Search found 1038 matches

by n1ist
Sun Jan 20, 2019 12:13 pm
Forum: General Chit Chat
Topic: Suggestions for components to read and respond to Voltage input
Replies: 1
Views: 41

Re: Suggestions for components to read and respond to Voltage input

Look at the LM311 comparator (https://www.sparkfun.com/products/13950) Feed your voltage into the positive input and feed the negative input from a pot set up as a voltage divider to set the trip point.
/mike
by n1ist
Wed Jan 09, 2019 9:57 pm
Forum: SparkFun Product Questions
Topic: Generic connector part #
Replies: 1
Views: 29

Re: Generic connector part #

Digikey A26962-ND (TE/Amp 7-87499-2) housing with A25969CT-ND (87756-4) pins looks like them.
/mike
by n1ist
Tue Jan 01, 2019 1:37 pm
Forum: SparkFun Product Questions
Topic: Qwiic Twist - RGB Rotary Encoder Breakout code function not working correctly
Replies: 16
Views: 200

Re: Qwiic Twist - RGB Rotary Encoder Breakout code function not working correctly

The source for the tiny84 is in the linked GITHUB repository. Looking quickly at it shows physical buttons connected to interrupt pins, and minimal, if any, debouncing...
/mike
by n1ist
Mon Dec 24, 2018 9:31 am
Forum: PCB Design Questions
Topic: PCB Copper Trace Finish
Replies: 2
Views: 54

Re: PCB Copper Trace Finish

There are two parts to this. - You specify the lack of a mask by creating a void in the solder mask layer on your board; from a previous post with this question: I'm not sure if there is a direct way to do it with the trace properties but what you can do is draw an identical wire on top of the trace...
by n1ist
Sat Nov 24, 2018 1:13 pm
Forum: Arduino
Topic: Shift Register + Potentiometer
Replies: 2
Views: 73

Re: Shift Register + Potentiometer

To do it in hardware, I would follow darrellg's advice. If the Arduino isn't busy doing too many other things, I would do the PWM in software; have the timer generate an interrupt that bumps a counter; at each tick, have it check the 7 PWM values and set the output pin corresponding to each one base...
by n1ist
Sat Nov 24, 2018 12:46 pm
Forum: Projects
Topic: Beam-break sensor w/ reflector panel
Replies: 6
Views: 160

Re: Beam-break sensor w/ reflector panel

It will be a challenge over that distance in daylight. Here are a few ideas; I know you don't want to do some but they may be needed... - Optics - You need to shield the sensor from extraneous light, and try to increase the amount of light you are collecting. Try a paper towel tube with the inside p...
by n1ist
Sun Oct 14, 2018 10:39 am
Forum: SparkFun Product Questions
Topic: How do you program something like this?
Replies: 9
Views: 439

Re: How do you program something like this?

Some Bluetooth (or WiFi or ZigBee) modules are not intended to be user-programmed; they come preprogrammed with a processor that has a serial interface of some sort, and only intend you to use it as a peripheral. The one you mentioned is in this category. Others (ie. ones based on the Nordic or Sili...
by n1ist
Thu Oct 11, 2018 2:39 pm
Forum: PCB Design Questions
Topic: Review my PCB
Replies: 3
Views: 479

Re: Review my PCB

Oops. I didn''t recognize the word salad shilling for the PCB house.
by n1ist
Tue Oct 09, 2018 7:42 pm
Forum: PCB Design Questions
Topic: Review my PCB
Replies: 3
Views: 479

Re: Review my PCB

The images are not showing up, and when I try to open them manually, I get "You are not authorised to download this attachment"
/mike
by n1ist
Sat Sep 29, 2018 9:19 am
Forum: Projects
Topic: "Power back on" sensor/notifier
Replies: 4
Views: 227

Re: "Power back on" sensor/notifier

Have an electrician install an outlet on the utility side of the transfer switch (you may need a separate fuse for it). Then plug in a wall wart and connect its output to the I/O pin on the arduino thru an optoisolator or divider. If the wallwart is on, utility power is on.
by n1ist
Fri Sep 28, 2018 6:06 am
Forum: Wireless/RF
Topic: Looking for NBFM receiver chip
Replies: 1
Views: 317

Looking for NBFM receiver chip

I am looking for an NBFM receiver chip to be able to receive from a vhf wireless microphone (around 200 MHz). In the past, I would have gone with the old Motorola or National parts (like the MC3362, as used in many scanners) but they seem to have all vanished. I have checked SiLabs, but they only ha...
by n1ist
Mon Sep 24, 2018 5:51 pm
Forum: Arduino
Topic: Location are not accurate GPS neo6m
Replies: 3
Views: 352

Re: Location are not accurate GPS neo6m

joyknights wrote:
Sun Sep 23, 2018 6:40 pm
Is that the reason why his location is incorrect?
No, but it lets the program be properly formatted so people are more likely to look at the code and hopefully see what's wrong.
/mike
by n1ist
Mon Sep 10, 2018 3:48 am
Forum: Arduino
Topic: Trouble with my AVR MK II
Replies: 6
Views: 525

Re: Trouble with my AVR MK II

Try posting at www.avrfreaks.net
/mike
by n1ist
Thu Sep 06, 2018 5:05 am
Forum: SparkFun Product Questions
Topic: Modifying a Board for Enclosure
Replies: 3
Views: 167

Re: Modifying a Board for Enclosure

To answer the first question: - You can remove the buttons and connect new ones in their place (as long as they have the same or a compatible contact arrangement ie. both normally open, or use a form-c instead of NO or NC) - If the buttons are normally open, you can connect the new ones in parallel....
by n1ist
Thu Sep 06, 2018 5:01 am
Forum: General Chit Chat
Topic: Can this be used as I2C Master?
Replies: 5
Views: 1205

Re: Can this be used as I2C Master?

You can always use a SOC that has both a radio and Bluetooth (nRF52832, EFR32 or ESP32 comes to mind) but that will be much more work than a small micro that acts as an i2c master.
/mike