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TTGO-ESP32-Ultrasonic.ino
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config.h.template
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README.md

TTGO ESP32

This folder contains the implementation with a TTGO LoRa32 SX1276 (not available anymore? See Successor).

1. Backend Setup

For the backend setup please follow the instructions on the main readme

2. Install Libraries in Arduino IDE

  1. Install the ESP32 Core for Arduino (Installation with Boards Manager)
  2. Install the LoRa library which supports the SX1276 Chip
  3. Install CayenneLPP to package LoRa packets.
  4. Install Arduino-LMIC to send data over LoRaWan

3. ESP Setup

  1. Copy the Template: cp config.h.template config.h. (This file is filled in with private data and should not be published)
  2. Insert Application EUI (lsb), Device EUI (lsb) and App Key (msb) from the Device Overview in your TheThingsNetwork application to the config.h file. (Note: use the 'C-style' not Hex)
  3. Optional: Change in config.h the way how to read sensordata (UART/A02YYUW or Trig/Echo)
  4. Optional: Change the pins in config.h
  5. Optional: Change cycle time in config.h
  6. Optional: If you want to use a GPIO as power pin (only available for 3.3V sensor), enable it in config.h and define PWR_PIN. This should save more power during deep sleep, because some sensor always drain power.
  7. Upload sketch to your board by using the TTGO LoRa32-OLED-V1 Board from the ESP32 Core for Arduino

Notes:

  • Maybe you need to change the 'Region Configuration' of the Arduino-LMIC library. To change it, go to the lmic_project_config.h file within the LMIC Arduino library (See here).
  • When using ABP Activation instead of OTAA Activation the TTN application does not receive packages after a restart of the device. The option 'reset frame counters' in your TTN Device Overview helps (see here).

4. Wiring of the Ultrasonic Sensor

UART (A02YYUW)

  1. Connect GND of Sensor to GND of Board
  2. Connect VCC of Sensor to either 3V3 or 5V (if using a power pin, connect it to the corresponding pin, default 21 (GPIO))
  3. Connect RX of Sensor to PIN 17 (U2_TXD)
  4. Connect TX of Sensor to PIN 16 (U2_RXD)

You should also be able to use the other UART 1 connection of the board (Unforunately I'm not sure which PINs belong to the UART 1)

Sensor Information

Echo/Trig sensors (AJ-SR04M and HC-SR04)

  1. Connect GND of Sensor to GND of Board
  2. Connect VCC of Sensor to either 3V3 or 5V (if using a power pin, connect it to the corresponding pin, default 21 (GPIO))
  3. Connect Trig of Sensor to PIN 13 (GPIO)
  4. Connect Echo of Sensor to PIN 12 (GPIO)

You can also use other GPIO pins which are not used internally by the board.

5. TTGO ESP32 LoRa Pinout:

ESP Pinout

Information about Power Consumption

  • Board: active -> 66mA : deep sleep -> 20mA