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techielew•5/22/24, 5:03 AM

We've got a special guest joining us for this one. A friend of mine, Iain Menzies-Runciman (https://www.linkedin.com/in/iainmr/), will be joining to share his experience with Linux, which spans supercomputers, resource-constrained embedded devices, and even trainings and courses. Join us to trade Linux war stories

@Event Pings

Naren_QCOM•5/22/24, 5:48 AM

Does anyone worked on SIM800L module with ESP32 using ESP-IDF framework?

I tried the basic pppos_client esp-idf example, but it's not working for me

I'm getting tthe following errors
E (10484) esp-modem: esp_modem_dte_send_cmd(256): process command timeout
E (10484) dce_service: esp_modem_dce_sync(225): send command failed
E (10484) sim800: sim800_init(159): sync failed

Yyoucef_ali hmm modeste data

InsightMike•5/22/24, 11:59 AM

Yes, the low data rates enable the very long range. It's also important to note that, if you follow the specification, that the data rate isn't under your control, it adapts to the RF conditions. You can force certain data rates to fit your application, but then you will have range trade-offs and may give up full interoperability with other LoRaWAN devices (which may or may not be important to you).

NNaren_QCOM Does anyone worked on SIM800L module with ESP32 using ESP-IDF framework? I trie...

wafa_ath•5/22/24, 7:06 PM

hello @iamnarendrans Have you tried using a serial terminal program to communicate directly with the SIM800L using AT commands? just to know whether the problem lies with the communication between the ESP32 and SIM800L (hardware or software configuration)

wafa_ath•5/22/24, 7:08 PM

also A voltage regulator might be necessary if your power supply isn't stable. What is the voltage level you're providing to the SIM800L?

Wwafa_ath hello @iamnarendrans Have you tried using a serial terminal program to communic...

Naren_QCOM•5/22/24, 7:15 PM

I've tried and verified.
It was working while I'm trying with serial AT commands

But that ESP-IDF pppos_client example is not working

IInsightMike Yes, the low data rates enable the very long range. It's also important to note...

youcef_ali•5/22/24, 7:29 PM

Thanks you

NNaren_QCOM Does anyone worked on SIM800L module with ESP32 using ESP-IDF framework? I trie...

youcef_ali•5/22/24, 7:31 PM

I have worked pppos with sim7600 i take to much time to make it work and not 100%, the issue is in the synchronization in the init, the pppos send At command and wait for feed back, meanwhile the sim module is not ready yet that causes timeout

Yyoucef_ali I have worked pppos with sim7600 i take to much time to make it work and not 100...

Naren_QCOM•5/22/24, 7:32 PM

How did you overcomed that?

NNaren_QCOM How did you overcomed that?

youcef_ali•5/22/24, 7:33 PM

First Using delays, and second do multiple attempts if synchronisation is failed do it again

Yyoucef_ali First Using delays, and second do multiple attempts if synchronisation is failed...

Naren_QCOM•5/22/24, 7:35 PM

Let me try that. Do you have any example code? If yes, can you please share it to me ?

youcef_ali•5/22/24, 7:36 PM

I'll look for the code

NNaren_QCOM Let me try that. Do you have any example code? If yes, can you please share it t...

youcef_ali•5/22/24, 7:36 PM

Not sim800

Naren_QCOM•5/22/24, 7:38 PM

It's ok man, just for reference.
I can understand the flow and make changes for sim800 according to my requirements

NNaren_QCOM It's ok man, just for reference. I can understand the flow and make changes for ...

youcef_ali•5/22/24, 7:44 PM

NNaren_QCOM It's ok man, just for reference. I can understand the flow and make changes for ...

youcef_ali•5/22/24, 7:47 PM

Here i give additional time for the modem to be ready, and make sure is turned on, and if the sync is failed restart the modem and try again

ЯΣJIП•5/23/24, 5:21 AM

LMtx•5/23/24, 7:23 AM

Is it possible to manage a global-scale IoT deployment in a no-code/low-code manner?

By global-scale IoT deployment, I mean an Internet of Things system consisting of thousands of devices and tens of applications. Effective maintenance of this complexity requires automation.

Traditionally, we used code to automate tasks, reduce support costs, and enable scalability. Is there a better way?

Can you recommend a no-code/low-code IoT platform that effectively supports global-scale deployments?

Your insights and suggestions are highly valued. Please share your recommendations!

Ben•5/23/24, 10:27 AM

Hi all,I'm working with the ESP32-CAM for recognizing QR codes. Everything worked perfectly, and I was able to recognize QR codes until I used SoftSerial to transmit the SBUS signal. I can receive the SBUS signal via RX2, but in my project, I need to transmit it to the flight controller.

Ben•5/23/24, 10:28 AM

Ben•5/23/24, 10:31 AM

Here is just the camera configuration and the two UARTs I need to use. The problem occurs when I use SoftSerial.

arudino1.91KB

Ben•5/23/24, 10:33 AM

Can anyone please help me solve this problem? I'm trying to send the SBUS signal via a GPIO pin, and I'm not sure if that's going to work.

