Motorhome/Campervan Water Level

by John Halfords, the Netherlands

Thanks to IOT Projects Ideas
(https://iotprojectsideas.com/waterproof-ultrasonic-sensor-with-arduino-to-measure-water-level/)

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What's new:

• 0.9 First released version

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Hardware

• CPU: ESP8266 Wemos D1 Mini Pro (V3.0.0)
  https://nl.aliexpress.com/item/1005006246625522.html

• Ultrasonic Sensor: JSN-SR04T
  https://www.amazon.nl/dp/B0DDKXCCRH?ref=ppx_yo2ov_dt_b_fed_asin_title

• Display: I2C OLED Display Module 0.91 Inch (SSD1306)
  https://nl.aliexpress.com/item/1005006365845676.html

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Connections

See Schematic.png

Display:

• VCC = 3.3V !!
• SDA = D2
• SCK or SCL = D1

Ultrasonic Sensor:

• VCC = 5V
• RX Trigger pin = D5 = GPIO14
• TX Echo pin = D6 = GPIO12

Sleep

• When connecting a USB-C plug, switch off the 5v is not simple in some cases
• and you don't want to pull out you USB-C cable every time, I've made a sleep function
• Long press = Sleep
• The unit starts again with a hard reset
• SleepButton = D7 = GPIO13 (See Schematic)

ESP8266

• Internal Led = D4
• Reset switch = Pin RST to ground

If you have any ideas, build-up comment or questions, feel free to contact me: halfordsj@gmail.com