1.6 KiB
Control I/O pins with a webhook
This is an Arduino IDE sketch for a "smart" controller that can activate pins based on the state of some webpage. The motivating use cases are:
- Controlling a PC power switch remotely, using a transistor wired to the power switch pins
- Lighting specific LEDs to create a remotely controlled 'traffic light'.
This sketch currently targets only the ESP8266, and will probably not work with other microcontrollers. Support for other boards may come if I run out of ESP8266's.
Configuration
First:
cp config.h.example config.h
Then edit config.h and fill in the correct values for your environment.
PIN_MAP in config.h is an array of pins that we want to control. Each item in the array is itself an
array, with the following format:
[output_pin, control_mode]
The index of the item in the top-level array is its 'index' value in the webhook. (see webhook data, below)
output_pin is the pin to control.
control_mode is either 0 or 1. 0 is for momentary mode; that is, when the state is active the pin will
only be high for a short time. 1 is for latched mode; the pin will stay high until the state changes.
Building
Just run make to build the code. You need to have config.h and data/ca_cert.pem defined.
Webhook data
The webhook should always return a page in the following (JSON-compatible) format:
[state_0, state_1, ...]
Where index and state are both integers. If you are expecting momentary input, you should return the state to '0' after the page is served / the webhook is consumed.
Future Improvements
- make it actually work...
- use WifiManager?