I use MIT app inventor to test on DIY T-rex kit
After input address 192.168.1.8 (my case) . I test basic function like moving forward, backward, turn left, right.
we need 
1/ Arduino Uno R3
2/ Esp8266 wifi
3/ Module L9110
4/ Usb to TTL
5/ DC motor
6/ Servo
Other equipment
1/ Android mobile phone with MIT app inventor
2/ Mini test board
3/ Electric wire
4/ Power bank
First, we start to install code for esp8266 as picture
Connect electric wire for esp8266 wifi
Second, we make circuit as showing picture
a/ provide power 3.3v and ground for esp8266 wifi
b/ TX , RX of Esp8266 connect to pin 2,3 digital
c/ connector servo to pin 10 digital, power 5v and ground.
d/ use pin 5v and ground on "Usb to TTL" to connect to Module L9110
e/ use pin 8,9 digital on Arduino Uno to control Module L9110
f/ connect to DC motor
g/ provide power to circuit
Third, we test to control DC motot and servo
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