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Teensy is a cheap and powerful development board with some Arduino compatibility.

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I'm trying to connect a HiLetgo PCM5102 I2S DAC to a Teensy 4.0, but I'm not getting any audio out. I have it wired as: SCK - GND BCK - BCLK1 (21) DIN - OUT1A (7) LCK - LRCLK1 (20) GND - GND VIN - +3....
Jeff Kaufman's user avatar
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I am using an ISR, which is written to be as minimal as possible: volatile bool interrupt1{}; void ISR1() { interrupt1 = true; } The interrupt is handled by polling the interrupt1 variable in ...
Erik's user avatar
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I am looking at refactoring my code by implementing callback functions in order to be able to reuse the abstract logic of other functions/classes. However, I feel I need to learn more about the limits ...
Erik's user avatar
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Below is my current code for connecting to the A9G. As far as I can tell, it never actually opens a connection as HWSERIAL.println("AT"); does not return anything. Any ideas would be ...
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I have connected this Adafruit SD Breakout to a Teensy 3.2 over SPI. Because Teensy 3.2 is 3.3 V, I've connected the 3.3 V pin of the Teensy to the 3V pin of the SD breakout. See sketch below. I'm ...
daniel's user avatar
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I want to strobe 3 LEDs (at independent frequencies and duty cycles) via mosfets with a duty cycle of 0.05%-1% at a frequency range of 24-100 hz. I would like to hold 1% or better accuracy for both ...
Robb Godshaw's user avatar
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Please do forgive me if anything in this question does not make sense, I am very new to PCB and Arduino. I am following a tutorial through where the person doing it is making a small data computer (...
JeremyClarkson2's user avatar
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I'm using a Teensy 3.2 to read data from an ADXL375 using SPI. In general the communication is going just fine and I can activate settings etc. However, when I try to read X, Y or Z data it seems like ...
daniel's user avatar
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I received a set of wired Teensy 3.5 AudioShield and RFID RC-522. The audio shield is mounted on the Teensy but I cannot connect the MFRC522 Using MFR222 library. Pins are set to 0 and 31: #define ...
judthedude's user avatar
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I recently wired up the following ill-advised circuit: A common-anode display is wired with its cathodes connected directly to LEDs connected to ground. But the strange thing is that it worked ...
mwhea's user avatar
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I'm using a Teensy 3.5 to control a wall-following robot. The robot sends telemetry to my PC via two independent ports - Serial1 & Serial. Serial is the normal USB port, used when I direct-...
starship15's user avatar
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I have a datafile, datalog.txt I can open, read and write cool. What is the best way to delete all the file contents? Should I try rewriting the SD card file with NULL data? I have been reading the &...
j0h's user avatar
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I'm planning a new custom keyboard project which involves a solenoid being controlled by a Teensy2.0++, and i would like to power everything with just a USB cable. I don't have much electronics or ...
Coke2Code's user avatar
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I'm using a powerbank speced 5V at 2.4A to power my Teensy 3.6 via the USB port. However, Teensy recommends to not pull more than 250 mA from its 3.3V pin. Is there any way I can pull more current, at ...
Anna's user avatar
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I am using a Teensy 3.6 to communicate with an external instrument via a serial connection. However, I am not able to get the instrument to respond to my commands. The idea is to send a command from ...
baccandr's user avatar
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I recently got an MPU6050 and I noticed the accelerometer data was a bit off, especially on the Z axis. I'm running it on a Teensy 4.0 with Adafruit's MPU6050 library and basic example code: https://...
Koszuta's user avatar
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I converted an MP3 sound effect (5 seconds long) to WAV to play it out of a Teensy3.2 with speaker connected to PWM output pin. The TMRPCM library specifically talks about Arduino AVR boards, but ...
Bob Found's user avatar
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I have this sketch: const uint32_t len = 65536; uint8_t arr[len]; void setup() {} void loop() {} The length of the array should fit into the dynamic memory. However, when I compile the sketch it ...
LukasFun's user avatar
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I have ported a project from arduino Due to a teensy 4.1 In the project I read data from a sensor which speaks serial at 7 databits, no parity and 2 stopbits (no configurable). Now it seems that ...
Sven Onderbeke's user avatar
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I have a teensy 4.1, and I am trying to install NUTTX the Real Time Operating System ( RTOS ). Teensy is a supported platform. I am trying install nuttx compiled from source, and upload it using the ...
j0h's user avatar
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So I got 2x PSRAM chips from PJRC with my Teensy4.1 and soldered them on (it's a hideous job as I lost my tips) but it's all tested with a multimeter and the connections are solid. I ran the memtest ...
CSoft's user avatar
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I'm still getting myself acquainted with C++, so I expect this is a very basic issue I'm facing. I've got an OLED screen connected to a Teensy LC and can display text on it just fine. The Teensy ...
lowercasename's user avatar
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I'm using a Teensy to keep records on the location, speed, altitude, and direction of a weather balloon I'm hoping to launch. I have an Adafruit LSM9DS1 and a Ublox NEO-M8N with compass (HMC5833L) so ...
chiya's user avatar
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1 answer
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I want to monitor an input and then send the information in an encrypted way that can't be easily unlocked even if a malicious actor gets access to the device itself. I'm new to using the Teensy ...
joel_xay's user avatar
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It might be a bit out there, but for a project that I am working on, my word size default is 24bits (3x8-bit), of which the first 8-bits are data and the next 16-bits are data. I would like to ...
sandeepzgk's user avatar
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I need help converting my code to change out the delay() command into the millis() command for smoother operation. Currently the code only moves after the delay is up. I would like the codes to run ...
Noel's user avatar
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TEENSY Boards have in the USB-MODE "FLIGHTSIM" direct access to the variables = DATAREFS of X-PLANE 11. You can use FLIGHTSIMINTEGER and FLIGHTSIMFLOAT but not a varible for CHARs like the ...
bsram's user avatar
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Using a socket server on a Teensy 4.1, I am sending and receiving data in a loop from a Windows socket client (WinForms C#.NET). I am sending or receiving 530 bytes of data. In each direction, it ...
Joe's user avatar
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1 answer
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I am attempting to play a wav file from an SD card using a Teensy 3.5. I am using this buzzer and I have the following code currently: #include <Audio.h> #include <Wire.h> #include <SPI....
STF_ZBR's user avatar
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I am using FastLED to drive 16 pixels on an addressable WS2812B RGB LED strip. My application has extremely tight timing constraints. Specifically, I need to turn the LEDs on and off within less than ...
Johann's user avatar
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717 views

