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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58 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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21 views

Check if the fingerprint exists and enroll with it? Adafruit_Fingerprint.h

I need to verify a fingerprint before being registered, but I have to put the finger 3 times on the finger sensor, which I prefer to do it just twice. The verification is ok, but I don't understand ...
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1answer
50 views

When I verify the sketch I get several errors

I am extremely new to Arduino coding and have downloaded a sketch for the PCA9685 to use with model railroading and turnout control. When I verify the sketch I get several errors ... I don't even ...
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1answer
85 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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77 views

ESP8266 WiFi.begin() isn't working

I did a project for IoT attendance system using ESP8266 and RDM6300. However, I can connect to wifi using WiFiMulti.addAP() function for my home WiFi. I tried WiFi.begin() instead of WiFiMulti.addAP(...
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20 views

Adafruit MQTT Library Error Connection failed

Adafruit_MQTT library is awesome but i have got a problem with it. I use it in Arduino with NodeMCU (ESP8266). Everything is okey with example code. (TLS connection - WiFiClientSecure). With my way ...
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1answer
69 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
83 views

5 minute timer output time remaining

I am trying to create a timer that outputs the time remaining in minutes. I am using an Adafruit Circuit Playground Express. For example, if the timer is 5 minutes, then every minute it should output ...
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1answer
42 views

Arduino is running as a server, but want to occasionally act as a client to update time

My Arduino (actually an ESP32-based Adafruit HUZZAH32) is running as a wifi server. Its main job is to service GET requests from a user, and to periodically turn devices on and off based on the ...
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1answer
51 views

Using software Serial for Adafruit Thermal library and more general cpp question

I'm working on a proof of concept for using the Adafruit_Thermal printer library with an ATTiny85. The ATTiny85 does not come with hardware serial capability, so I started looking into using ...
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1answer
92 views

ESP32 Pins won't fit in solderless breadboard

I bought an Adafrut Huzzah32 ESP32 for an IoT project. When the ESP32 arrived, I attempted to fit it into my existing breadboard, but I immediately noticed that no matter how hard I pushed, the pins ...
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30 views

Adding bootloader to Feather M0 Bluefruit LE

I want to make a custom Feather M0 Bluefruit LE. I know this means that I will have to add a bootloader to the ATSAMD21G18. I have seen that there are many useful articles in relation to adding ...
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2answers
74 views

Is My Motor Shield Broken?

So I am trying to work on a mini battle bot project. However, it has been a while since I have worked with my Arduino electronics. So I am going through and learning how to do each thing before ...
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28 views

Adafruit Feather M0 Basic Proto doesn't show up

I bought a Feather M0 basic from Amazon here. I installed all the board definitions and stuff from here I restarted the IDE and when I plugged it in, the Feather doesn't show up in ports or device ...
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3answers
106 views

DC motors only run in one direction

I'm quite new to Arduino and am making my first proper project, an obstacle avoiding robot. I'm using an Arduino Uno and a motor shield compatible with the Adafruit motor driver library. I'm trying ...
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1answer
90 views

Logging data to SD card from software serial

I have an Arduino Uno and an Adafruit data logging shield and I have connected a digital pressure sensor that uses serial communication. The sensor requires a character to start transmitting data. I ...
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1answer
56 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
45 views

Pin headers too long for the sensor i bought

https://www.amazon.co.uk/Adafruit-TCS34725-Color-Sensor-Filter/dp/B00OKCRU5M/ref=sr_1_3?keywords=adafruit+rgb+sensor&qid=1559653098&s=computers&sr=1-3 Just bought this colour sensor for a ...
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1answer
74 views

Adafruit Circuit Playground Express interrupt not working

I have interrupts attached to pins 4 and 5 which correspond to the left and right inbuilt buttons on the circuit playground express (https://learn.adafruit.com/adafruit-circuit-playground-express/...
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1answer
82 views

