Search found 1009 matches

by n1ist
Tue May 22, 2018 6:44 am
Forum: Projects
Topic: using an arduino mini in combination with a MAG3110 Magnetometer
Replies: 2
Views: 40

Re: using an arduino mini in combination with a MAG3110 Magnetometer

There are two issues - level shifting and supplying the power to the level shifter and magnetometer.
I would use a voltage regulator like the 1117 (like https://www.sparkfun.com/products/526 or https://www.sparkfun.com/products/8376) to convert the 5v to 3.3v.

/mike
by n1ist
Mon May 21, 2018 6:08 am
Forum: Arduino
Topic: Having tropuble understanding RFID module schematic
Replies: 1
Views: 19

Re: Having tropuble understanding RFID module schematic

Looking at your picture, connect + to 5v, - to ground, and TX to RX on the Arduino
/mike
by n1ist
Mon May 21, 2018 5:05 am
Forum: SparkFun Product Questions
Topic: Potentiometer on Sunny Buddy
Replies: 1
Views: 24

Re: Potentiometer on Sunny Buddy

Looking at the picture, it's the white square component with a screwdriver slot, next to the dc power jack, by the row of 4 pth connections (next to "SET")
by n1ist
Sun May 13, 2018 2:21 pm
Forum: Projects
Topic: Controlling SS on SPI with an Atmega328p
Replies: 1
Views: 73

Re: Controlling SS on SPI with an Atmega328p

The pullup resistor (the 10k between the pin and 3.3v) is a lot weaker than the drivers inside the chip. If the 328's pin is in input mode (like it is during reset or ISP), the pullup will make the signal high so the other SPI devices all leave the bus alone. When the 328 is outputting a low, it wil...
by n1ist
Mon May 07, 2018 6:49 pm
Forum: Projects
Topic: project problem
Replies: 3
Views: 132

Re: project problem

It's nice to make things generic, but in this case, I would simplify things. Definitely no need to bother with floats for this. if (updateNow) { temp = score; for (ii = 0; ii < 3; ii++) { postNumber(temp % 10, false); temp /= 10; } temp = overs; for (ii = 0; ii < 2; ii++) { postNumber(temp % 10, fal...
by n1ist
Wed May 02, 2018 7:00 am
Forum: Arduino
Topic: No Response from Hardware (Hardware not Broken)
Replies: 3
Views: 105

Re: No Response from Hardware (Hardware not Broken)

A few things - use code tags when posting code so that indentation is maintained; it makes it easier to read - = is an assignment, == is a comparison so if (Latch = true) {} will set latch to true and then always do the if since true is true... - strip.begin() only needs to be executed once, so it s...
by n1ist
Sun Apr 29, 2018 5:21 pm
Forum: Projects
Topic: External Memory Device for 8-Bit Computer?
Replies: 4
Views: 128

Re: External Memory Device for 8-Bit Computer?

It's a 4-channel counter-timer chip; Zilog's answer to the 8253
by n1ist
Thu Apr 26, 2018 6:18 pm
Forum: Projects
Topic: Need help determining a circuit
Replies: 2
Views: 98

Re: Need help determining a circuit

Capture2.JPG
Based on the table you gave, this will work (actually, mode could be an SPDT as user A lights the red light regardless of the position of the mode switch)
/mike
by n1ist
Thu Apr 26, 2018 12:44 pm
Forum: SparkFun Product Questions
Topic: crypto hardware
Replies: 2
Views: 127

Re: crypto hardware

Looks like all the parts for the crypto shield are still available on Digikey/Arrow/etc so it shouldn't be too hard to spin your own version of that board...
by n1ist
Fri Apr 20, 2018 4:41 am
Forum: Arduino
Topic: Lighting a Led with Arduino
Replies: 1
Views: 78

Re: Lighting a Led with Arduino

You would use a transistor between the Arduino and the LED. I'd choose an N-channel mosfet like https://www.sparkfun.com/products/10213 (https://www.sparkfun.com/products/12959 on a PCB, https://www.sparkfun.com/products/10618 on a shield; if you don't use a PC power supply, you can run all channels...
by n1ist
Thu Apr 12, 2018 7:44 pm
Forum: SparkFun Product Questions
Topic: SparkFun Power Driver Shield; Possible 6 ch @ 12V?
Replies: 1
Views: 105

Re: SparkFun Power Driver Shield; Possible 6 ch @ 12V?

Sure, but the ATX connector would need to be rewired. The mosfets are low-side switches, so they will work with any rail below their voltage rating.
/mike
by n1ist
Mon Apr 09, 2018 5:21 pm
Forum: PCB Design Questions
Topic: PCM1803A Breakout? figure out the parts list..
Replies: 5
Views: 252

Re: PCM1803A Breakout? figure out the parts list..

These parts come from the manufacturer in little pockets on a tape, rolled on a reel (similar to old 8mm movie film...). These reels can be placed in automated machines that will remove the parts from the tape and place them on the bare board (with solder paste applied) for reflow soldering. Of cour...
by n1ist
Thu Apr 05, 2018 3:49 pm
Forum: SparkFun Product Questions
Topic: Qwiic relay - not safe for 120V
Replies: 1
Views: 129

Re: Qwiic relay - not safe for 120V

They have updated the description to now state that this board should not be used for high voltage switching.

Thanks.
/mike
by n1ist
Thu Apr 05, 2018 7:37 am
Forum: SparkFun Product Questions
Topic: Qwiic relay - not safe for 120V
Replies: 1
Views: 129

Qwiic relay - not safe for 120V

I just took a look at the Eagle files for the Qwiic relay (SPX-14668). There is a ground pour 12 mils away from the pads on the relay and associated connector. This is insufficient clearance for 120v and can easily arc over, causing a fire or the loss of isolation (and therefore shock or worse) from...
by n1ist
Fri Mar 23, 2018 4:42 am
Forum: SparkFun Product Questions
Topic: MP3 Trigger... Can it signal when a song is over?
Replies: 1
Views: 87

Re: MP3 Trigger... Can it signal when a song is over?

According to the documentation, it will send an X on the serial port when the track is over. Since you have the Arduino, I would hook the serial port on the MP3 trigger to the Arduino (soft serial is fine; there's very little data going over that port) and talk to it that way rather than bother havi...