Ben•5/23/24, 10:34 AM

ЯΣJIП•5/23/24, 11:01 AM

BBen Hi all,I'm working with the ESP32-CAM for recognizing QR codes. Everything worke...

wafa_ath•5/23/24, 1:47 PM

the issue appears to be caused by the use of Software Serial library,Use (UART) instead of Software Serial, Here's an example of the configuration on how you could use hardware UART for transmitting the SBUS signal

BBen Here is just the camera configuration and the two UARTs I need to use. The probl...

Renuel Roberts•5/23/24, 6:35 PM

Am unable to access and see your code but from your question you can use the code below:

#include <HardwareSerial.h>
#include <Wire.h>
#include "esp_camera.h"
#include "QR_Code.h"

HardwareSerial MySerial(2); // Use Serial2 for SBUS

void setup() {
Serial.begin(115200);
MySerial.begin(100000, SERIAL_8E2, RX2, TX2); // Initialize SBUS with appropriate baud rate and pins

// Camera initialization code
camera_config_t config;
config.ledc_channel = LEDC_CHANNEL_0;
config.ledc_timer = LEDC_TIMER_0;
config.pin_d0 = Y2_GPIO_NUM;
config.pin_d1 = Y3_GPIO_NUM;
config.pin_d2 = Y4_GPIO_NUM;
config.pin_d3 = Y5_GPIO_NUM;
config.pin_d4 = Y6_GPIO_NUM;
config.pin_d5 = Y7_GPIO_NUM;
config.pin_d6 = Y8_GPIO_NUM;
config.pin_d7 = Y9_GPIO_NUM;
config.pin_xclk = XCLK_GPIO_NUM;
config.pin_pclk = PCLK_GPIO_NUM;
config.pin_vsync = VSYNC_GPIO_NUM;
config.pin_href = HREF_GPIO_NUM;
config.pin_sscb_sda = SIOD_GPIO_NUM;
config.pin_sscb_scl = SIOC_GPIO_NUM;
config.pin_pwdn = PWDN_GPIO_NUM;
config.pin_reset = RESET_GPIO_NUM;
config.xclk_freq_hz = 20000000;
config.pixel_format = PIXFORMAT_JPEG;

if (psramFound()) {
config.frame_size = FRAMESIZE_UXGA;
config.jpeg_quality = 10;
config.fb_count = 2;
} else {
config.frame_size = FRAMESIZE_SVGA;
config.jpeg_quality = 12;
config.fb_count = 1;
}

// Initialize the camera
esp_err_t err = esp_camera_init(&config);
if (err != ESP_OK) {
Serial.printf("Camera init failed with error 0x%x", err);
return;
}

// QR Code recognition setup
// ...
}

void loop() {
// QR Code recognition logic
// ...

// SBUS communication logic
if (MySerial.available()) {
// Read and transmit SBUS data
while (MySerial.available()) {
int incomingByte = MySerial.read();
// Process SBUS data
}
}

// Attach your code logic here
}

This only works if you use the hardware esp32 ports instead of the software

Ben•5/23/24, 8:33 PM

With both codes, I can only receive an SBUS signal via RX2 (pin 16). However, I need to send the same SBUS signal via TX, which is not available on the ESP32-CAM. That's why I created a softSerial. The problem is that when I use the camera, everything works perfectly except the camera itself, which gives the error (GPIO is already installed)

Ben•5/23/24, 8:37 PM

I'm using two ESP32-CAMs. One ESP32-CAM sends frames to a laptop and receives x, y, z coordinates via WiFi. These values are then sent to the other ESP32 via I2C. The ESP32 generates a PWM signal based on these values and generates an SBUS signal. However, this is not an optimal solution

Ben•5/23/24, 8:38 PM

i hope that makes sense

SSaßì ** Friendly reminder about Upcoming Event** https://discord.com/invite/A9fsjr4K?...

techielew•5/23/24, 9:24 PM

Hey Linux lovers, @1158820847566471281 and @1158822820860674098, don't forget that tomorrow morning at 15:00 GMT we're going to be diving into the world of embedded linux, supercomputers, and open source with Iain Runciman. Learn how Linux has evolved and how you can evolve with it through shared experience.

See you there! https://app.livestorm.co/devheads-community/devheads-weekly-office-hours-1

ThroughPut Marketing

DevHeads Weekly Office Hours | ThroughPut Marketing

PLEASE JOIN AS A SPEAKER IF YOU WANT TO PARTICIPATE IN THE DISCUSSION!Join DevHeads' weekly Office Hours, Fridays at 3 PM (1500) GMT to meet other DevHeads and riff on a variety of topics for...

Ttechielew Hey Linux lovers, <@&1158820847566471281> and <@&1158822820860674098>, don't for...

techielew•5/24/24, 2:07 PM

@Event Pings! We'll see you in less than an hour for our weekly Office Hours: https://app.livestorm.co/devheads-community/devheads-weekly-office-hours-1

nour_oud•5/24/24, 4:44 PM

Welcome @Ming to the community! Can you introduce yourself and tell us about your professional life?

