MQTest

Testing paho.mqtt.golang library, paho.mqtt.embedded-C library and using the ESP32 Microcontroller to control fans based on various criteria.

Docker

• (complete) Build out Dockerfiles for each application.
• (complete) Update go applications to use docker networking
• (complete) Build docker-compose.yml

GO

• Binaries are statically compiled
  • CGO_ENABLED=0 GOOS=linux go build -ldflags "-w -s" -o <executable_name>
• Binaries are included in repo for docker-compose
  • (in progress) Need to develop a better way of building and then including with Docker as necessary.

ESP32

• Must install and configure the Xtensa toolkit and setup the build environment.
• (in progress) Schematic for circuits to be prepared and uploaded.

mcu-mq

• Sets up the wireless network and establishes a connection with a MQTT server.
• Publishes test messages about once every three seconds.

pwm-test

• During testing the PWM generated signal would cause incorrect results in the tach signal readings and was rectified by placing a 10pF capacitor between the tach pin and ground.
• First part reads tach signal from GPIO pin and calculates the RPM of a fan (2 pulses per revolution).
• (in progress) Second part will implement functions to control fan speed via PWM.

th-test

• A DHT-11 temperature and humidity sensor is connected to the ESP32 and uses the RMT features to collect readings.
• Currently the ESP32 APB operates at 80MHz so the values have been adjusted for RMT.
• The code use to parse the data is repetitive and should be refactored.
• The DHT-11 sensor used for testing seems to be faulty and returns incorrect values for humidity although the temperature readings seem to fall within the margin of error.

sht3x

• Adds code to gather readings from SHT31D sensor via I2C bus.
• Command codes and formulas for converting readings are taken from datasheet dated March 2017, version 4.
• Some code is repetitive for clarity and should be refactored.
• Only implements Reset, Status, and one-shot measurements. Only features needed for right now.

Photon

• The code setups up the pins for reading tach signal and for outputting the PWM for control.
• The main loop will publish the RPM value on the cloud interface every 2 seconds
• After 40 seconds the duty cycle is change from either 50% to 100% or vice versa.

Future plans

• Implement system for logging and data reporting (Kibana, InfluxDB, etc).
• Build out website.