Skip to main content

Questions tagged [sparkfun]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
1 answer
27 views

What are the units of the channels of the SparkFun NIR Spectral Sensor?

The product is https://www.sparkfun.com/products/14351 and the datasheet can be found at https://cdn.sparkfun.com/assets/1/b/7/3/b/AS7263.pdf. I'm not entirely sure about the difference between the &...
soravoid's user avatar
1 vote
0 answers
68 views

Fall edge interrupt constantly triggering without any visible edge

I'm trying to implement a button-operated sleep mode toggle on a Sparkfun Artemis module. Button press one puts the Artemis to sleep, button press two wakes it up. I'm coding it in the Arduino IDE and ...
E.HP.S's user avatar
  • 349
0 votes
1 answer
43 views

Sparkfun Artemis Nano keeps dropping BLE connection and doesn't notice it isn't connected anymore

I'm working on a device that uses the Sparkfun Artemis (specifically the Nano at the moment) to count the number of times a wheel spins, using a UART based proximity sensor. The device is meant to ...
E.HP.S's user avatar
  • 349
0 votes
0 answers
33 views

How to resample spectral data into intensities of spectral bands for SparkFun spectral sensor?

My end goal is to create a machine learning model that can classify spectroscopic data from the SparkFun spectral sensor (https://www.sparkfun.com/products/14351). Unfortunately, it's infeasible for ...
soravoid's user avatar
0 votes
1 answer
306 views

Trouble communicating with ICM-20948 IMU over I2C

My setup: I'm trying to communicate with an ICM-20948 IMU over I2C with a Raspberry Pi Pico, and writing C++ with Visual Studio Code. I have started with the Sparkfun Arduino library for this chip, ...
Rocketmagnet's user avatar
  • 27.5k
0 votes
0 answers
54 views

SparkFun USB UART Breakout (CY7C65213) board burning

I have been using the SparkFun USB UART Breakout (CY7C65213) board for flashing firmware to boards. But it is always burning up the Microcontroller and ruining the boards after a about 30-40 writes. I ...
Sujith's user avatar
  • 9
0 votes
1 answer
89 views

Transfering MPU9250's DMP data over I2C (Can a device be an I2C slave and master simultaneously?)

I have an MPU9250 IMU sensor (namely this board: 9DOF Razor IMU M0) that I am using to measure orientation. I want to use the MPU's Digital Motion Processor (DMP) to compute the orientation based on ...
domiinio's user avatar
1 vote
1 answer
109 views

Read moisture measurements from SEN-17731

I am trying to read various measurements with a raspberry pi 4. I decided to use an i2c bus to keep the wiring clean and easy. For a soil moisture measurement I decided to go with the SEN-17731. ...
shoj's user avatar
  • 11
0 votes
2 answers
135 views

MOSFET and 5V regulator

I'm looking at the schematic for the Sparkfun Redboard and am wondering what is the function of this MOSFET. From what I understand the gate is held at ground and since it's a PFET, once the source ...
Ceiling's user avatar
  • 59
-2 votes
1 answer
73 views

Precharging my capacitor manually - looking for feedback [duplicate]

This is my plan, to pre-charge my capacitor of my electric vehicle manually, to prevent sparks occuring when connecting my heavy duty battery. The cables can easily handle 600A as well. Im asking here ...
Simon Smith's user avatar
-1 votes
1 answer
142 views

I2C voltage levels and inter-operability with Sparkfun Boards

I'm trying to design around Sparkfun's I2C products to work with Adafruit sensors, specifically Sparkfun's I2C Multiplexer, Differential Endpoint, and Differential Midpoint. From what it looks like, ...
BestQualityVacuum's user avatar
0 votes
1 answer
751 views

Multiple TCA9548A multiplexers are not working correctly with more than 3 connected

Currently I'm working on a project where I want to use multiple scales in a fridge. When something will be taking out of the fridge the scale detects the different weight and send an event to my ...
SDW's user avatar
  • 21
0 votes
1 answer
249 views

TFT display wiring on Sparkfun Pro Micro

Please help me configure the wiring for this TFT display. I’ve tried using the Waveshare TFT display with both the Sparkfun Pro Micro and the Raspberry Pico but had very little success. Only the ...
Lilguyuno's user avatar
1 vote
4 answers
745 views

The Differential I2C Bus Extender is only working for 1 channel

Edit: More information about this question can also be found here: https://forum.sparkfun.com/viewtopic.php?f=105&t=55786 Currently I'm working on a project where I want to use multiple scales in ...
SDW's user avatar
  • 21
1 vote
1 answer
447 views

Battery Considerations For RP2040 and NEO-M9N GPS Logger

I am a software engineer, but new to hardware hacking, so I apologize if this is missing any detail, I will try to be thorough and update with any requested information. I also tried to keep this as ...
TomM's user avatar
  • 45
1 vote
2 answers
206 views

