ESP8266 Humidity Sensor (DH11)

Simple program to post humidity sensor data to a specified endpoint

Supports both http and https

Prerequisites

Arduino CLI
CP210x USB to UART Bridge VCP Driver
openssl
dotnet core sdk (3.1)

Getting Started

Run the example http server

cd ExampleHumidityServer
dotnet build .
dotnet run -p ExampleHumidityServer.csproj

Download dependencies

In another terminal session, run the following script to list out your connected boards and update the ardunio-cli repository with the esp8266 index

./bootstrap.sh

Example output

These are the boards connected
Port                            Type              Board Name FQBN Core
/dev/cu.usbserial-14310         Serial Port (USB) Unknown

Updating arduino index
Updating index: package_index.json downloaded
Updating index: package_esp8266com_index.json downloaded
Downloading esp8266 dependencies
esp8266:esp8266@2.7.1 already downloaded
esp8266:xtensa-lx106-elf-gcc@2.5.0-4-b40a506 already downloaded
esp8266:mkspiffs@2.5.0-4-b40a506 already downloaded
esp8266:mklittlefs@2.5.0-4-fe5bb56 already downloaded
esp8266:python3@3.7.2-post1 already downloaded

Take note of the port that you want to use, in this case, /dev/cu.usbserial-14310

Build & Run the code

Run the following script to compile and run the code

./run.sh "/dev/cu.usbserial-14310" "https://your-server-ip/humidity" "SSID" "password"

Example output

Compiling code
Executable segment sizes:
IROM   : 228492          - code in flash         (default or ICACHE_FLASH_ATTR)
IRAM   : 26784   / 32768 - code in IRAM          (ICACHE_RAM_ATTR, ISRs...)
DATA   : 1248  )         - initialized variables (global, static) in RAM/HEAP
RODATA : 688   ) / 81920 - constants             (global, static) in RAM/HEAP
BSS    : 24880 )         - zeroed variables      (global, static) in RAM/HEAP
Sketch uses 257212 bytes (24%) of program storage space. Maximum is 1044464 bytes.
Global variables use 26816 bytes (32%) of dynamic memory, leaving 55104 bytes for local variables. Maximum is 81920 bytes.
Deploying code to esp8266:esp8266:nodemcuv2:xtal=80  on /dev/cu.usbserial-143120
No new serial port detected.
esptool.py v2.8
Serial port /dev/cu.usbserial-143120
Connecting....
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: 50:02:91:7a:1d:f2
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 261360 bytes to 192957...
Wrote 261360 bytes (192957 compressed) at 0x00000000 in 18.7 seconds (effective 111.8 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

Run the following command to read the serial output

cat < "/dev/cu.usbserial-14320"

At this point, you should see data hitting the example server

Server:

info: ExampleHumidityServer.Controllers.HumidityController[0]
      Received 58%
info: ExampleHumidityServer.Controllers.HumidityController[0]
      Received 58%
info: ExampleHumidityServer.Controllers.HumidityController[0]
      Received 59%

Esp8266: