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MakerChat 0x0E - Introduction to Node-RED 🔧

MakerChat

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MakerGram last edited by

This month, we're discussing Node-RED

Node-RED is a programming tool for wiring together hardware devices, APIs and online services in new and interesting ways.

It provides a browser-based editor that makes it easy to wire together flows using the wide range of nodes in the palette that can be deployed to its runtime in a single click.

In this MakerChat 0x0E we are going to learn and experiment with Node-RED using raspberry pi. We will be installing, and creating flows, nodes and GUI using Node-RED.

For Registration: https://lu.ma/makerchat0x0E

Location : KeyValue Software Systems Pvt Ltd, C113, 1st floor, Building SCK-01 SmartCity, Kakkanad, Kochi, Kerala 682042, India

Date & Time : Saturday 8th , 2:00 PM to 4:00 PM IST

FREE Registration Join and meet like-minded makers and hardware enthusiasts.

#MakerGram #MakerChat #meetup #nodered
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Join the 53rd MakerChat at MakerVillage. India’s largest electronic hardware incubator & ESDM facility, supporting hardware startups with advanced labs, incubation programs, and industry connections (MeitY initiative).

Explore how AI accelerator chips are built and discover the invisible world of the radio spectrum that powers wireless communication.

•⁠ ⁠AI Accelerators (Design to Wafer) — Alosh Denny
•⁠ ⁠Radio Spectrum & Wireless Signals — Vignesh
•⁠ ⁠Special Session: Startup Support Programs by MakerVillage CEO Mr. Venkat

️ Limited Seats – Register Now!
Feb 7 | MakerVillage
Register link: go.makerchat.co/mc0x35

A great opportunity to visit MakerVillage and learn deep-tech from industry experts.

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A

@salmanfaris No, still now , there is no improvements

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@amalkrishnam3 Hi, Were you able to make any progress.

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A

I have been working on a similar project . In which I want to capture data using the PDM mic and trasmit it through the BLE available . I am new to hardware and these sensors so I am unable to make sense of the data I am reciving on the other side(central) that is my mobile device(iphone X) with BlueLight application. I am able to find a service and I am reciving some form of hex code,but I don't know how to convert it to wave files or don't know whether it's possible or not .

If you guys have any idea or any resources that could help please do share.

I am attaching my code below :
#include <ArduinoBLE.h> #include <mic.h> // microphone library // Microphone Settings #define DEBUG 1 #define SAMPLES 800 mic_config_t mic_config = { .channel_cnt = 1, .sampling_rate = 16000, .buf_size = 1600, .debug_pin = LED_BUILTIN }; NRF52840_ADC_Class Mic(&mic_config); int16_t recording_buf[SAMPLES]; volatile static bool record_ready = false; // Updated UUIDs #define SERVICE_UUID "19B10000-E8F2-537E-4F6C-D104768A1214" #define CHARACTERISTIC_UUID_AUDIO "19B10001-E8F2-537E-4F6C-D104768A1214" // BLE Service and Characteristic BLEService audioService(SERVICE_UUID); // Corrected initialization with explicit value size and fixed length flag BLECharacteristic audioDataCharacteristic(CHARACTERISTIC_UUID_AUDIO, BLERead | BLENotify | BLEWrite, sizeof(recording_buf), true); void setup() { Serial.begin(115200); while (!Serial) delay(10); Serial.println("Initializing microphone..."); Mic.set_callback(audio_rec_callback); if (!Mic.begin()) { Serial.println("Mic initialization failed"); while (1); } Serial.println("Mic initialized."); Serial.println("Initializing BLE..."); if (!BLE.begin()) { Serial.println("Failed to start BLE!"); while (1); } BLE.setLocalName("SCT Audio"); BLE.setAdvertisedService(audioService); audioService.addCharacteristic(audioDataCharacteristic); BLE.addService(audioService); // Corrected writeValue call with explicit casting audioDataCharacteristic.writeValue((uint8_t)0); BLE.advertise(); Serial.println("BLE Peripheral is now advertising"); } void loop() { BLEDevice central = BLE.central(); if (central) { Serial.println("Connected to central device"); while (central.connected()) { if (record_ready) { // Plot the audio data in the Serial Plotter for (int i = 0; i < SAMPLES; i++) { Serial.println(recording_buf[i]); } // Transmit the audio data audioDataCharacteristic.writeValue((uint8_t*)recording_buf, 2 * SAMPLES); Serial.println("Audio data transmitted over BLE"); record_ready = false; } } Serial.println("Disconnected from central device"); } } static void audio_rec_callback(uint16_t *buf, uint32_t buf_len) { static uint32_t idx = 0; for (uint32_t i = 0; i < buf_len; i++) { recording_buf[idx++] = buf[i]; if (idx >= SAMPLES){ idx = 0; record_ready = true; break; } } }
My overall project capture the audio using the pdm mic and transmit it through the BLE and we will do a audio processing throguh api(fast api) calls . I don't know whether it's the right way to do this,but that's the overall idea .

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@mkgrmAbhinand Sorry, no simulators are available.

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