DevHeads IoT Integration Server
The DevHeads IoT Integration Server accelerates technology engineering by helping pro devs learn, share and collaborate.
JoinDevHeads IoT Integration Server
The DevHeads IoT Integration Server accelerates technology engineering by helping pro devs learn, share and collaborate.
Joinseeking-collabs
firmware-and-baremetal
middleware-and-os
edge-networking
pcb-and-analog
jobs
iot-cloud
code-review
devheads-feed
general-dev-chat
How to control a 5V output pin on STM32 Nucleo L4R5ZI remotely through a connected PC?
What is the purpose of HAL_ADC_PollForConversion in STM32 HAL ADC code?
HAL_ADC_PollForConversion
function. It seems to have no effect on the ADC readings in my code. Here’s an example:
The 1st (with PollForConversion
):
```c...What is the best ESP32 board and audio playback solution for a smart clock with NTP synchronization?
GUI interface for my project with Beaglebone Industrial
How to fix "Failed to initialize SD card -ENODEV" error on AVR128DA48 using SPI?
Failed to initialize SD card -ENODEV
error. how can I overcome this and log the pressure data?
this is my instruction snippet:
```
#include <zephyr.h>
#include <device.h>...Why does my NMI handler address end with a 0, but the vector address ends with a 1?
NMI_Handler
, and when I inspect its address in the debugger, I see that it ends with a 0. However, the vector address for the NMI handler contains the same address, but the last bit is set to 1. I understand that this might be related to the ARM Cortex-M4’s support for Thumb instructions (which are 16-bit), but I'm having trouble understanding why the last bit is set to 1.
...Why isn't my LED responding to pressure readings in AVR128DA48 project?
How to resolve board restarting issue on LilyGO TTGO LoRa32 (T3 V1.6.1)?
![attachment 0](https://cdn.answeroverflow.com/1275170854950539375/file0.jpg)
Which MicroPython libraries should I use for ECG with ESP32?
How can I resolve I2C transfer failure on AVR128DA48 with BMP280 sensor in Zephyr OS?
I2C transfer failed with error code -EIO
making it unable to establish successful I2C communication with the BMP280 sensor. who has an idea of how I can reslove it?
this is my code:
```#include <zephyr.h>
#include <device.h>...#define I2C_DEV DT_LABEL(DT_NODELABEL(i2c0))
Segmentation Fault in C Function Printing Double from Assembly Code
segmentation fault
while calling a C
function from assembly code to print floating point values. The C
function employs a switch statement to handle different data types, including doubles.
Been able to confirm that the issue lies within the printf
function when handling double values
, as converting the double
to an integer
before printing works correctly. But directly printing the double
using %f
results in a segmentation fault.
I'm running this on a 64 bit system (Ubuntu 22.04) and the GCC compiler.
Any insights into resolving this issue ?...![attachment 0](https://cdn.answeroverflow.com/1273763824700493864/file0.jpg)
Automatically Start Obstacle Detection System on BeagleBone Black at Boot
obstacle_detection.service
) in /etc/systemd/system/
2. Enable the service: sudo systemctl enable obstacle_detection.service
3. Start the service: sudo systemctl start obstacle_detection.service
...LCD Screen Remains Blank on BeagleBone Black with HC-SR04 Ultrasonic Sensor
HC-SR04
ultrasonic sensor to measure distances and displays the measurements on a 16x2
LCD
screen. am encoutering a situation where the LCD
screen remains blank and does not display any readings, and i have verified the lcd is powered correctly, i have also checked lcd initialization
python
lcd = CharLCD(pin_rs=LCD_RS, pin_e=LCD_E, pins_data=[LCD_D4, LCD_D5, LCD_D6, LCD_D7], numbering_mode=GPIO.BOARD)
python
lcd = CharLCD(pin_rs=LCD_RS, pin_e=LCD_E, pins_data=[LCD_D4, LCD_D5, LCD_D6, LCD_D7], numbering_mode=GPIO.BOARD)
Configuring USB CDC Rx Interrupt for STM32-F446RE (Nucleo)
int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
in a loop to receive incoming data. However, due to the transmission of substantial amounts of data, an interrupt-based reception technique is necessary. Any assistance or advice would be highly appreciated.How to Display Warnings on OLED Based on Object Distance Using BeagleBone Black?
BeagleBone Black
running Embedded Linux, VL53L0X
time of flight distance sensor to detect the distance to nearby objects and a 0.96-inch OLED
display to show the distance and warning messages. how can I display warning messages on the OLED
screen when the detected object is too close or too far. i am getting the error
Error: Display not updating
i have verified timing of the time.sleep()
function, ensured proper buffer clearing with disp.clear()
but still getting same error.
here's my code...issue
with the display not updating is due to how the text is being rendered on the OLED
screen, you could try making sure that each frame
is being drawn correctly before it’s sent
to the display
. The Adafruit_SSD1306
library has some quirks
with the text()
method, and sometimes it doesn't update the display as expected. So try modifying your code to use the Image and ImageDraw modules to draw the text on...How can I use Assisted GPS for faster first-time fix in my GPS tracking system?
I need a circuit to download the firmware inside esp32 and the pin used.
ESP32
using an FTDI
module, connect the FTDI's
DTR
to the ESP32's
EN (Enable)
pin, and RTS
to GPIO0 (BOOT)
, each through a 0.1 µF
capacitor. This setup allows the flashing tool to automatically reset the ESP32
and enter flash mode without any manual button presses.Which ESP32 board is best for a home automation hub with predictive maintenance and fault detection?
ESP32-WROOM-32
or ESP32-WROVER
would work well for your project. If you need extra memory for handling multiple tasks and MQTT
communication, the WROVER
is ideal with its additional PSRAM
. Keep an eye on memory, Wi-Fi
connectivity, and processing power to ensure your system runs smoothly. The WROVER’s
extra memory offers more flexibility if your project grows.Why isn't my ADC with DMA setup updating the variable correctly on the STM32F407ZGT6?
sensor_val
isn't being updated as I would desire.
I'm making use of the DMA2_Stream0 with Channel 0 for ADC1, and my ADC1 is configured to read from PB1 (channel 9) and PA1 (channel 1). I followed a tutorial closely but avoided triggering the ADC with a timer for now. I've also referenced an example related to this issue. However, my ADC callback isn't being invoked. Based on my understanding, the expected sequence should be:
ADC1->SR EOC --> ADC->CR1 EOCIE --> DMA2_Stream0_IRQHandler() --> dma_ADC_callback()...sensor_val
. Check that the DMA callback is linked to the interrupt handler and that interrupt's are enabled. If you're not using a timer, make sure the ADC starts conversions automatically. Finally, use debugging tools to confirm that the callback is triggering and data is being transferred as expected.Continuous Distance Measurement and OLED Update on BeagleBone Black with VL53L0X
BeagleBone Black
running Embedded Linux, VL53L0X
time of flight distance sensor to detect the distance to nearby objects and a 0.96-inch OLED
display to show the distance and warning messages. how do I continuously measure the distance using the VL53L0X
sensor and update the OLED
display with the readings?
I have added debug prints, checked for memory issues, ensured proper handling of the OLED
display but am getting the error prompt Error: ValueError: I/O operation on closed file
here's my code
```python...ValueError: I/O operation on closed file
error seems to points to an issue with how the OLED
display or I2C
bus is being managed. Make sure the OLED
is properly initialized and stays active. You might also want to wrap your loop
in a try-except
block to catch errors
and prevent the display from closing unexpectedly. re-check your wiring as well. Here's a quick fix:
```python
try:
while True:...