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本帖最后由 zintiger 于 2013-12-1 17:29 编辑
做了一个三轴陀螺仪MPU6050的试验,将数据用液晶1602显示出来。它们分别工作是正常的,但放在一起时,严格说是执行了wire.begin()以后,液晶显示的函数就乱了,显示花码。把LCD采用4bit和8bit的连接方法都是一样的问题。
下面是源代码。各位高手遇到过这样的问题吗?问题出在哪儿?
感谢你的任何建议。
感谢美国网友bperrybap的指点,问题已经解决。Leonardo板子上虽然有独立的SDA和SCL针,但pin2,pin3仍然被保留作为SDA,SCL使用。我把它们作为LCD的数据线的,固然会出问题。在调用LCD时避开它们就行了。我把这些写出来希望对大家有所帮助。
// 这个代码是没有添加算法的,所以显示的是只是原始数据!
#include <LiquidCrystal.h>
// Arduino Wire library is required if I2Cdev I2CDEV_ARDUINO_WIRE implementation
// is used in I2Cdev.h
#include "Wire.h"
// I2Cdev and MPU6050 must be installed as libraries, or else the .cpp/.h files
// for both classes must be in the include path of your project
#include "I2Cdev.h"
#include "MPU6050.h"
// class default I2C address is 0x68
// specific I2C addresses may be passed as a parameter here
// AD0 low = 0x68 (default for InvenSense evaluation board)
// AD0 high = 0x69
MPU6050 accelgyro;
int16_t ax, ay, az;
int16_t gx, gy, gz;
#define LED_PIN 13
bool blinkState = false;
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 9,8,7,6,5, 4, 3, 2); //问题就出在这儿。
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("hello, world!");
// join I2C bus (I2Cdev library doesn't do this automatically)
lcd.setCursor(0, 1);
lcd.println("Initializing I2C"); //这行和下面的一行调换一下,也会显示花码。显然Wire.begig()执行过之后,lcd类的就会有问题。
Wire.begin();
// initialize serial communication
// (38400 chosen because it works as well at 8MHz as it does at 16MHz, but
// it's really up to you depending on your project)
Serial.begin(9600);
//while(!Serial);
// initialize device
Serial.println("Initializing I2C devices...");
accelgyro.initialize();
// verify connection
Serial.println("Testing device connections...");
Serial.println(accelgyro.testConnection() ? "MPU6050 connection successful" : "MPU6050 connection failed");
// configure Arduino LED for
pinMode(LED_PIN, OUTPUT);
}
void loop() {
// read raw accel/gyro measurements from device
accelgyro.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
delay(1000);
lcd.setCursor(0, 8);
// lcd.print(millis()/1000);
lcd.print(ax); //未能被显示出来。
lcd.setCursor(0, 1);
lcd.print(ay); //照片中的乱码部分来自这里。
} |
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