Search found 17 matches

by distro inferno
Wed Aug 02, 2017 1:49 pm
Forum: Everything ARM and LPC
Topic: Kinetis K20 questions (board components, programming)
Replies: 1
Views: 1000

Re: Kinetis K20 questions (board components, programming)

I think you've got most of what you need right there. Lay it out with a crystal, access to JTAG pins, access to all other pins you need, decoupling caps on the power supply pins. You can compare with the layouts on any open source boards that use it, I believe the Teensy boards may have their layout...
by distro inferno
Thu Mar 30, 2017 5:54 pm
Forum: Wireless/RF
Topic: Best way to send a measurement from ESP8266 to a computer?
Replies: 3
Views: 1243

Best way to send a measurement from ESP8266 to a computer?

I am trying to send several measurements (ints, floats) over wifi to another computer on the network, using the ESP8266 Thing Dev board. I can use a simple website hosted by the ESP to display the values as text, then pull that and parse it on a server, however I need to keep the ESP in deep sleep m...
by distro inferno
Mon Feb 13, 2017 4:25 pm
Forum: SparkFun Site Questions/Comments
Topic: What determines the order of comments on a product?
Replies: 0
Views: 817

What determines the order of comments on a product?

When I post a comment on a product I notice that my post will be sandwiched in between a post from 6 years ago, and one from 4 years ago, with mine timestamped in the last few seconds. What determines the order that comments appear under products? When I am considering buying something I'd like to s...
by distro inferno
Mon Sep 12, 2016 12:00 pm
Forum: data.sparkfun.com
Topic: Do private Phant servers have a rate limit?
Replies: 0
Views: 1010

Do private Phant servers have a rate limit?

I'm trying to post 600 integers per second to Phant, which isn't possible on data.sparkfun.com because they implement rate limiting of 100 posts per 15 minutes according to the documentation. Also, concatenating the data into fewer posts is probably not possible because it all gets sent as one giant...
by distro inferno
Fri Sep 09, 2016 4:17 pm
Forum: data.sparkfun.com
Topic: launching Phant on your own server
Replies: 9
Views: 4775

Re: launching Phant on your own server

No luck here either. Installed nodejs and "npm install -g phant"... I can telnet to 8081 and run commands but http to 8080 does nothing, just blank screen. I can 'create' a stream and get keys for it over the telnet client, but I don;t seem to be able to post data via http as in the docs using the ...
by distro inferno
Fri Sep 09, 2016 2:05 pm
Forum: data.sparkfun.com
Topic: launching Phant on your own server
Replies: 9
Views: 4775

Re: launching Phant on your own server

I also want to ask anyone who successfully got Phant running on a local server how much speedup they notice in data throughput. Right now I'm trying to get an ESP8266 Thing Dev to post lots of data to Phant, but I need much higher throughput than I'm getting using data.sparkfun.com. I'll be taking 1...
by distro inferno
Fri Sep 09, 2016 1:48 pm
Forum: Arduino
Topic: Building a "buffer" to increase signal's voltage.
Replies: 6
Views: 878

Re: Building a "buffer" to increase signal's voltage.

It seems like a voltage-follower op-amp configuration would work just fine, if you can keep the "skew" low. An op-amp that is too slow would create a delay in the rise and fall time of the clock signal- skew is basically the volts-per-second transition capability of the output of the buffer or volta...
by distro inferno
Tue Aug 30, 2016 6:32 pm
Forum: Arduino
Topic: So much about the ESP8266 code is hidden
Replies: 2
Views: 782

So much about the ESP8266 code is hidden

I'm having trouble understanding how code like this can work: (from https://github.com/esp8266/Arduino/blob/master/libraries/ESP8266WiFi/examples/WiFiClientEvents/WiFiClientEvents.ino ): /* * This sketch shows the WiFi event usage * */ #include <ESP8266WiFi.h> const char* ssid = "your-ssid"; const c...
by distro inferno
Mon Aug 29, 2016 4:16 pm
Forum: Arduino
Topic: ESP8266 running old code after new code is uploaded
Replies: 0
Views: 333

ESP8266 running old code after new code is uploaded

I'm using the ESP8266 Thing Dev board and trying to load different arduino example programs on it. The first program I put on is the Sparkfun AP Web Server example sketch from https://learn.sparkfun.com/tutorials/esp8266-thing-hookup-guide/all#example-sketch-ap-web-server . That worked great and cre...
by distro inferno
Sat Jun 18, 2016 11:31 am
Forum: Projects
Topic: Powering multiple high power LEDs
Replies: 1
Views: 411

Re: Powering multiple high power LEDs

If the Femtobuck can handle 30W of power (and you should derate that to choose a part that can handle, say, 35-40W just in case) then it would work. Be sure to have good heat dissipation pathways ready because those things will get quite hot- both the LEDs and the buck converter, depending on how ef...
by distro inferno
Sat Jun 18, 2016 11:19 am
Forum: General Chit Chat
Topic: I made this compact AA boost circuit
Replies: 1
Views: 2814

Re: I made this compact AA boost circuit

Looks nice. What efficiency % were you able to reliably achieve for 3.3V and 5V?
by distro inferno
Sat Jun 18, 2016 9:56 am
Forum: General Chit Chat
Topic: SIMetrix/Simplis simulations: creating new parts
Replies: 1
Views: 2670

SIMetrix/Simplis simulations: creating new parts

Howdy, has anyone here used the SIMetrix Simplis circuit simulation tool? It's like LTSpice or other spice modeling sims. I've been trying to create my own parts, and that has worked well, but now I want to use variables in the circuit models and have the user select values from a drop-down menu for...
by distro inferno
Sun Nov 01, 2015 12:26 pm
Forum: General Chit Chat
Topic: Collimated Light Source
Replies: 4
Views: 4571

Re: Collimated Light Source

haedon I'm not sure if that's what Oberon means.

Putting an LED inside a reflective tube that extends out an inch or so from the LED may collimate the beam enough for you.
by distro inferno
Sun Nov 01, 2015 12:24 pm
Forum: General Chit Chat
Topic: Fan type help.
Replies: 1
Views: 4129

Re: Fan type help.

These images are too small to see clearly but it looks like the SEN line out of pin 3 goes to a bus- is it an I2C bus? The datasheets for the fans aren't too helpful in that regard, and I would need to see the rest of that schematic in your second image to figure it out. Each fan is about $9, can yo...