Questions tagged [adafruit]

Adafruit Industries is an open-source hardware company founded by Limor Fried in 2005. Use this tag to mention issues with Adafruit products or tutorials.

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Serial Communication Problem Between - Arduino UNO and ESP8266 (ESP-01)

I have built a Small Project to illuminate a connected LED on the Arduino-Uno via the internet by ESP8266-01 using the adafruit website but the problem is getting a wrong result and not lighting the ...
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10 views

i am having Strange issues when trying to read form gps serial connection

I have an Adafruit Ultimate GPS connected to a MEGA2560. I am trying to get the data from the buffer and do other data processing at the same time, however. when i allow other processing to be done ...
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31 views

Reading DHT22 reboots arduino

I’ve got a quite weird behavior of DHT library. I’ve got DHT22 sensor. If it’s signal cable is not connected, reading the sensor causes a problem: Arduino reboots or hangs in unpredictable places. ...
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1answer
35 views

Neopixel code not working on Adafruit Feather board

I have connected a single neopixel to my Adafruit Feather board, running Arduino software. The power pin is connected to 3V on the Feather. The data-in pin is connected to pin 15 on the Feather. As ...
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1answer
2k views

Using MMA8451 accelerometer to count steps [duplicate]

I'm trying to use an Adafruit MMA8451 accelerometer to create a pedometer-type device that counts steps. I'd like to initiate a counter that says "if the x-axis readout is > some threshold, add 1 to ...
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1answer
70 views

Getting two trinkets to talk to each other via the serial pins

I'm trying to make a quick proof of concept of two trinket M0s talking to each other via their RX and TX pins and I'm not able to get it working. I uploaded sender and receiver sketches to two ...
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1answer
79 views

DHT Temperature sensors work with Uno but not Nano

I have been trying to write a program that uses the DHT11 temperature sensor and the BMP280 Air pressure sensor. The BMP280 works fine and outputs the air pressure, but the DHT11 does not work. On ...
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1answer
5k views

Did not find fingerprint sensor :( Arduino Mega 2560 Adafruit Fingerprint Sensor

I'm getting the following error when I try to enroll fingerprints using the Arduino Mega 2560 microcontroller along with a Fingerprint Scanner: Did not find fingerprint sensor :( The exact devices ...
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1answer
38 views

Is there an Adafruit function to invert the colors of my screen for Arduino language?

I am trying to invert the color of my OLED display screen once a button is pushed. I have the button situation figured out but I can not find a function that inverts the color. I am using these two ...
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2answers
607 views

Ooops, no LSM303 detected … Check your wiring!

History I have an Adafruit 10DOF IMU Breakout which has been working on my Mega for some time. This morning my program did not run so I starting troubleshooting. Scenario I eventually plugged the ...
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19 views

Using arduino uno and an adafruit shield to control 3 dc motors and a linear stepper motor

Hello I am currently doing a project at my university which requires me to order and program 4 motors using an arduino. I will be using an arduino uno and an adafruit motor shield. 2 of the dc motors ...
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2answers
133 views

Is an atmega 2560 board compatible with the Adafruit Trellis?

I want to build a custom midi controller for my computer, and yes, Adafruit has a mini Untz project. For my purposes, I need more analog inputs than the Leonardo, and the only other option I can find ...
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1answer
22 views

Issues with connecting to an Adafruit FLORA board

I just bought a new Adafruit Flora board, and I haven't been able to get it working successfully. When I plug it into a USB port, the board seems to be getting power (the green PWR LED is illuminated),...
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10 views

Reading a datasheet for power requirements - regulator vs positive supply [migrated]

I'm trying to interpret the attached datasheet to figure out how much power to give this sound board from adafruit: https://www.adafruit.com/product/2220 I was hoping that the sound board could ...
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22 views

Accessing Serpente R2 SPI Flash as FAT filesystem

CircuitPython has the ability to access the Serpente R2's SPI Flash chip as a FAT file system. I can't figure out how to configure the Adafruit SPIFlash library to work for this board. The file I have ...
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1answer
29 views

Adafruit Circuit Playground Express fails to upload

When uploading code to the Adafruit Circuit Playground Express, I have found that most of the time it fails to upload saying that the port is busy. There seems to be no logical reason behind this, as ...
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27 views

Custom Board with ATSAMD21E17 with adafruit bootloader - can't flash

i build a custom board with an ATSAMD21E17D, similar to adafruit's Trinket M0, but with more used pins and different pinmux. I sucessfully burned the adafruit UF2 bootloader for that board using ...
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2answers
795 views

