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DevHeads IoT Integration Server
The DevHeads IoT Integration Server accelerates technology engineering by helping pro devs learn, share and collaborate.
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DevHeads IoT Integration Server
The DevHeads IoT Integration Server accelerates technology engineering by helping pro devs learn, share and collaborate.
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Switching Between Two ESP-CAM Boards on a Single TFT Display via SPI
Hey guys i’m working on a project where I need to connect two ESP-CAM dev boards to a single TFT display via the SPI bus. My goal is to display the video feed from either camera on the TFT display, selectable via a button press. I'm aware that this can be achieved using ESP-NOW with three ESP32 boards (two cameras and one for the display), but I'm looking to maintain the high frame rate achievable through direct SPI bus connection. Is it possible to share the SPI bus between the two ESP-CAM boar...
Solution:
Yes @Daniel kalu , it's possible to share the
SPI bus between the two ESP-CAM boards, but you'll need to manage the SPI bus and the CS lines carefully. One approach is to use a multiplexer or an analog switch to select which camera is connected to the TFT display at a time. This allows you to keep both cameras connected but only one active on the bus, Another method is to manually control the CS line, ensuring only one ESP-CAM is communicating with the TFT at any given time....Do I need to enable long-range mode for both sender and receiver in ESP-NOW?
when using ESP-NOW If I want to enable long-range transmission I have to enable it for the receiver as well?
How can I resolve "ESP_ERR_ESPNOW_IF: Interface error" when using ESP-NOW with SoftAP on ESP32?
Hey guys I'm facing an issue with my ESP32 project, where the central controller acts as a soft Wi-Fi access point with a web server and communicates with three peripheral devices via ESP-NOW. Despite ensuring that the Wi-Fi and ESP-NOW channels are identical, I keep seeing the error "ESP_ERR_ESPNOW_IF: Interface error" when calling
esp_now_send().
This project extends my previous ESP32 home automation hub with predictive maintenance, where I used ESP32 boards for sensor data collection and OTA updates. Now, I'm trying to integrate ESP-NOW communication with the web server and SoftAP capabilities. I've tried switching to SoftAP mode, but the issue persists. How can I resolve this and ensure reliable communication between the devices?...Solution:
The error typically occurs immediately after calling
esp_now_send(), and it seems to be fairly consistent happening almost every time I attempt to send data. I haven't noticed any significant delay before the error appears. And so far, I haven't seen any other error codes or warnings,and I haven't checked the ESP-NOW buffer status with esp_now_buffer_count(), but that sounds like a good next step. I'll give that a try.Any examples of power management with ESP-NOW beyond modem sleep?
has anyone an example with power management when using ESP-NOW apart from modem sleep?
Solution:
issue with connecting classic bluetooth to android
hey there guys i dont know which is better for home automation system in esp32 . Can anyone tell me which is better for home automation system classic bluetooth or BLE ???
if anyone can help me please i want help from you kindly message me please...
Solution:
If your device is battery powered - then BLE definitely. The 'LE' is Low Energy and so your battery will last longer
seeking help for connectivity issues in esp32 bluetooth with android
I found this code for connecting the bluetooth
#include "BluetoothSerial.h"
BluetoothSerial SerialBT;
bool isConnected = false;...
Seeking help for home automation project on esp32
hey there guys, I am working on home automation with esp32 module with wifi and bluetooth. I have developed the model that will get the data from firebase in esp32 and control the home appliances such as lights and fans but I am new in this can anyone help me with this project i have this this problems as of now :
1. Once bluetooth and wifi is disconnected due to out of the range it will not connect when i am in the range automatically
2. how to give esp32 wifi userid and password through mobile of our home wifi.
3. I dont know how to implement this module for AC(Air conditioner).
...
Solution:
Hi @lucifer2615. following are some inputs
- I suggest considering the ESP WiFi Manager library which gives access to the web interface from the browser to set the wifi name and password. Apart from this, there are other Apps like ESP SoftAP Provisioning, etc.
- Controlling AC to turn ON/OFF can be done with a relay but to control core functionalities you can use IR transmitter connected to ESP32. So, your ESP can send control commands just like the ac remote instead of an actual physical remote. ...
