Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [sparkfun]

59 questions
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Sparkfun RS232 Shifter SMD TTL Waveform DC Offset

[updated with final, working waveform at end of question] I've been trying to connect some automotive gear with a Teensy 3.2 for serial communication at 19200 baud. To interface between RS232 and TTL logic, I'm using this shifter from…
ohhorob
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Which Eagle part to use for this 2-pin Screw Terminal?

This is my first EAGLE design and I'm looking to add some a number of 2-position screw terminals (3.5mm pitch) PRT-08084. Problem: I can find the EAGLE part for the 3-position variant named as M03SCREW_LOCK from the Sparkfun EAGLE library. However I…
Nyxynyx
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CAN bus simulation (automotive purpose) - tried Arduino and SparkFun

I repair electric powered steering systems for cars, especially Fiat, Alfa, and Lancya (Delphi manufacturers), and I'm in need of making some tool to test these reparations. I mean just turning it on, for example. I have researched during some time,…
Aaron Aguayo Martinez
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Power selection circuit for USB or DC Jack - both at 5V

I am designing a new board, where I need to detect if the DC input jack for powering the board has been plugged and then disconnect the USB power supply. I also need to detect it with the uC in order to enable some functions when I have a power…
sanotronics
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ESP32 microcontroller generates noise on microphone

I am trying to build a device for monitoring ambient noise in a room. I am using SparkFun ESP32 Thing MCU together with SparkFun Sound Detector(electret mic + opamp LMV324m). Nothing fancy, just read output from microphone with ADC. My…
Parrrot
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Arduino powered relay behaving oddly

I bought a spark fun inventors kit in order to learn about arduino. I am attempting to complete circuit 13 http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Kits/SFE03-0012-SIK.Guide-300dpi-01.pdf . It is a circuit to control 2 LEDs using a relay. I…
MichelleJS
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Where to find Sparkfun's 1.0mm pitch connectors?

I'm trying to buy these recently stocked connectors from Sparkfun from either Farnell or Digikey, but have no idea what they are called or how to find them. Also, what about the female connector that mates to this? And would I be easily (without an…
cksa361
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Logic Level Translator Operation

I'm trying to analyze the Sparkfun Logic Level converter found here: https://www.sparkfun.com/products/12009 A rough schematic is shown below: simulate this circuit – Schematic created using CircuitLab Now, I've looked at the application note…
BestQualityVacuum
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How to compensate for weather changes in barometric pressure sensor (BMP180)?

I am using BMP180 barometric pressure sensor on an elevator for extended periods (months together), below is the guidance from Sparkfun. Sparkfun guidance: “You should also remember that pressure changes due to weather will affect your altitude…
user18197
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Is my SparkFun RS232 Shifter SMD faulty?

Product Link I am connecting this to an Arduino. (once Arduino programmed I removed the USB connector as it shares the serial comms with Pin0&1) RS232<->Arduino VCC <-> 5V GND <-> GND TX <->Pin0(RX) RX <->Pin1(TX) Seems simple enough. However when…
Richard Freedman
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how do I change baud rate for bluesmirf without connecting to pc?

Hi I have the sparkfun bluetooth mate silver. I am trying to start working on control via bluetooth for my Arduino. Only thing is I need to set the baud rate for the bluetooth mate, all guides I can find on the net show how to change it via pc. I do…
Mark W
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Sparkfun's Uberboard HELP

I bought the Sparkfun's Uberboard a while back and I was trying to run the "Bootloader Tutorial" I followed all the instructions, got the FW.SFE file, but when the Uberboard resets it does not load the code. I got the following: SparkFun USB…
Abelardo
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Using ptr-10401 LiPo Charger on a 24.8 Whr battery

I just got in a LiPo charger (ptr-10401) and I want to use it to (yes I know slowly) charge a 24.8 Whr Lithium Polymer battery. My question is pretty simple. Does this device contain the required logic to safely charge this battery? Meaning, if I…
DotNetRussell
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Sparkfun Thermal Printer + FTDI Basic Board w/ C#

I'm trying to connect my laptop to a thermal printer from Sparkfun through an FTDI Basic board using C#. I've been using a .net library from:…
fionntom
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Can I cut off the 5v output of the IOIO to the Android?

I'm working on a project using Sparkfun's IOIO for Android (https://www.sparkfun.com/products/10748) where power consumption is a concern. The IOIO board provides the phone with 500 mA charging if I'm correct, which is too much for continuous…
Ahmed Farid
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