Hi all,
I’m using a RAK4631 with the WisBlock base board 19007. I have a serial TTL sensor (3.3V) connected to RX1, directly on the board pins (no I/O module). I can successfully read data from the sensor on Serial1, save it to flash, and send it via LoRaWAN — but I can’t manage to power down the WisBlock board during sleep, so my sensor keeps drawing 2 mA.
Using digitalWrite(WB_IO2, LOW); has no effect. Even when the board wakes up (digitalWrite(WB_IO2, LOW); delay(30000);), I can’t seem to cut power to the sensor.
Am I missing something?
I’m considering using a MOSFET to control power to the sensor… does anyone have a better idea?
Hope someone can help.
Best regards,
-
What firmware are you using? (RUI3 or Arduino BSP or other IDE (e.g. STM32CubeIDE)?
Arduino BSP + platformIO -
What firmware version? Can it be obtained with AT+VER=?
AT+VER=WisBlock API 2.0.21
- How can we replicate the problem?
Try digitalWrite(WB_IO2, LOW) and monitor voltage between GND and VDD pins.
- Provide source code if custom firmware is used or link to example if RAKwireless example code is used.
void setup_app(void)
{
Serial.begin(115200);
time_t serial_timeout = millis();
// On nRF52840 the USB serial is not available immediately
while (!Serial)
{
if ((millis() - serial_timeout) < 5000)
{
delay(100);
digitalWrite(LED_GREEN, !digitalRead(LED_GREEN));
}
else
{
break;
}
}
digitalWrite(LED_GREEN, LOW);
// Set firmware version
api_set_version(SW_VERSION_1, SW_VERSION_2, SW_VERSION_3);
MYLOG("APP", "Setup application");
g_enable_ble = false;
}
/**
* @brief Final setup of application (after LoRaWAN and BLE setup)
*
* @return true
* @return false
*/
bool init_app(void)
{
pinMode(WB_IO2, OUTPUT); //WB_IO2 controls the supply voltage called 3V3_S.
digitalWrite(WB_IO2, HIGH);
init_custom_at();
Wire.begin();
MYLOG("APP", "Initialize RTC");
init_rtc(); // Initialisation de l'RTC seulement une fois
MYLOG("APP", "RTC ok");
restart_advertising(15);
MYLOG("APP", "Initialize application");
digitalWrite(WB_IO2, LOW);
return true;
}
/**
* @brief Handle events
* Events can be
* - timer (setup with AT+SENDINT=xxx)
* - interrupt events
* - wake-up signals from other tasks
*/
void app_event_handler(void)
{
MYLOG("APP", "app_event");
// Timer triggered event
if ((g_task_event_type & STATUS) == STATUS)
{
g_task_event_type &= N_STATUS;
MYLOG("APP", "Timer wakeup");
// Alimentation capteurs
pinMode(WB_IO2, OUTPUT);
digitalWrite(WB_IO2, HIGH);
time_t timeout = millis();
Serial1.begin(9600);
while (!Serial1)
{
if ((millis() - timeout) < 5000)
{
delay(100);
}
else
{
break;
}
}
delay(1000); // Stabilisation
// Préparation payload
payload.reset();
read_rtc(); // Remplit sensor.unix_time
readMB7389(); // Remplit sensor.us_distance
// Lecture tension batterie (moyenne sur 10)
float batt_level_f = 0.0;
for (int i = 0; i < 10; i++)
{
batt_level_f += read_batt();
}
batt_level_f /= 10.0;
sensor.batteryVoltage = (uint16_t)(batt_level_f);
// Ajout au payload LoRa
payload.addVoltage(LPP_CHANNEL_BATT, sensor.batteryVoltage);
char iso_time[21]; // Buffer pour ISO 8601
unixToIso8601(sensor.unix_time, iso_time, sizeof(iso_time));
// Log format texte
MYLOG("DATA", "time : %s, distance =%u mm, Batt=%.3f V",iso_time, sensor.us_distance, sensor.batteryVoltage/1000.0);
// --- ENREGISTREMENT FLASH ---
create_filename(); // Remplit pt_LOG_fileName (selon date/heure)
initFlash();
writeDataToFlash(pt_LOG_fileName);
endFlash();
// Log hex du payload
char hexDump[512];
for (int i = 0; i < payload.getSize(); i++)
{
sprintf(&hexDump[i * 2], "%02X", payload.getBuffer()[i]);
}
MYLOG("PAYLOAD", "Payload hex: %s", hexDump);
// Transmission LoRa
if (g_lorawan_settings.lorawan_enable)
{
if (g_lpwan_has_joined)
{
lmh_error_status result = send_lora_packet(payload.getBuffer(), payload.getSize());
switch (result)
{
case LMH_SUCCESS:
MYLOG("APP", "Packet enqueued");
break;
case LMH_BUSY:
MYLOG("APP", "LoRa transceiver busy");
break;
case LMH_ERROR:
MYLOG("APP", "Packet error (DR too low?)");
break;
}
}
else
{
MYLOG("APP", "Not joined, skip sending");
}
}
Serial1.flush(); // Vide les transferts en cours (si tu en faisais)
Serial1.end();
digitalWrite(WB_IO2, LOW);
MYLOG("APP", "down");
}
}