Troubleshooting SPI Transmission Errors for Image Data on ESP32
still on Object Detection with
MicroPython and OV2640 Camera Module Using ESP-WROOM-32, how can i transmit the image over SPI i keep getting a persitent error
```
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "spi.py", line 42, in write...Solution:
Emm...try to lower the baudrate and sending the image data in smaller chunks maybe that would work
Ensuring Reliable Sensor Readings on AVR32UC with Zephyr OS in Varying Conditions
How can I ensure that my AVR32UC MC prototype running on zephyr OS operates reliably under different atmospheric conditions, particularly addressing the issue of inconsistent sensor readings? Despite thorough testing under controlled environments, the sensor readings become unreliable when exposed to varied conditions. What steps can I take to improve the accuracy and consistency of these readings, ensuring the prototype functions effectively in life applications?
Solution:
Regularly calibrate your sensors across the expected range of environmental conditions. This can compensate for sensor drift or inaccuracies caused by temperature or humidity changes.
Protect the sensors from direct exposure to extreme conditions by using appropriate enclosures or coatings. This minimizes the impact of sudden temperature or humidity fluctuations.
Conduct extensive testing in diverse real-world environments to identify specific conditions that affect sensor reliability, allowing you to fine-tune your compensation algorithms and error handling....
Configuring SPI Communication on ESP32 for Transmitting Images from OV2640 Camera Module
in continuation with my project Object Detection with
MicroPython and OV2640 Camera Module Using ESP-WROOM-32. How do i configure SPI communication on the ESP32 for transmitting images captured by the OV2640 camera?Solution:
@Enthernet Code for transmitting images captured by the
OV2640, you'll want to set up the camera to capture images in a format that can be efficiently transmitted over SPI. the OV2640 can output images in JPEG format, which is compressed and more manageable in size, after capturing an image, you can send it over SPI using something like this:
```python
def send_image(image_data):
cs.value(0) # Select the SPI device
spi.write(image_data) # Transmit the image data...How to Detect and Fix Memory Leaks in ESP32 FreeRTOS Home Automation Project?
Hi guys I'm working on an ESP32 home automation project using FreeRTOS and MQTT, but the system crashes after a few hours with the error message "Heap allocation failed". I suspect a memory leak in my
createTask function:
```c
void createTask(void *pvParameter) {
uint8_t *buffer = malloc(1024);...Solution:
hello @Daniel kalu The issue is that the buffer you allocate with
malloc(1024) remains in memory even after the task is deleted with vTaskDelete(NULL). Since you’re not freeing the buffer using free(buffer), this memory isn’t returned to the heap, leading to the Heap Allocation Failed error after several iterations.Is it feasible to run MobileNetV2 for image recognition on an ESP32 with a 320x240 camera feed?
Hello,I have a question about the feasibility of running an image recognition model on an ESP32 to recognize a single specific object, such as a person, using a camera with a live video feed. The images the model will process are 320x240 pixels in resolution. I'm considering using a lightweight model like MobileNetV2. Additionally, I'm curious about whether the ESP32 has any hardware acceleration capabilities for image processing, such as leveraging the ESP-NN library for optimized neural networ...
Best ESP Module for Wi-Fi Connectivity in Remote Monitoring with FreeRTOS and MQTT?
Hi guys i'm currently trying to do a project using ESP32, FreeRTOS, and MQTT for remote monitoring and control. I need to select an ESP module for Wi-Fi connectivity. Which module should I choose for considering the following:
1. Hosting a web server with graphics (minimum flash memory size)?
2. Reliable wireless connectivity (<200m range) in a sealed enclosure (track or wired antenna)?
3. Balancing performance and reliability: ESP32 alone or combined with ATmega328PB?
...
Solution:
and while the ATmega328PB is a reliable microcontroller, it might not offer the same performance or ease of integration for Wi-Fi and complex tasks as the ESP32. Combining the two could add unnecessary complexity unless you have specific reasons to use both.
What does the error "Core dump data check failed" mean on the ESP32 Super Mini board?
Hello, I am testing the ESP32 Super Mini board. The code compiles fine, but I get this error message:
...
E (172) esp_core_dump_flash: Core dump data check failed:
E (172) esp_core_dump_flash: Core dump data check failed:
Solution:
Hi camila, Since the serial monitor displays nothing, i think it is incorrect baud rate settings or the absence of Serial.begin(115200); in setup().
Also, do a delay after Serial.begin before calling other functions...