RP2040 Board receiving weird output from SparkFun Ublox NEO-M9N GPS Unit

I am a software engineer, but new to hardware hacking, so I apologize if this is missing any detail, I will be thorough. I am working on a small tracking system as a personal project. I am using a ...
TomM's user avatar
  • 45
0 votes
1 answer
70 views

SparkFun Power Driver Shield Kit for controlling 60 V input [closed]

I just bought SparkFun Power Driver Shield Kit. I read in the specifications that it was possible to control up to 60 V using PWM. I have got a project where I need to control 60 V with the PWM so I ...
acroscene's user avatar
  • 179
0 votes
0 answers
304 views

24lc256 EEPROM page writing problem

I have a question about my EEPROM Project recently started. why there is a maximum of 16-byte is Writing into EEPROM in below code. when we able to writing 64byte into the single page using page write ...
WHITE's user avatar
  • 1
0 votes
3 answers
439 views

Controlling multiple solenoid valves like addressable LEDs

I am asked to implement a small indoor musical fountain which consist of around 45+ solenoid valves. Rather than having separate dedicated lines to the valves, I would like to implement something like ...
Sandeep Thomas's user avatar
1 vote
2 answers
572 views

What's this diode symbol?

I'm looking at the Sparkfun USB-C PD Board schematic and noticed this portion under ESD protection as seen below. It looks like two Zener diodes facing each other thus prevent current flow in either ...
Agriculex's user avatar
  • 495
0 votes
2 answers
848 views

Why does the MAX30102 only work on a finger?

I am using a MAX30102 sensor with Sparkfun library for heart rate monitoring. It does work for a finger, but when the sensor is mounted on chest I am not getting a reading. Why is that?
oppo's user avatar
  • 547
0 votes
1 answer
910 views

Connect to a serial output device with 12V power input with 5V USB-TO-UART

I have DG600F coin acceptor with 12V power input and serial port output CP2102 usb-uart bridge and FDTI TTL-232RG cabel as an alternative A PC and Macbook as alternative I need to connect DG600F to ...
goooseman's user avatar
0 votes
2 answers
2k views

ESP32 FCC Certification

I want to build an esp32 device using the esp32-pico-d4 chip that I will sell to hobbyists. However, I recently came across something called the FCC. It requires radio devices to get certified which ...
TimmyTech64's user avatar
1 vote
0 answers
101 views

How do I wire a Rasberry Pi 3B+ to a WS2812b RGB strip?

I am working on a project where I need to use a WS2812b RGB strip. I am really worried because I have already burnt 2 Raspberry Pis with my wiring. I just want to show my schematics, and be assured as ...
user avatar
0 votes
1 answer
217 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 ...
Greg's user avatar
  • 15
3 votes
1 answer
4k 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 ...
sanotronics's user avatar
3 votes
3 answers
4k 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 ...
Parrrot's user avatar
  • 31
-1 votes
1 answer
167 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 ...
India Cockroft's user avatar
0 votes
1 answer
183 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 ...
Khaldoun Kassam's user avatar
0 votes
1 answer
65 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 ...
Brendan's user avatar
  • 173
0 votes
2 answers
2k 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 ...
Sabuncu's user avatar
  • 405
2 votes
1 answer
521 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 ...
BestQualityVacuum's user avatar
0 votes
3 answers
481 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 ...
Constantino's user avatar
0 votes
2 answers
2k 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 ...
kramer65's user avatar
  • 485
0 votes
1 answer
69 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 ...
GPPK's user avatar
  • 131
0 votes
1 answer
61 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 ...
Muaddib's user avatar
  • 11
0 votes
3 answers
407 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 ...
Foobar's user avatar
  • 189
0 votes
1 answer
80 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 ...
O.K.'s user avatar
  • 357
5 votes
1 answer
989 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 ...
ohhorob's user avatar
  • 215
0 votes
2 answers
4k 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 ...
Richeek Dey's user avatar
0 votes
1 answer
455 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 ...
user18197's user avatar
  • 199
2 votes
3 answers
832 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 ...
user18197's user avatar
  • 199
0 votes
1 answer
1k 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 ...
Stampede's user avatar
0 votes
1 answer
79 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 ...
Gian Mauro Musso's user avatar
0 votes
1 answer
193 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 ...
Robotawi's user avatar
  • 101
4 votes
3 answers
20k 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, ...
Aaron Aguayo Martinez's user avatar
0 votes
2 answers
242 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 ...
Eddie Lawrence's user avatar
5 votes
1 answer
40k 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 ...
Nyxynyx's user avatar
  • 1,151
1 vote
1 answer
493 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, ...
user39631's user avatar
2 votes
1 answer
192 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 ...
MichelleJS's user avatar