Ming•5/24/24, 4:53 PM

Quick Hi to all. I'm Ming (Iain Menzies-Runciman). I have been working with Unix/Linux for over 30 years ranging from high-end supercomputers through to the Embedded Linux systems that I currently specialise on. I spend my days building Yocto systems, integrating OTA Updates with Mender and interfacing IoT systems with cloud-based services. I have just presented on the weekly office hours - so for anyone who missed it, go catch the replay!

MMing Quick Hi to all. I'm Ming (Iain Menzies-Runciman). I have been working with Unix...

Camila_99$$•5/24/24, 5:01 PM

Hi Mr. Ming ! I was there watching, and your presentation was very useful and interesting. Thank you

MMing Quick Hi to all. I'm Ming (Iain Menzies-Runciman). I have been working with Unix...

wafa_ath•5/24/24, 5:32 PM

Hi Mr. @Ming , i was attending too , thank you so much for sharing your knowledge with us , it was really interesting and aspiring

Ben•5/25/24, 7:35 AM

Guys, I'm trying to connect an ESP32-CAM to an ESP32 using the I2C protocol. Which pins on the ESP32-CAM should I use? I used pins 14 and 15, but it is not working.

BBen Guys, I'm trying to connect an ESP32-CAM to an ESP32 using the I2C protocol. Whi...

Accur4te•5/25/24, 10:04 AM

Try d21 and d22

aymen ammari•5/25/24, 10:09 AM

Hi everyone, I'm looking for a sensor to use as body heat sensor for medical project, I'm trying to use LM35 with esp32 and IOT system but my problem is that I don't find it suitable (casing)
So any suggestions on what to use, and thank you in advance

AAccur4te Try d21 and d22

Ben•5/25/24, 11:44 AM

There is no d21 and d22 in esp32cam

Ben•5/25/24, 11:46 AM

I also tried to use Bluetooth. The master is sending data correctly, but the slave isn't even connecting to the master

Aaymen ammari Hi everyone, I'm looking for a sensor to use as body heat sensor for medical pro...

Joseph Ogbonna•5/25/24, 12:26 PM

Hey @aymen ammari I found this for you, it has higher temperature range and a very precise accuracy and a temperature tolerance of +-1%.

https://www.microscale.net/products/gy-bme280-5-bme280-5v-atmospheric-pressure-humidity-temperature-sensor-module-for-arduino-spi-iic?variant=47681006502163&currency=NGN&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gclid=Cj0KCQjwmMayBhDuARIsAM9HM8fb9QiaDce0P6ZcaPYwUdyKAQ-Z3JrGD0E2WE1Mb55sgS0ShkuKOJcaAu3rEALw_wcB

Microscale

GY-BME280-5 BME280 5V Atmospheric Pressure Humidity Temperature Sensor

Description: GY-BME280 is a Breakout Board featuring a Bosch Sensortec ME280 Temperature, Humidity & Pressure Sensor. The board has selectable I2C address jumper (solder link GS2), I2C pull-up resistors, 7 pin header 2.54mm, and two mounting holes 3.5mm. Default setting of the board; single power rail Vdd=Vdd_IO (s

Aaymen ammari Hi everyone, I'm looking for a sensor to use as body heat sensor for medical pro...

Joseph Ogbonna•5/25/24, 12:27 PM

What kind of casing type are you looking for. And where will it be placed

Jason•5/25/24, 2:25 PM

Hi. Everyone. I am looking for senior IT dev to mentor me. I can pay for this.

Jason•5/25/24, 2:25 PM

Please dm me if you are interested.

Aaymen ammari Hi everyone, I'm looking for a sensor to use as body heat sensor for medical pro...

Ming•5/25/24, 3:44 PM

I'm using one of these in a medical device for one of my projects
https://www.analog.com/en/products/max30208.html

JJoseph Ogbonna What kind of casing type are you looking for. And where will it be placed

aymen ammari•5/25/24, 3:46 PM

I want to design something to stick on my finger to measure temperature / heartbeat / SPO2 All at the same time

MMing I'm using one of these in a medical device for one of my projects https://www.an...

aymen ammari•5/25/24, 3:47 PM

It can work with Max30102 in parallel right?

Ming•5/25/24, 3:51 PM

You will need a PPG for the SpO2 & heartbeat - but yes, it will work with them in parallel

aymen ammari•5/25/24, 3:52 PM

What is PPG?

Ming•5/25/24, 3:53 PM

It's photoplethysmogram - https://en.wikipedia.org/wiki/Photoplethysmogram
Here's an article on it's use - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6426305/

Photoplethysmogram

A photoplethysmogram (PPG) is an optically obtained plethysmogram that can be used to detect blood volume changes in the microvascular bed of tissue. A PPG is often obtained by using a pulse oximeter which illuminates the skin and measures changes in light absorption. A conventional pulse oximeter monitors the perfusion of blood to the dermis an...

PubMed Central (PMC)

A review on wearable photoplethysmography sensors and their potenti...

Photoplethysmography (PPG) is an uncomplicated and inexpensive optical measurement method that is often used for heart rate monitoring purposes. PPG is a non-invasive technology that uses a light source and a photodetector at the surface of skin to measure ...

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