Get accelerometer values from BNO055 using adafruit's Unified Sensor Library

If I understand correctly using the Adafruit_Sensor one can extract information from the sensor specific information. These sensors are currently mentioned in the README. I am using the BNO055 for two ...
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15 views

Bluetooth not discoverable using feather nRF52832

I just bought a feather nRF52 but I can't make the Bluetooth LE work ... I followed to tutorial (https://learn.adafruit.com/bluefruit-nr ... troduction) which features the same information that on the ...
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1answer
155 views

Blynk app, DotStar bluetooth control code help

This is my setup: Arduino Mega; HM-10 bluetooth module (bought off ebay, so not sure if genuine but works); Adafruit Dotstar addressable LED strip; iOS Blynk app; Hardware-wise, everything is ...
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1answer
151 views

How to add if condition in RFID example?

Using an Arduino Mega 2560 and PN532 NFC/RFID module, I want to be able to scan a card and see if its value is (0xF0, 0x21, 0x5D, 0xA7). It should print "accepted" in the serial monitor. However ...
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1answer
1k views

Increase sample rate in ESP32 board

For my final project on the university as a Systems Engineer, I'm working on a "electronic stethoscope", which is giving me a lot of headaches. I bought a Adafruit Feather ESP32 Huzzah (https://learn....
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1answer
99 views

Adadfruit Trinket software not running on ATtiny85

I have an application that uses a pair of nRF24L01+ as a simple RF link between a camera PC sync output and a set of LED flashes. The important factors are power and low latency - hence the 2.4GHz. I ...
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22 views

FlexiTimer giving errors in servo motion

I am working on a quadruped bot, spiderbot and I am trying to make a creep gait using Forward kinematics however, for some reason my code stops working after the execution of the line - [pwm.setPWM(...
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1answer
186 views

Adafruit Huzzah ESP8266 Battery Power issue

I'm trying to connect a ~5.5V (2 x 3V coin cells in series, but their voltage drops a little) to the VBat (or V+) of my Adafruit Huzzah ESP8266 module (not the black Feather one, the smaller blue one: ...
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1answer
172 views

How to control RC power switch with Arduino-/Adafruit-Board?

I want to control (switch on/off) a solenoid valve via an RC power switch and an Adafruit M0 Feather Bluefruit LE. The RC power switch is this one, and this is the Adafruit Board Pinout. My ...
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1answer
534 views

Problems connecting Adafruit Feather M0 to network

I'm trying to connect my Adafruit Feather M0 board to an existing WiFi network. Whenever I use the "ConnectWithWPA" example sketch, I receive "Attempting to connect to WPA SSID: "MyNetwork" " in the ...
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2answers
964 views

Error using Adafruit Feather M0

I am trying to upload an empty program on the Adafruit feather to see if it connects to my PC. So far, it isn't. I'm running a Windows 10 and I followed this guide: https://learn.adafruit.com/...
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0answers
59 views

Reducing the noise of an SSD1306 display by reducing pre-charge in Adafruit SSD1306 library

I have issues with electrical noise on my board (>300mV switching noise on top of 3.3V rail, its quite a lot), which is generated by my I2C SSD1306 OLED display. After some research I found that the ...
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1answer
97 views

Help with code for pushbutton connected to adafruit motorshield v2

can anybody assist me with a code? I am using arduino uno with adafruit v2 motor shield stacked on top. I am using a pushbutton and one DC motor and I want the state of the push button to change after ...
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2answers
62 views

Adafruit motorshield v2.3 not working

I want to connect my adafruit motor shield v2.3 to a touch board from bare conductive so that the motor turns when one of the electrodes is touched. I've tested the touch part and that isn't a ...
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0answers
48 views

Thermal Printer - Qrcode

I am trying to print QRcode (not bitmap) on my thermal printer with Arduino and ESP32. I am using the same QRcode library and Adafruit Thermal printer library of this post. How to scale a bitmap (...
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1answer
3k views

Motor shield power from Arduino pro mini 5v RAW Pin 150mAh cannot run servo

linked to my old question, Pro Mini 5v with Adafruit motor shield v1 power sharing problems I figured out and use one 7.2v battery (6 AA cells), and link it with RAW pin to Pro mini and join its 5v ...
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1answer
535 views

How to change speed of multiple servos acting at the same time with PCA9685 module?