I am using BMP 280 for an altimeter to measure the altitude. Once all connected and uploaded the BMP280test code from Adafruit, the serial monitor says busy. But still, when I switch the port in tools,...
Dionn's user avatar
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I am using teensy 2.0 as DAC. I am trying to write signals on rudder and throttle of the ship via relay. How can I write these analog signals? Should I specify voltage for every pin? Here is my code: ...
Fourier's user avatar
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I am using the Teensy 2.0 with USBMidi in a project that allows musicians to use retro computers as "instruments" (https://github.com/fredlcore/midijoy). So far, all these computers had no more than ...
fredlcore's user avatar
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1 answer
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Arduino Leonardo as keyboard in the computer works! But not with the Xbox360. The Teensy works perfectly on the PC but how to emulate a keyboard device for the Xbox360. I know the Xbox360 has ...
eolandro's user avatar
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Can someone please help me write code that can read a 24-bit BMP file from an SD card, save converted to 8-bit BMP internally, and display the 8-bit BMP pixel values on Arduino terminal as a 2D matrix....
Li Lo's user avatar
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I have the following code in a Arduino Mega function to retrieve two 4-byte integers from a Teensy 3.2. Wire.requestFrom(SLAVE_ADDR, sizeof(float)+ 2*sizeof(long)); mySerial.printf("\n<<<<...
starship15's user avatar
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I would like to send CC messages to different MIDI Channel (volume control). The CC messages are coming from one knob. The solution I found kind of works but I'm pretty sure it is not ideal and seems ...
coolquentin's user avatar
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1 answer
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I have the battery charger product https://www.adafruit.com/product/2124 and a teensy 4.0, that I would like to use to power it. what, if any pin would I connect from bat, to the teensy? Its my ...
j0h's user avatar
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3 votes
3 answers
1k views

Coming from JS, I find it very difficult to program Arduino in C++ (not even knowing which version or what features are supported), being bound to the loop and delay, not being able to (easily) use ...
Qwerty's user avatar
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1 answer
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I've seen people use code like PORTB |= 0x1 << 6 to set the sixth bit of PORTB in arduino. I understand that this is significantly faster than using digitalWrite. How can this be done using a ...
Jachdich's user avatar
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1 vote
2 answers
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I have a teensy 4.0 which runs at 600MHz, and is double superscaler (i.e. can execute two instructions per clock cycle, sometimes). I need an interrupt to happen faster than every microsecond. I've ...
Jachdich's user avatar
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I am trying to program a Teensy 3.2 to act as a lightsaber controller. My code works perfectly but I can't select a port. How should I fix this problem? Here is my code: /* Presented without ...
John Going's user avatar
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1 answer
291 views

I have been working on a problem for a couple of days that I can't figure out. I am using a Teensy3.6 with Arduino IDE to build a CAN Bus monitor for a car. For those familiar, I am trying to save ...
Sam H.'s user avatar
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1 vote
2 answers
2k views

You initialize the serial communication via USB with Serial.begin(baudrate); where baudrate is a long specifying the number of symbols you want to send over the connection per second. You can put ...
LukasFun's user avatar
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1 vote
1 answer
806 views

I have a basic circuit, where I'm reading analog values from 14 infrared receivers. I set the bit resolution to 16 but specific ports are returning 10 bit values (from 0 - 1024) instead of 16 bit ...
Ietpt123's user avatar
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I have a small project to test a Sparkfun MPU9250 breakout board. 'Class_MPU9250BasicAHRS_t3.h', 'MPU9250BasicAHRS_t3.h' and 'Class_MPU9250BasicAHRS_t3.cpp' are all in the local project folder. ...
starship15's user avatar
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I am running a simple blink/hello world program on Teensy 3.2. The code is compiling and running fine but I can't see the serial output. When I try to open the serial monitor it gives me "Board at /...
Hubert B's user avatar
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I want to send some analog sensor data from a Teensy 3.2 to a mac running a python script (I am using the usual pyserial module and I send data using Serial.print() in the arduino sketch). I am using ...
L_T's user avatar
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1 answer
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I am trying to parse a simple string, print the result of the parsing via serial.println, and trigger a function on the basis of the received command. I wrote the code below, which perfectly works in ...
L_T's user avatar
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So, I have a very basic project where I cycle through 8 IR individual transmitters. After setting the individual transmitter high, I cycle through all 8 IR receivers and print their values, RX_CYCLES ...
dandev's user avatar
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