Hi everyone!
I'm a big fan of the Friends project, but as a beginner, I've found the current firmware setup to be quite challenging. Therefore, I've taken the initiative to simplify things by rewriting the code into a straightforward .ino file.
Setup:
This code utilizes the mic.h (please download the ZIP file from the existing project as the current release is non-functional.) and ArduinoBLE libraries.
To set up the Seeed nRF52 mbed-enabled Boards library (more details here):
Go to File > Preferences, and add the following URL to "Additional Boards Manager URLs": https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json
Navigate to Tools > Board > Boards Manager..., type "seeed nrf52" in the search box, select the latest version of Seeed nRF52 mbed-enabled, and install it.
If you encounter a Permission Denied issue, you can find a fix here.
Please note that it's not fully functional yet. I attempted to replicate the original code, but when running the Python script to generate audio recordings, it doesn't work. I suspect there are some issues with the sampling rate, samples, buf_size, etc., but I'm struggling to grasp how to fix this on my own.
To Do:
- Rectify the data transmission process.
- Incorporate blinking LEDs.
- Determine how to monitor battery level.
The code :
#include <ArduinoBLE.h>
#include <mic.h>
#define SAMPLES 400
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;
#define SERVICE_UUID "19B10000-E8F2-537E-4F6C-D104768A1214"
#define CHARACTERISTIC_UUID_AUDIO "19B10001-E8F2-537E-4F6C-D104768A1214"
BLEService audioService(SERVICE_UUID);
BLECharacteristic audioDataCharacteristic(CHARACTERISTIC_UUID_AUDIO, BLERead | BLENotify, sizeof(recording_buf), true);
void setup() {
Serial.begin(115200);
while (!Serial);
Mic.set_callback(audio_rec_callback);
if (!Mic.begin()) {
Serial.println("Mic initialization failed");
while (1);
}
if (!BLE.begin()) {
Serial.println("Failed to start BLE!");
while (1);
}
BLE.setLocalName("Friend");
BLE.setDeviceName("Friend");
BLE.setAdvertisedService(audioService);
audioService.addCharacteristic(audioDataCharacteristic);
BLE.addService(audioService);
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) {
audioDataCharacteristic.writeValue((uint8_t*)recording_buf, sizeof(recording_buf));
record_ready = false;
}
}
Serial.println("Disconnected from central device");
}
}
static void audio_rec_callback(uint16_t *buf, uint32_t buf_len) {
// Convert uint16_t buffer to int16_t buffer
for (int i = 0; i < SAMPLES; i++) {
recording_buf[i] = (int16_t)buf[i];
}
record_ready = true;
}