COB20*2 字符 测试程序，串行接口协议，可调LCD对比度-20*2 Chars test code cob,serial interface,support adjust the contrast ratio of the lcd

液晶1脚接1602黑色排母的1脚 如果是无背光的液晶只有14个脚 排母右边空2个位 请把液晶对比度电位器顺时针调制10点钟方向，请勿多调超出极限位置会损坏电位器！-LCD 1 feet connected to 1602 black row mother of the 1 foot if there is no backlight LCD only 14 row row mother row right empty the 2 bit Please adjust the LCD co