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Questions tagged [sparkfun]

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0
votes
1answer
43 views

Particle Argon controlling 12V, using 3.7V LiPo

I am trying to control a 12V DC motor using a Particle Argon, powered by a 3.7V LiPo. To get 12V I am using this step up regulator, and to control the motor I am using this DC motor controller. I am ...
3
votes
1answer
158 views

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 ...
2
votes
3answers
523 views

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 ...
-1
votes
1answer
78 views

MPPT Sunny Buddy (LT3652) + Solar Panel Voltage [closed]

I am having an issue using the sunny buddy mppt charger - The PV panels I am using give a voltage of 11-12V but when I connect the battery to the mppt, the voltage drops to 4-5V. Does anyone know ...
0
votes
1answer
103 views

PIC18F4550 and Sparkfun RFID Starter Kit with ID-12LA RFID Module, TAG Reading Problem

Recently I bought a SparkFun RFID Starter Kit with ID-12LA RFID Module. Similar to the one in the following Link: https://learn.sparkfun.com/tutorials/sparkfun-rfid-starter-kit-hookup-guide. I tried ...
0
votes
1answer
59 views

Why do SparkFun make breakouts for circuit multiplexers? [closed]

I found this product on SparkFun. My first thought was "why do they need to make breakout boards for multiplexers, aren't there ready-to-roll muxes that do this kind of thing that already come in a ...
0
votes
2answers
572 views

Capacitor use in H-Bridge circuit

I am trying to understand how an H-Bridge circuit works. The following is the diagram, from SparkFun's TB6612FNG product: Specifically, what purpose do the C1, C2 and C3 capacitors serve? If they ...
1
vote
1answer
117 views

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 ...
0
votes
3answers
125 views

do I need to have a common 3.3V line connection for the I2C communication to function properly between dev boards

I'd like to connect two Sparkfun ESP32 dev boards (a 3.3V device) through I2C where one would act as a master and the other as a slave. Each board gets its own LIPO battery, however it is only the ...
0
votes
2answers
637 views

Can I read out this 10V load cell with the 5V OpenScale board?

For a robotics project in which I want to build a kite flying robot I want to measure the pull force on the rope connected to the kite. To measure this pull force I bought this load cell (which ...
0
votes
1answer
40 views

Replacement for the INMP401 Microphone [closed]

Sparkfun sell a module with the INMP401 module on (Datasheet), it has a small amplifier circuit and I have been using it in a project. I am creating my own PCB for this and I've just noticed that the ...
0
votes
1answer
188 views

ad8232 needs a proteccion circuit? Can this obtain valid diagnoses? [closed]

I´m working with the Sparkfun kit based on AD8232 for acquiring the ECG signal and using arduino nano for data acquisition I read that there may be an accident in which the alternating current passes ...
0
votes
1answer
42 views

Can I use a separate power supply to charge the phone while working with a IOIO board?

The current I get from the IOIO to charge the phone (500mA) is too low for my application (I need it to run for a long time, and the battery drains). I was thinking of taking apart the cable (the red ...
0
votes
3answers
308 views

UV intensity behaving oddly with ML8511 UV Sensor

I am using the ML8511 UV sensor: https://learn.sparkfun.com/tutorials/ml ... -guide/all The sensor outputs a number that represents UV irradiance (intensity) in mW/(cm squared). However, whenever I ...
0
votes
1answer
64 views

Device-to-device/machine-to-machine wifi IoT system — pushing message/action to a connected device

I am not sure if this is the best community for this question, but I couldn't find one dedicated to IoT. Or should I ask on StackOverflow? I am looking to build the following IoT system using WiFi ...
5
votes
1answer
385 views

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 ...
0
votes
1answer
2k views

2 Lead ECG without RLD AD8232

I have got the SparkFun kit with the AD8232. The schematic is: I wish to use only 2 leads; how do I ground the third lead RLD? I'm collecting the signal from the hands. The datasheet only gives ...
0
votes
1answer
338 views

Inconsistent readings using Pressure / Altitude sensor (MPL3115A2)

I have two pressure sensors (MPL3115A2) with each connected to a Particle Photon, the sensors are placed next to each other at the same level. In barometric mode, one sensor reads 95043 Pa, while the ...
2
votes
3answers
744 views

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 ...
0
votes
1answer
883 views

Sending data over network via MicroController (Sparkfun Thing // ESP8266)

I'm getting frustrated and keep hitting a wall. My basic setup is I have an Apache server running on my Raspberry Pi and I am looking to send sensor data over the wireless network both are connected ...
0
votes
1answer
68 views

Power supply of a project

i'm thinking of making a project similar to the one you'll see in the picture lower: i want to control a remote control of a Velux with a Raspberry PI based on some data of temperature, rain, wind and ...
0
votes
1answer
169 views

Can FTDI Basic Breakout and FTDI XBee Explorer USB be used alternatively?

I wonder if these two boards from sparkfun can be used alternatively for USB to Serial communication? The first: (FTDI Basic Breakout) https://www.sparkfun.com/products/9716 The second: (FTDI XBee ...
4
votes
3answers
14k views

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, ...
0
votes
2answers
186 views

Peak-to-peak voltage of WRL-10534?

I'm experimenting with the 434 MHz RF Link transmitter (WRL-10534) from SparkFun. I'd like to determine the peak-to-peak voltage of the RF output, but I don't have access to an oscilloscope that can ...
4
votes
1answer
25k views

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 ...
0
votes
1answer
371 views

2 sources one speaker - for old rotary phone

I have built a "mobile" phone using an old GPO 746, a Raspberry Pi and an old Nokia 6301, amazingly I have managed to get the audio to/from the phone's 2.5mm jack plug to through the GPO handset, ...
2
votes
1answer
180 views

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 ...
1
vote
2answers
136 views

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 ...
0
votes
1answer
813 views

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: http://electronicfields.wordpress.com/2011/09/29/thermal-...
1
vote
1answer
580 views

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 ...
0
votes
0answers
328 views

Reading from an ITG-3200 Gyroscope

I'm having some trouble getting any reading from an I2C ITG-3200 Gyroscope breakout I'm using from Sparkfun. Here is the product: https://www.sparkfun.com/products/9801 I have a feeling this might be ...
0
votes
1answer
209 views

Multiplex data and LED pin

I'm looking at performing a chip conversion for the Sparkfun LED RingCoder. The sample code provided with the product works well on an Arduino UNO, but it uses a pin for each I/O - 5 pins for the ...
0
votes
1answer
699 views

Increase the analog sample rate of the IOIO?

On the analogue input wiki page for the Sparkfun IOIO (android development board), it says that the analogue pins are sampled at 1kHz. This is too low for a number of potentially exciting uses, like ...
2
votes
2answers
2k views

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 ...
2
votes
1answer
4k views

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 ...
2
votes
1answer
188 views

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 ...
1
vote
1answer
284 views

Wireless UART Speed Shift

I'm building a MindFlex-based EEG. Basically, I'm sniffing a 9600bps bus, analyzing the data with an Arduino*, and sending it to Processing/Java for display. To make it absolutely isolated from mains ...
2
votes
2answers
368 views

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 ...