AZ-GTI

1 Overview

• 信达 AZ-GTI 官网，自重 1.3kg，载重 5kg，电源 7-14V, 0.75A

• 信达AZ-gti经纬仪开光
• 信达AZGTI赤道仪模式测试兼开光
• az-gti更新az-eq固件和通过计算机控制教程
• ASIAIR与信达AZ-GTI经纬仪搭配使用指南

2 Firmware

http://www.skywatcher.com/download/software/motor-control-firmware/

3 Hack

• 主控： STM32F051R8T6 STM32
  • 64KB Flash, 8KB RAM
  • Power Supply: 2 - 3.6V (4V max)
  • PIN1/13/32/64 --- 3.3V
  • PIN12/31/63 --- GND
  • PIN46 --- SWDIO
  • PIN49 --- SWCLK
  • PIN60 (BOO0) --- R11 (10K) --- J4 --- 3.3V
  • PIN19 --- Q2 (ON 则到地) ，控制 Q1（AF4L，P-MOS，AO3415）组成的开关

• WiFi: ESP8266 官方模块（串口透传）
  • EN --- PIN54 (J1_P1)
  • IO15 (need pull-down) --- PIN53 (J1_P2)
  • IO2 (need pull-up) --- PIN52 (J1_P3)
  • IO0 (need pull-up) --- PIN51 (J1_P4)
  • RXD --- PIN16 (USART2_TX) (J1_P5)
  • TXD --- PIN17 (USART2_RX) (J1_P6)
  • RST --- C2 ---GND

• 电源： RT8258
  • https://www.richtek.com/assets/product_file/RT8258/DS8258-02.pdf
  • 1.2A, 24V, 700kHz Step-Down Converter
  • Input: 4.5V to 24V
  • Output: 0.8V to 15V
  • R1 = 100K, R2 = 32.4K（对地）, 10uH, 22uF

• Motor
  • U7_P1 --- GND
  • U7_P6 --- AO1 (CH1 Output to motor)
  • U7_P7 --- AO2 (CH1 Output to motor)
  • U7_P8 --- PGND
  • U7_P9 --- VM (Motor power supply pin, 2.5 ~ 13.5V)
    • AZ1_P4
    • ALT1_P4
    • AZ2_P3
    • Alt2_P3

• J1
  • J1_P1 --- ESP_EN
  • J1_P2 --- ESP_IO15
  • J1_P3 --- ESP_IO2
  • J1_P4 --- ESP_IO0
  • J1_P5 --- ESP_RXD
  • J1_P6 --- ESP_TXD
  • J1_P7 --- 3V3
  • J1_P8 --- GND