Automation using Wi-Fi

Automation using Wi-Fi

Wi-Fi(Wireless-Fidelity) is a Wireless communication protocol part of IEEE 802.11 standard
Wi-Fi is commonly used to create ad-hoc  network by creating access point.Unlike Bluetooth Many wifi devices can connect to same access point. ESP8266 is a Serial Wi-Fi module.

It has eight pins starting from 

Row-1

Top right (1) Vcc(3.3v) level sensitive  

Top left (2) Rx 

Row-2

 Right(3) Reset - connect it to 3.3v for normal operation

 Left (4) GPIO1 - Can be used as I/O

Row-3

 Right(5) CH_PD- connect it to 3.3v for normal operation

 Left(6) GPIO2- Can be used as I/O

Row-4

Right(7) Tx

Left(8) Gnd

Similar to Bluetooth configure Wi-Fi in AT command mode 

using USB-TTL converter 

 CoolTerm software

1. AT - OK

2. AT+CIOBAUD ?

GIVES COMMUNICATION BAUD RATE

3. AT+CIPMUX=1

CONNECT WITH MANY DEVICES

4. AT+CWMODE=3

STATION+ACCESS POINT

5. AT+CIFSR

GIVES DEVICE IP

6.AT+CWSAP="NAME","PASSWORD",5,3

TO CREATE ACCESS POINT

7.AT+CIPSERVER=1,80

START SERVER AT PORT-80

Microcontroller pins cannot drive relay directly hence a driver circuit is required.

Driver should have good current gain. CE or CC configuration is preferred

Relay has 5 terminals 

1. Vdc - 5v

2.Gnd- connect it to  Collector pin of BJT

3. Common - Connect it to AC/DC source

4. NC- Normally close connect it to load1 

5. NO- Normally open connect it to load2

or else connect only one load to any of these two pins (4,5)

so that you can switch only one device at a time.

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