ESP32 Mailbox works on USB power but not battery - Need Help With
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Hi forum, even though it turned out to be a simple code at the end - I was thrilled that after many hours of investigation and testing I finally got my Mailbox notifier to work. It wakes from deep sleep triggered by a reed switch. Now I hooked it to a battery (I have tried both 3xAAA and 1x18650) but now it does not wake up from deep sleep. What am I missing? #define BLYNK_PRINT Serial #include <WiFi.h> #include <WiFiClient.h> #include <BlynkSimpleEsp32.h> char auth[] = "blynk code"; ch
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ESP32 Mailbox works on USB power but not battery - Need Help With My Project - Blynk Community
![](https://i.redd.it/dlha3athwk581.jpg)
DIY WiFi mailbox sensor with ~12 years of battery, featuring ESP-NOW for subsecond transmission rates and MQTT. More info in comments : r/homeassistant
![](https://europe1.discourse-cdn.com/arduino/original/4X/3/d/d/3ddbc2448f6e9f2a8ac4672b5931de34951ee85f.jpeg)
Esp32 powered only by the usb lines 5V and GND not working - Microcontrollers - Arduino Forum
![](https://ae01.alicdn.com/kf/Sb629d02ea21f49eeb97a5058d705bb68v.jpg_640x640Q90.jpg_.webp)
ESP32 Development Board WiFi+Bluetooth Ultra-Low Power Consumption Dual Core ESP-32 ESP-32S
![](https://hackaday.com/wp-content/uploads/2022/02/IoT-Mailbox-components.png)
IoT-Enabled Mailbox Lets You Check Your Mail Without Leaving Your House
![](https://community-assets.home-assistant.io/original/4X/2/3/7/237bf88ee569f4ead42fd275465cae275bd8e3e4.jpeg)
ESP32 Powering Issue - #22 by Blacky - ESPHome - Home Assistant Community
![](https://smarthomegeeks.io/content/images/2023/11/header2-1.jpg)
Upgrade Your Mailbox for Smart Snail Mail Notifications
![](https://hackaday.com/wp-content/uploads/2019/09/femto-esp32-main.png?w=800)
Tiny ESP32 Fits Inside USB-A Connector
ESP32-WROVER is a powerful and small controller with onboard camera, Wi-Fi and Bluetooth. This kit helps you learn and use ESP32-WROVER with its
![](https://m.media-amazon.com/images/I/71VUi+m+uIL._AC_UF350,350_QL80_.jpg)
AITRIP 3 PCS ESP32 ESP32-WROVER Board with Camera WiFi & Bluetooth Development Board Compatible with Arduino IDE (programing Languages Including C and
![](https://community.blynk.cc/uploads/default/original/3X/6/b/6b8279c0209b5786a0219eaa4237764291b6c70e.jpeg)
ESP32 Mailbox works on USB power but not battery - Need Help With My Project - Blynk Community
![](https://i.redd.it/dy63mu4l45381.png)
We've built multisensor hardware specifically for ESPHome and HomeAssistant : r/homeassistant