ESP32-C3 power issues

Ive been using esp32 dev kits for a while and have just been trying to move a project over to a seeeduino xiao esp32c3 and Im having a few issues…

1, if I try powering it by 5 or 3.3 and gnd, when my code goes to put it in sleep for 5 minutes, it just powers back on immediately. Works fine on isb power, so thats how im using it now.

2, in my code I use pin 10 to control the gate of a mosfet IRFBC40. With 1000ohm on gate and 100k across to ground. When the code sets pin 10 to low, there is still about 1.9 volts passing through, causing the fet not to turn off all the way. Which this is suppose to happen when it sleeps.

Is there something Im missing about using the seeed?

Hi there,
Welcome, Can you post the code in question using the preformatted text </> tags
How are you attaching the sleep interrupt pin?
Which Libs are you using and BSP?
GL :slight_smile: PJ

#include <WiFi.h>
#include <HTTPClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define EXPECTED_NUM_SENSORS 6 //Expected number of sensors that are connected
#define ONE_WIRE_BUS 4 // OneWire GPIO Pin
#define SENSOR_POWER_PIN 15 // GPIO pin that controls the power to the sensors
#define WAKE_UP_INTERVAL_SECONDS 5 * 60 // Time to sleep between readings in seconds (use * 60 for minutes)
#define DEVICE_NAME "COOL NAME" // Name of the unit reporting values

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

const char* ssid = "WIFI Network"; // Wifi Network
const char* password = "WIFI PASS"; // Wifi Password
const char* server = "SERVER IP"; // Server Address

void setup() {
  Serial.println("Hello World!");
  digitalWrite(SENSOR_POWER_PIN, HIGH); 
  delay(1000); // Waiting for sensors to power up before Initialization 
  Serial.println("Initializing sensors...");
  sensors.setWaitForConversion(false);  // makes it async
  delay(2000); // Waiting for sensors to report to controller 

  // Check initialization status
  int maxAttempts = 3; // Maximum number of attempts to check initialization status
  int attemptCount = 0;
  int numDevices = 0;
  bool initializationComplete = false;

  // Get the number of devices found during initialization to test if all expected sensors are reporting
  while (!initializationComplete && attemptCount < maxAttempts) {
    numDevices = sensors.getDeviceCount();
    if (numDevices < EXPECTED_NUM_SENSORS) { // Handle initialization failure: fewer sensors than expected
      Serial.println("Initialization failed. Number of devices found is less than expected. Retrying...");
      delay(500); // Delay before retrying count
    } else if (numDevices > EXPECTED_NUM_SENSORS) { // Handle initialization failure: more sensors than expected
      Serial.println("Initialization failed-successfully. More devices found than expected.");
      break; // Exits the retry loop if more devices found than expected
    } else { // Initialization successful: expected number of sensors found
      initializationComplete = true;

  if (numDevices == 0) {
    // No devices found, skip to sleep
    Serial.println("Initialization Failed, No Devices Found...");
    Serial.println("Skipping to sleep.");
    digitalWrite(SENSOR_POWER_PIN, LOW);
    esp_sleep_enable_timer_wakeup(WAKE_UP_INTERVAL_SECONDS * 1000000);
  } else if (initializationComplete) { // Proceed with other tasks after initialization completes successfully
    Serial.print("Initialization successful. Expected number of sensors (");
    Serial.println(") found.");
    Serial.println("Initialization Completed");
    // Connect to WiFi
  } else { // Proceed with other tasks after initialization fails
    Serial.print("Initialization failed. No devices found or incorrect number of devices (");
    Serial.println(") found.");
    Serial.println("Errors may occur.");
    Serial.println("Initialization Completed");
    // Connect to WiFi

void loop() {

  Serial.println("Tasks Complete.");
  Serial.println("Going to sleep...");
  digitalWrite(SENSOR_POWER_PIN, LOW);
  esp_sleep_enable_timer_wakeup(WAKE_UP_INTERVAL_SECONDS * 1000000);

void connectToWiFi() {
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 3) {
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("WiFi connected.");
  } else {
    Serial.println("WiFi connection failed.");
    Serial.println("Skipping to sleep.");
    digitalWrite(SENSOR_POWER_PIN, LOW);
    esp_sleep_enable_timer_wakeup(WAKE_UP_INTERVAL_SECONDS * 1000000);

bool sendDataToServer(String deviceName, String sensorName, float sensorValue) {
  HTTPClient http;

  String url = "http://" + String(server) + "/receive_temp.php";
  String postData = "device_name=" + deviceName + "&sensor_name=" + sensorName + "&sensor_value=" + String(sensorValue);

  Serial.println("Sending data to server...");

  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

  int httpResponseCode = http.POST(postData);

  if (httpResponseCode > 0) {
    Serial.print("HTTP Response code: ");
    return true;
  } else {
    Serial.print("Error in HTTP request: ");
    return false;

void readAndSendSensorData() {
  int numDevices = sensors.getDeviceCount();
  DeviceAddress tempDeviceAddress;
  float tempC;

  Serial.println("Acquiring sensor data before sending...");

  for (int i = 0; i < numDevices; i++) {
    sensors.getAddress(tempDeviceAddress, i);
    tempC = sensors.getTempC(&tempDeviceAddress[0]);

    String sensorName = getSensorID(i);

    if (tempC > -40 && tempC < 125) {
      String deviceName = DEVICE_NAME;
      if (WiFi.status() == WL_CONNECTED) {
        sendDataToServer(deviceName, sensorName, tempC);
      } else {
        Serial.println("WiFi not connected. Skipping data transmission.");
    } else {
      Serial.println("Invalid sensor data. Skipping data transmission.");

String getSensorID(int index) {
  DeviceAddress sensorAddress;
  if (!sensors.getAddress(sensorAddress, index)) {
    Serial.println("Unable to find address for Device " + String(index));
    return "Unknown";

  String sensorID = "";
  for (uint8_t i = 0; i < 8; i++) {
    if (sensorAddress[i] < 16) sensorID += "0";
    sensorID += String(sensorAddress[i], HEX);

  return sensorID;

I have a development, It seems that the issue isnt with the “power_pin” that goes to the mosfet, its actually the pin that communicates with the sensors. When in sleep mode it is allowing the sensor to gound through the pin. (I believe) only jist found this out and its getting pretty late for me

According to the IRFBC40 datasheet, Vgs(th)=2~4V, so it might not turn on completely at Vg=3.3V.

Seems like my board might be bad or something else, after letting it sit all night and the next day, it seems work to like a charm now. No werid voltage where its not expected.

Process, Board wakes, turns on mosfet that sends power to dallas sensors, board reads them, sends data, turns off power, sleeps. (Theres going to be a lot of sensors so the need to shut off the power justified)