240414 water pump
【額定電壓】DC 3.7V
【空載電流】1.2A
【額定功率】8W
【重量】68克
heater:
about 2 Ohm,
power with li-ion battery
I think it's a mosfet only
Heltec ESP32+OLED+Lora, hardware testing
you can easily find some good boards from china, but most of them lack of accurate document... Hrere is an example; https://hackaday.io/project/26991-esp32-board-wifi-lora-32 the board looks good with lora and a 128x64 OLED, but the IIC and reset connection is important, since pin can be muxing easily, so every board could be different. pinMode(16,OUTPUT); digitalWrite(16, LOW); // set GPIO16 low to reset OLED delay(50); digitalWrite(16, HIGH); // while OLED is running, must set GPIO16 to high and, if needed, edit your Wire.begin() to Wire.begin(4,15); (4 = SDA 15 SCL) i tested it with the Adafruit SSD1306 and the Acrobotics SSD1306 Librarys both work. Display size is 128x64 There are discussions on these boards on TＴＮ as a LORA node..or maybee single ch gateway? Heltec has a git : https://github.com/Heltec-Aaron-Lee And there is another copy call TTGO https://de.aliexpress.com/item/TTGO-LORA32-868-915-Mhz-SX1276-ESP32-Oled-display-Bluetooth-WIFI
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