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UNO MQTT Presence & Temperature/Humidity sensor

This project is now archived. I moved home and no longer require this thing.

Arduino sketch that interface HC-SR04 ping sensor and AM2301 temperature.humidity sensor.

This code is to be used with an ATMEGA328p Uno board and a ENC28J60 Ethernet PHY device. A couple of standard libraries are included in project as they were modified for this project.

Specifics

Due to memory constraints of the ATMEGA328p, UIPEthernet lib have slightly modified compilation properties. For UIPEthernet:

  • UDP is disabled
  • ARP table hold max 4 entries
  • Reduced max open ports to 3
  • Reduced max TCP connections to 3
  • Reduced TCP packets buffer size to 4

Note: ENC28J60 was used because it was the only part I had on hand. RunningMedian library has been templated and simplified (for my needs) to hold uint8_t values rather than float.

Build setup

To be compiled using PlatformIO.

Hardware

ENC28J60 and UIPEthernet library requires usage of the ATMEAG328p SPI bus. Ping and DHT sensors only require digital IOs.