ?

Hello, I am looking to make my own LED lightbulbs that can screw in a traditional 120VAC household socket. So to start, I have realized that I need a LED driver to drive constant current to my leds. I found a constant current LED driver kit in the Sparkfun websit: https://www.sparkfun.com/products/1...
by 8Volts
Tue Feb 06, 2018 12:15 pm
Forum: SparkFun Product Questions
Topic: INA169
Replies: 4
Views: 223

Re: INA169

Ok thank you very much Paulvha

Your help is very appreciated
8V
by 8Volts
Mon Feb 05, 2018 10:35 am
Forum: SparkFun Product Questions
Topic: INA169
Replies: 4
Views: 223

Re: INA169

Hello paulvha, Thank you for your reply! So if I understand correctly.... I will not be able to monitor the full 0-1A range! Given the the lowest shunt voltage allowable of 50mv would give me arespective current of: @50mv >>> I=V/R = 50mv/0.3ohms = ~166ma Applying this to their formula to get my vol...
by 8Volts
Sun Feb 04, 2018 8:38 am
Forum: SparkFun Product Questions
Topic: INA169
Replies: 4
Views: 223

INA169

Hi folks, I am looking into using the INA169 part to make a current measuring circuit... heres the link to the hook uo guide: https://learn.sparkfun.com/tutorials/ina169-breakout-board-hookup-guide?_ga=2.162713596.1321664697.1517757853-42432521.1481576911 I was just wondering if I am calculating RS ...
by 8Volts
Wed Jan 10, 2018 9:03 am
Forum: PCB Design Questions
Topic: Which PCB layout software should I use?
Replies: 6
Views: 993

Re: Which PCB layout software should I use?

Anyone
Anyone at aalll???
😳
by 8Volts
Tue Jan 09, 2018 5:15 pm
Forum: PCB Design Questions
Topic: Which PCB layout software should I use?
Replies: 6
Views: 993

Which PCB layout software should I use?

Hello, I was thinking to try and do my own PCB layouts myself And then generate the gerber files so I can Give them to my PCB manufacturer. But I never used such a software and I would like to ask this forum which one I should use? It should allow me to design layouts from the smallest To the bigges...
by 8Volts
Tue Oct 24, 2017 2:57 pm
Forum: Projects
Topic: Minimal distance digital circuits next to AC power line
Replies: 1
Views: 341

Minimal distance digital circuits next to AC power line

Hi,

I have many I/O lines coming from an MCU
which are laid out one next
to each other on a PC board. However I
Will require small metal pegs residing perpendicular
To the pc board. What should be the minimal
distance between the pegs to the digital traces
be?

Pc board with one peg below:

by 8Volts
Wed May 31, 2017 9:35 am
Forum: Wireless/RF
Topic: Mesh RF eval board?
Replies: 2
Views: 677

Mesh RF eval board?

Hello, I am looking to buy the following evaluation board from SF: https://learn.sparkfun.com/tutorials/atmega128rfa1-dev-board-hookup-guide?_ga=2.130719951.1783696041.1496171307-42432521.1481576911 But the only problem is that the sparkfun tutorial at best shows how two of these would communicate. ...
by 8Volts
Sun Apr 27, 2014 11:07 am
Forum: Projects
Topic: Why no short?
Replies: 3
Views: 345

Re: Why no short?

okay, that makes sense!

thanks for your help skimask!
by 8Volts
Sat Apr 26, 2014 12:26 pm
Forum: Projects
Topic: Why no short?
Replies: 3
Views: 345

Why no short?

Hello, I am using a CD74HC243 quad bus transceiver chip. In the input of a buffer, I applied a 3.3Vdc while keeping its respective output grounded. I was just curious as to why the chip is able to handle this without burning up. When the 3.3VDC passes from B0 to A0, doesn't this make a short?? Pleas...
by 8Volts
Wed Jan 29, 2014 11:44 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: LATFCLR, LATFSET and LATFINV?
Replies: 0
Views: 480

LATFCLR, LATFSET and LATFINV?

Hi,

Does anyone know how to use LATFCLR, LATFSET and LATFINV hardware registers to do atomic IO operations in PIC32.

I am looking for some examples on how to toggle on and off a pin!

Thanks
by 8Volts
Sat Jan 25, 2014 4:19 pm
Forum: PIC Microcontrollers - Software and Hardware
Topic: Pic32 is slow?
Replies: 7
Views: 1947

Re: Pic32 is slow?

Hi waltr, I am currently using MikroElektronika's C compiler. And I have ran the following code: with a 3.3 MHZ at the output pin, here's the code: void main(){ do { iO_PIN33_G1CR = 0; // Turn off iO_PIN33_G1CR = 0; // Turn off iO_PIN33_G1CR = 1; // Turn on iO_PIN33_G1CR = 1; // Turn on } while(TRUE...
by 8Volts
Sat Jan 25, 2014 12:17 pm
Forum: PIC Microcontrollers - Software and Hardware
Topic: Pic32 is slow?
Replies: 7
Views: 1947

Pic32 is slow?

Hello, I am toggling a pin from high to low in a closed continuous loop, I measure approximately a frequency of 3MHZ. Why is PIC32 so slow? I have read that there are ways to configure wait states and prefetch operations in order to get the Pic to perform a lot more efficiently but I find no example...
by 8Volts
Mon Jan 20, 2014 9:36 pm
Forum: Projects
Topic: 144 pin package to Pdip converter?
Replies: 1
Views: 600

144 pin package to Pdip converter?

Hello, I am currently breadboarding with traditional Bread boards of 0.1" pitch (from hole to hole). I have a convertor custom made that converts A 100 pin tqfp to pdip so it can for in my traditional Bread board which is 63x2 wide. However, what happens if one want to breadboard a part that had 144...
by 8Volts
Fri Dec 06, 2013 12:18 am
Forum: PIC Microcontrollers - Software and Hardware
Topic: Should we use malloc in MCUs?
Replies: 9
Views: 2269

Re: Should we use malloc in MCUs?

These days, it might be easier to just get a micro with a bigger memory, as 64K or 128K is not all that expenisve, and still have lots of Flash for code. which is my case.... Pic32... soon 0.5 meg of ram!! How could mallocing a few 5k blocks be a problem? I'm debating.... :think: thanks all for you...