iotsaGPIO - web server that interfaces to hardware signals
This is a wifi http server that allows access to some 3.3v hardware signals (analog input, digital input, digital output, PWM output). It is built using the iotsa framework.
Home page is https://github.com/cwi-dis/iotsaGPIO. This software is licensed under the MIT license by the CWI DIS group, http://www.dis.cwi.nl.
As distributed the service allows access to 6 digital ports (which can be configured as input, input with pullup, output or PWM-output) and one analog input. In addition there is a readonly port timestamp which returns the number of milliseconds since boot.
Software requirements
- Arduino IDE, v1.6 or later.
- The iotsa framework, download from https://github.com/cwi-dis/iotsa.
Or you can build using PlatformIO.
Hardware requirements
- a iotsa board. Alternatively you can use any other esp8266 board, but then you may have to adapt the available I/O pins.
REST API
GET /api/io will return the current value of all current input ports.
PUT /api/io expects an object that can contain name : value pairs for any ports configured as output or pwm___output.
GET /api/ioconfig will return an object with name-value pairs containing the current configuration of each port:
'input'for input ports (digital, analog or timestamp),'input_pullup'for digital input ports with the internall pullup resistor enabled (so open inputs read as 1 in stead of a random undefined value).'output'for digital output ports.'pwm_output'for digital output ports that present a pseudo-analog output value using pulse-width modulation.'unused'for ports that are not in use.
PUT /api/ioconfig allows to set the configuration for each port, using the same values as above. The device must be in configuration mode.