Cool, Raspberry Pi is very powerful, I am looking forward to your tutorial; GA25-370 motor is 6-12V voltage, locked current 3A; servo is 4.8-7.2V voltage, I did not use another power supply to power servo I used the 5v on the board. If you need to supply additional servo power, remember to share the ground.
I use 2S, 2200mah, I can use it for about an hour.This is my mail box：firstname.lastname@example.org
Bluetooth I use BC04, the serial port of the motherboard can be used, the wiring is very simple, other line sequences do not need to be changed, the mobile APP and code can be downloaded above.
Sorry, I haven't seen your message for a long time. I don't know if you have solved this problem. You can try to test it with other code.
This is a metal robot. If you need 3D images, you need to print it yourself, or you can purchase it globally, which is convenient.
Differential Steering Car With Arduino
Differential Steering Car W...View Instructable »
made in china https://shop73109108.taobao.com/?spm=a230r.7195193.1997079397.2.CYuq4Z
Hi，I buy the motor drive online, peak current 23A, you can also choose www.pololu.com.
Sorry, it's only now.I use Arduino UNO R3 and high current motor drive, remote control using PS2
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Servo Steering Robot Car With Arduino
Their own design frame and motor bracket, turned to cup is 1:16 model cars
Servo Motor Car With ArduinoView Instructable »