Red LED not turning off on Adafruit Circuit Playground Classic

When using the traditional Blink example program, the light blinks as expected. Even when writing from scratch digitalWriteing pin 13 to high and low repeatedly works fine. The problem is when I try ...
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1answer
55 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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30 views

Modifying NMEA of Adafruit GPS

I use a Adafruit Ultimate GPS Breakout - 66 channel w/10 Hz updates to collect data on animal movement. I have two questions regarding the produced NMEA: - there are some information about PGACK, ...
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1answer
51 views

HUZZAH ESP-8266 (by ADAFRUIT): How to use with the ARDUINO R3

I have recently purchased a ESP-8266 HUZZAH by adafruit. I'm kind of new to the whole arduino concept. I would like to know how I would be able to utilise this breakout board with my Arduino to do ...
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1answer
153 views

Using 18650 batteries with a 3.7v to 5v boost converter [closed]

I'm looking to set up a 1-meter strip of WS2812B LEDs (60 LEDs) with an off-the-shelf RF LED controller with a remote. The LEDs want a 5V supply - I've tried running them off 3.7v but the colour ...
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4answers
117 views

How can I hook up multiple MMA8451 accelerometers, (I2C protocol) using one Arduino Mega?

How can I hook up four (adafruit) MMA8451 accelerometers (using I2C protocol) using one Arduino Mega? What I'm confused about is I only have one SDA and SCL on the Arduino Mega obviously. So how can I ...
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1answer
73 views

Adafruit Feather 32u4 BLE compatible with Software SPI?

Let me preface by saying that I am not super experienced with electronics. I have an Adafruit Feather 32u4 that is using Hardware SPI to communicate over Bluetooth. Unfortunately, I'm also hoping to ...
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0answers
78 views

Code stuck on mag.getEvent(&event); in HMC5833L Compass

Last week I created some code in which I can run a Ublox GPS NEO-6 and a magnetometer HMC5883L together. Which at the time worked brilliantly. Yesterday I have attempted to run the code again, with ...
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1answer
274 views

Adafruit esp32 Feather Failing to compile

So yesterday, I was able to upload/compile given example code to the Esp32 Huzzah board. Today I couldn't even compile. Even carefully using the tutorial adafruit provides. I was getting errors as ...
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2answers
59 views

Can the 'Adafruit Non-Latching Mini Relay FeatherWing' be used with an Arduino microcontroller such as an Arduino Mega 2560?

Can this relay found here: https://www.adafruit.com/product/2895 Be used with an Arduino Mega? The description given seems to specify that you should hook it up to their dedicated 'Featherwing Board'...
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1answer
59 views

Adafruit RGB LCD w/ Shield kit connection to arduino uno? [duplicate]

I have a adafruit rbg 16x2 lcd with shield kit and am trying to connect it to an arduino uno. The only thing is the assembly instructions have the lcd basically using every pin on the arduino, even ...
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1answer
62 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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218 views

Bluetooth gamepad via Adafruit Feather M0 Bluefruit BLE

I'm trying to build a Bluetooth-enabled gamepad out of an old Playstation 1 controller, using an Adafruit Feather M0 Bluefruit BLE. I've programmed the board as a Keyboard HID and everything works: ...
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164 views

Reading Multiple RFID tags / Reading and ignoring/holding the tag

I'm currently doing a project where ideally I will have multiple objects with RFID tags on them that are placed on top of a Adafruit PN532 RFID Shield connected to a Arduino Uno Wifi Rev 2. The idea ...
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0answers
141 views

Adafruit Feather ESP32 - GPIO power drain during deep sleep

I have an Adafruit Feather ESP32 whose GPIOs I use to control an external device. I don't want the device to drain the power of the ESP32 sometimes, so I set the GPIOs to INPUT. When I go into deep ...
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135 views

Arduino OLED Display strange output

I am trying to use the Adafruit SSD1306 lib with my OLED display for arduino but I've encountered an strange error. I am using the default example "ssd1306_128x64_spi" but the display is odd, the ...
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1answer
247 views

How to get the weather kit with anemometer working using arduino (UNO)?

