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Re: Kinetis K20 questions (board components, programming)

 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: 1140

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...

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

 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: 1359

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...

What determines the order of comments on a product?

 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: 925

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...

Do private Phant servers have a rate limit?

 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: 1114

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...

Re: launching Phant on your own server

 by distro inferno ¦  Fri Sep 09, 2016 4:17 pm ¦  Forum: data.sparkfun.com ¦  Topic: launching Phant on your own server ¦  Replies: 9 ¦  Views: 5034

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 ...

Re: launching Phant on your own server

 by distro inferno ¦  Fri Sep 09, 2016 2:05 pm ¦  Forum: data.sparkfun.com ¦  Topic: launching Phant on your own server ¦  Replies: 9 ¦  Views: 5034

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...

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

 by distro inferno ¦  Fri Sep 09, 2016 1:48 pm ¦  Forum: Arduino ¦  Topic: Building a "buffer" to increase signal's voltage. ¦  Replies: 6 ¦  Views: 990

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...

So much about the ESP8266 code is hidden

 by distro inferno ¦  Tue Aug 30, 2016 6:32 pm ¦  Forum: Arduino ¦  Topic: So much about the ESP8266 code is hidden ¦  Replies: 2 ¦  Views: 873

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...

ESP8266 running old code after new code is uploaded

 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: 364

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...

Re: Powering multiple high power LEDs

 by distro inferno ¦  Sat Jun 18, 2016 11:31 am ¦  Forum: Projects ¦  Topic: Powering multiple high power LEDs ¦  Replies: 1 ¦  Views: 428

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...

Re: I made this compact AA boost circuit

 by distro inferno ¦  Sat Jun 18, 2016 11:19 am ¦  Forum: Forum ¦  Topic: I made this compact AA boost circuit ¦  Replies: 1 ¦  Views: 2857

Looks nice. What efficiency % were you able to reliably achieve for 3.3V and 5V?

Re: SIMetrix/Simplis simulations: creating new parts

 by distro inferno ¦  Sat Jun 18, 2016 9:56 am ¦  Forum: Forum ¦  Topic: SIMetrix/Simplis simulations: creating new parts ¦  Replies: 1 ¦  Views: 2798

The rest of the images:

SIMetrix/Simplis simulations: creating new parts

 by distro inferno ¦  Sat Jun 18, 2016 9:56 am ¦  Forum: Forum ¦  Topic: SIMetrix/Simplis simulations: creating new parts ¦  Replies: 1 ¦  Views: 2798

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...

Re: Collimated Light Source

 by distro inferno ¦  Sun Nov 01, 2015 12:26 pm ¦  Forum: Forum ¦  Topic: Collimated Light Source ¦  Replies: 4 ¦  Views: 4744

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.

Re: Fan type help.

 by distro inferno ¦  Sun Nov 01, 2015 12:24 pm ¦  Forum: Forum ¦  Topic: Fan type help. ¦  Replies: 1 ¦  Views: 4202

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...