I'm using the PCA9685 module with its Adafruit library. In my code I have one object of the servodriver class that has 14 channels (controlling 14 servos basically). void Positioning(){ ServoDriver....
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2answers
196 views

CC3000 gets wrong address when connecting to wireless AP

I tried using both the SparkFun and Adafruit CC3000 libraries first with what I actually wanted as a program, but when that didn't work, the examples for those libraries, and I always seem to get the ...
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1answer
2k views

Adafruit Huzzah espcomm_open failed

I recently bought an adafruit huzzah as well as a serial to usb cable to connect it to my computer running windows 10. I was able to get the board set up in arduino following the directions found here....
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3answers
9k views

Why is my Adafruit motor shield not spinning my motors?

I'm using the Adafruit Motor Shield v2.3. I'm powering the Arduino with a USB cable and I'm powering the motor shield with a 9 volt battery. I removed the vin pin, and I'm using this tutorial/code to ...
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1answer
221 views

How to scale a bitmap (uint8_t array) in Arduino?

So I have a project where I send text to an Arduino, which is then printed out as a QR code on a thermal printer that can take a bitmap image with a given width and height. Is there a way I can "...
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1answer
100 views

Adafruit Micro-SD breakout not initializing on MEGA 2560

] [I am having quite a bit of trouble trying to get my Arduino MEGA 2560 to read my micro-SD card. My wiring is as follows: Breakout Arduino 5v 5v Gnd Gnd CLK 52 DO ...
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1answer
478 views

Adafruit Feather 32u4 Bluefruit LE and HC-05 Bluetooth module

Is it possible to connect an Adafruit Feather 32u4 Bluefruit LE with an HC-05 Bluetooth module? I am making a heart rate monitor using an Adafruit Feather, but it is unable to send the data to ...
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1answer
236 views

Running Arduino code for Bluefruit LE on bare ATMega328

I need to hook up Bluefruit LE Breakout (nRF8001-based) to ATMega328 chip (to use it as wireless UART), and it seems like the library provided is for Arduino. What I have is just bare ATMega328 (note ...
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2answers
305 views

How to stop OLED flicker when using SSD1306Ascii.h?

Why does the OLED display flicker when using the SSD1306Ascii.h library? The Adafruit library does not have this issue, but I've been told uses a lot of memory and so I'm trying to use Ascii to ...
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3answers
7k views

What components I need for a small GPS tracker

I am new to Arduino and want to create a graduation project for my university. I am thinking to create a GPS tracker that can be attached to a cloth to track kids, for example. So the requirements for ...
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1answer
33 views

Need Help to Select Microcontroller ?? Help [closed]

i am doing a project which has to run in side a garage to control water levels in sump pit as well as in overhead tank . also schedule running of pumps. i have to run 5 pumps (two for ground water ...
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0answers
29 views

Finger print scanner using Arduino

Any help is greatly appreciated! Trying to build a small door lock that is controlled by a finger print sensor, (I know it will not be very practical). My issue is with putting the hardware together, ...
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1answer
28 views

How to connect 2 Fingerprint Sensor to Arduino Mega? Please help

My project was to open the door from inside and outside the room using fingerprint sensors, currently I used separate arduino on 2 different fingerprint sensor. Please help, my arduino detected only 1 ...
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0answers
72 views

Serial port selection and command receiving failure with Arduino Uno and Adafruit servo shield

For a long time I use Arduino Uno controller and Adafruit 16-Channel 12-bit PWM/Servo Shield with 6.3V 1000 uF capacitor, powered with 6V 8Amp adapter to control 6 High-Speed Digital Micro Servo DSM44 ...
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2answers
7k views

Exit status 1 expected primary-expression before ']' Arduino

Here's the whole error: Arduino: 1.6.7 (Windows 7), Board: "Arduino/Genuino Uno" *\readMifare\readMifare.ino: In function 'void loop()': readMifare:113: error: expected primary-expression before ...
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1answer
128 views

Relay board not working with nodemcu

This is the relay board I am using nodemcu to make a home automation project which is controlled by google assistant. This is the code i am using is this one #include <ESP8266WiFi.h> #include "...
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1answer
2k views

ESP8266 light sleep - can't wake up

I am attempting to implement a light sleep mode on an esp8266 (feather huzzah) which, when a button is pressed, wakes the system up so that it can continue its normal task. I cobbled together some ...

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