ESP8266 tempsensor
A 2-in-1 quick and dirty code for a "little smarter home". Allows for multiple DS18B20 sensors to be attached on GPIO 2 and read with HTTP request (with their IDs), and it can also control output on GPIO 16 (because my dev board for ESP-201 has a relay on this pin).
I made this for my own use as home temperature control. One ESP with a relay for controlling 24V heater input, and multiple ESPs as temperature sensors around the house. Because the firmware image is about only 200kB and can fit into every ESP, I saw it easier to have just a single firmware for all my ESPs and doesn't care what to load on each.
Build
- Clone esp-open-sdk
- Build the sdk (and add it to your PATH)
- Clone this project
- Edit the
Makefile(path of SDK, serial port with your ESP8266, ... Or you can specify these variables withmake VAR=value) - Prepare your ESP to be flashed
- Run
make && make flash
Use
The ESP is listening on port 80 and you can connect either with a browser, or telnet. In both cases the use is straightforward.
Browser access shows all connected DS18B20 separated by new line when accessing index (http://1.2.3.4/). With /relay-on and /relay-off, you can control the output of GPIO 16. There is no answer for relay control other that "HTTP/1.0 200 OK". Note that there is no HTML to parse at all.
Telnet allows three commands. relay-on, relay-off and temperature.
Current version is limited to 5 attached DS18B20. If you need more, change DS_MAX_PROBES in drivers/ds18b20.h.
License
My code is licensed under MIT, but some parts in driver/ are under another licension.