Arduino-compatibile ESP8266 module's firmware for WiFi connection, photoresistor and microservos in smart-home system.
- 1x ESP8266-12E
- 1x Micro servo MG90S with removed potentiometer (for infinite rotation)
- 1x photoresistor 10 kOhm
- 2x resistor 10 kOhm
- 1x resistor 500 Ohm
- 1x LED
- 1x button switch
- 1x capacitor 2.2 mF
- 1x rectifier diode
Unfortunatelly, ESP8266 does not provide 5V output pins, so there is external power input to circut. 5V input is required to power on microservo and can be used as input standalone (via Vin pin on ESP8266).
- WiFi connectivity, broadcast and simple management
- photoresistor's resistance measurement
- microservo calibration with LED signalling
- microservo rotation
To serve connectivity UDP is used. All packets are at most 5-bytes long.
All packets starts with CMD byte to detect type of message. Bytes 2-5 contains additional information to provide actions.
| CMD type | 1b | 2b | 3b | 4b | 5b | Description |
|---|---|---|---|---|---|---|
| CMD_BRD | 0xF0 | ID | ID | 0x0 | 0x0 | module's broadcast |
| CMD_SET_REQ | 0x01 | SET | ID* | ID* | SER* | set request |
| CMD_GET_REQ | 0x02 | 0x0 | 0x0 | 0x0 | 0x0 | get request |
| CMD_GET_RES | 0x10 | ID | ID | PHR | SER | get response |
ID – U16 number, module's unique ID
SET – set indicator; 0x1 – set microservo position, 0x10 – set ID, 0x11 – set both
* – optional set parameter
PHR – photoresistor resistance, from 0 up to 255
SER – microservo position (0 - fully up, 255 - fully down)
To test some funcionalities you can run Connector, sample program written in Kotlin:
kotlinc Connenctor.kt -include-runtime -d Connenctor.jar && java -jar Connenctor.jar