How to send HTML page from a Web Server asynchronously in ESP-IDF?
is it possible to send the HTML page from a Web Server in async mode upon initial client request?
tried that and all i get in the browser is the raw HTML script
maybe I am using the wrong function :
...
esp_err_t httpd_ws_send_data_async(httpd_handle_t handle, int socket, httpd_ws_frame_t *frame,transfer_complete_cb callback, void *arg);
esp_err_t httpd_ws_send_data_async(httpd_handle_t handle, int socket, httpd_ws_frame_t *frame,transfer_complete_cb callback, void *arg);
Solution:
In the ESP-IDF's HTTP server component, the
httpd_start() function sets up both a listening TCP socket for handling HTTP traffic and a control UDP socket for internal control signals. However, for serving HTTP responses, including HTML pages, you typically interact with the HTTP request and response structure provided by the server rather than directly managing sockets @te0Communication Options for Dual-Processor MIDI Control Pedalboard with ESP32
Hello,
I am currently building a MIDI control pedalboard. It will need to connect simultaneously via classic MIDI (Serial ports) and BLE-MIDI to controllers and synthesizers and via WiFi to a computer.
I have read that the ESP32 cannot handle WiFi and BLE simultaneously, and my initial tests seem to confirm this. So, I am considering using two processors, one for WiFi and the other for Bluetooth....
Solution:
I recommend using SPI. It's faster than I2C and simpler to implement than a dedicated serial connection.
MLX90640 Sensor Fails After 3-5 Minutes When Using ArduinoBLE Library
Hello everyone,
I am currently working on a project using an Arduino equipped with an MLX90640 sensor to transmit temperature images via Bluetooth Low Energy (BLE). When I use only the MLX90640 library from Adafruit, the program functions correctly and displays the temperature image as expected. However, when I include the ArduinoBLE library, the sensor operates for just 3 to 5 minutes before it fails.
Additionally, I've noticed that the dynamic memory usage spikes to 70% when both libraries are included....
Solution:
Hey @aymen ammari first signs are pointing towards memory fragmentation degrading system performance. When memory is not managed well, your Arduino might fail in a variety of ways. Sometimes, this can be as obvious as the code not uploading to your board like shown above. In other cases, everything might appear to run fine for awhile, only for the microcontroller to stop responding later on – that’s much more tricky!
Looking at your code you have many opportunities for optimizing dynamic memory usage. Mostly by moving things on flash, you will take some hit on performance.
You can rewrite the
sendLargeDataOverBLE function to cap memory usage. Here are some improvements you can make:
...I'm looking to enhance MQTT reliability for my ESP32 in IoT applications
Hi, I'm looking to enhance MQTT reliability for my ESP32 in IoT applications. My ESP32 struggles with maintaining stable connections in fluctuating network conditions, often failing to reconnect automatically after dropouts, leading to data loss. Additionally, the QoS settings sometimes don't ensure message delivery. I'm using a Mosquitto broker with the following MQTT settings: a keep-alive interval of 60 seconds, a retry count of 3, and QoS levels set to 1 for all sensor data. The error messages I encounter often indicate connection timeouts and message delivery failures. Are there specific keep-alive settings, retry mechanisms, or QoS levels that can help? Any advice on handling automatic reconnections and minimizing data loss would be greatly appreciated.
@Middleware & OS...
Solution:
Test HiveMQ. It is truely scalable
BeagleBone Black - Modbus TCP Communication Issues
Hello guys @Middleware & OS I am working on an industrial automation system using a BeagleBone Black running Embedded Linux. The system needs to monitor and control a process using multiple sensors and actuators over a Modbus TCP network. However, I encounter an issue where the BeagleBone Black intermittently loses communication with some of the Modbus devices(temperature sensors and relay). Has anyone @everybody encountered such a situation before, what did you do to resolve it and can you refer some documentation for me to go through.
THANKS IN ADVANCE!....
Solution:
@Boss lady Hi! I've had a similar issue with a
Raspberry Pi setup. It turned out to be a problem with the network configuration. Make sure your Modbus TCP settings are correctly configured and check for any IP conflicts on your network. You might also want to check the network cables and switches for any faults, it could also be due to various reasons like electrical noise or insufficient power supply. Ensure your BeagleBone Black and the Modbus devices are properly grounded. You can als...Trying to check if Lora modules are working or not
hey guys , just received package of few lora modules . I am beginner to the lora concept , i am trying to check if this modules are working or not . i have tried codes avaliable on yt and blogs but none of the seems to work . Can anyone provide me a basic code and the wiring diagram to check my lora modules .
Solution: