The 5v power comes from the usb connection on the wemos. in my case it works fine. 👍 3 magnusja, Seglectic, and pmp-p reacted with thumbs up emoji All reactions WEMOS. Docs » D1 Mini Shields » Driver IC: SSD1306 (I2C Address: 0x3C or 0x3D) 2x I2C Button (customizable I2C Address, default:0x31) Pins¶ D1 mini: GPIO: WEMOS. Docs » D1 Mini Shields » I2C Interface; Two user selectable addresses; BH1750FVI Illuminance to Digital Converter; Wide range and High resolution. ( 1 LCD_I2C. Display. A library to control a 16x2 LCD via an I2C adapter based on PCF8574. The library uses the Wire.h library for I2C comunications. Author: Blackhack. Maintainer: Blackhack. Read the documentation. Compatibility. This library is compatible with all architectures so you should be able to use it on all the Arduino boards. Releases How many binary sensors can a Wemos D1 Mini handle? I am looking to monitor about 30 binary sensors (magnetic door sensors). They will be hardwired, all terminated in the same place. I know I can monitor these with a Tasmotized Wemos D1 Mini, but I can only find out how to monitor one. 仕様 [0.96 インチ 4Pin IIC I2C ブルー OLED ディスプレイ モジュール Arduino対応]を使ってみる。 主な仕様は次のようになっています。 I2C通信 ディスプレイコントローラ: SSD1306 解像度: 128×64 電圧: 3.3V-5V ライブラリ 次の2つライブラリが必要 Adafruit_GFX Adafruit_SSD1306 こちらを参考に… Reset switch of the Wemos is working correctly. D3 - GPIO0 - The interrupt is working, however : Programming the Wemos very hard 9 out of 10 times NOT possible when INT line from PCF is connected, Wemos application does NOT start at PowerUp when INT line is connected (probably starts in bootmode), Reset switch of the Wemos is working correctly. Here’s a summary of the most relevant specs of the DS18B20 temperature sensor: Communicates over one-wire bus. Power supply range: 3.0V to 5.5V. Operating temperature range: -55ºC to +125ºC. Accuracy +/-0.5 ºC (between the range -10ºC to 85ºC) For more information consult the DS18B20 datasheet. The Wemos ESP32-S2 is a small Wi-Fi module based on the ESP32-S2FN4R2. The S2 is a new version of the well-known Wemos D1 Mini. The biggest update to the S2 is about twice as many I/O pins in the same form factor. This means that most shields intended for the Wemos D1 Mini can also be used for this module. The Wemos S2 Mini is easy to program 1. Wemos D1 Mini Pro. The power required for the Wemos board is supplied from a LiPovBattery through a slide switch. 2. Current Sensor . The Current Sensor INA219 is connected to the Arduino board in I2C communication mode ( SDA and SCL pin). 3. OLED Display. Similar to the current Sensor, the OLED display is also connected to the Arduino board jQid.