I tried to build a weather station with anemometer and My setup is, SwitchDoc Labs' anemometer kit (which is equivalent to sparkfun anemometer kit) connected to the grove weather-pi board with rtc ...
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0answers
68 views

Adafruit Feather nRF52832 as a SPI slave

Like the title says, I am trying to configure the Adafruit Feather nRF52 as a SPI slave, who will receive information from a MSP430 microcontroller. I have found a few code examples that provide ...
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187 views

WaveShare EPaper Display and Adafruit HUZZAH32 ESP32 Feather Board

I'm trying to understand how I could use WaveShare EPaper Display with Adafruit HUZZAH32 ESP32 Feather Board. With these connections SDI/SCK -> MOSI SCK/SCLK -> SCK CS -> 15 DC -> 33 RST/...
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1answer
108 views

Same output on displays with different I2C-addresses (AdaFruit library, ESP32)

I've got two displays hooked up to a ESP32 via I2C and I'm using the AdaFruit library. All handling display output is packed in a own library. As I was testing I only had one display set up and ...
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2answers
96 views

Is my board broken by soldering?

I've soldered a featherwing on my feather, then unsoldered it because it had stopped working: after the soldering of the featherwing, I was unable to upload new software to the board. But now that ...
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1answer
157 views

Trying to power multiple servos at once using a Arduino Mega

Recently I have been trying to do a project for my end of year project, it involved making a humanoid arm. I am still a newbie at these things, I usually have my friend do the wiring, but since he ...
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1answer
64 views

How to drive N channel gate correctly from Adafruit Feather pinout?

I am learning how to create a soft latch power switch, using an N channel mosfet. Currently, I have this: simulate this circuit – Schematic created using CircuitLab The idea is (so far) that ...
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1answer
228 views

Can I control 4 DC Brushless motors with arduino uno and Adafruit motor shield? [duplicate]

I need to control 4 DC brushless motors. I have no experience with arduino or coding. After some research the cleanest setup seems to be using the Adafruit motor shield, however the motors I'm using ...
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1answer
3k 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
63 views

noisy output lines when waking up from a sleep

Using code similar to these examples from AVR https://www.microchip.com/webdoc/AVRLibcReferenceManual/group__avr__sleep.html my program causes my Adafruit Feather 32u4 to often sleep. When the ...
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1answer
82 views

Cannot get pins on esp 8266 adafruit wifi module to read HIGH on pin 15

I have an esp8266 and I cannot get the value to read HIGH when 3.3v is applied to directly to pin by hand. I have an Arduino Uno powering the esp8266. It connects to the WiFi like it should, and now ...
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0answers
28 views

Capturing SBAS GPS packets

I have an Adafruit Ultimate GPS using a PA6H module (datasheet) with PTMK command packets (command set sheet). I have it connected to my PC via Arduino and want to be able to read the SBAS data (...
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2answers
565 views

Arduino NANO hardware SPI not working

I have an Arduino NANO clone and a 2.4" ILI9341 TFT display. The VCC and LCD pins of the display are connected to the 5V pin of the board. The GND to the GND. All the logic pins are connected to ...
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0answers
477 views

Adafruit Feather M0 Basic update bootloader

I bought a Feather M0 Basic from a reseller Lawicel however I'm missing the UF2 boot feature. When I press the reset button two times I just get a serial and have to program circuitpython using Bossa....
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1answer
230 views

Why does my 16x2 LCD displays weird letters and can't insert key from keypad?

I'm a newbie on Arduino here, and this is my first project on 16x2 LCD, 4x4 keypad and others. So, the story is, after I uploaded the program for my group's Arduino alarm clock to the Arduino board, ...