自己鼓捣个电流表可以显示10MA电流

qingkong · 发表于 2020-3-30 19:43:41

普通的USB电流表多数都显示不了《10MA的电流

虽然我买了个贵的，但是贵了就不舍得用了。。。

于是TB了模块搞个便宜的。。。

lgt8f328p -- 3.5
USB 公母头 1块钱
5块钱打板（5张）
INA219 5块
数码管 1.5

不到20块钱或者说10块钱左右。。。。。。

要我自己焊洞洞的话，肯定没这么小，虽然比USB的电流表还是要大不少。但是我觉得够了。。。
要认同自己的能力:lol:

/*
ReadAnalogVoltage
lgt8f328p读取电压 Wemos TTGO XI 8F328P-U Board
adafruit / Adafruit_INA219
*/
// the setup routine runs once when you press reset:
#include <math.h >
#include "TM1637.h"
#include <Adafruit_INA219.h>
Adafruit_INA219 ina219;
#define CLK 10//pins definitions for TM1637 and can be changed to other ports
#define DIO 9
TM1637 tm1637(CLK, DIO);
unsigned char ClockPoint = 1;
int sensorValue = 0;
unsigned char hour = 0;
unsigned char minute = 0;
int8_t TimeDisp[] = { 0x00, 0x00, 0x00, 0x00 };
//float shuntvoltage = 0;
// float busvoltage = 0;
float current_mA = 0;
// float loadvoltage = 0;
// float power_mW = 0;
void TimeUpdate(void) { int sensorValuesa=current_mA*10;
if (ClockPoint) {
tm1637.point(POINT_ON);
// Serial.println(sensorValuesa / 1);
// delay(100);
// tm1637.set(BRIGHT);
TimeDisp[0] = sensorValuesa / 100 / 10;
TimeDisp[1] = sensorValuesa / 100 % 10;
TimeDisp[2] = sensorValuesa % 100 / 10;
TimeDisp[3] = sensorValuesa % 100 % 10;
}
}
void setup() {
// initialize serial communication at 9600 bits per second:
//Serial.begin(9600);
uint32_t currentFrequency;
// Initialize the INA219.
// By default the initialization will use the largest range (32V, 2A). However
// you can call a setCalibration function to change this range (see comments).
ina219.begin();
// To use a slightly lower 32V, 1A range (higher precision on amps):
//ina219.setCalibration_32V_1A();
// Or to use a lower 16V, 400mA range (higher precision on volts and amps):
ina219.setCalibration_16V_400mA();
tm1637.init();
tm1637.set(BRIGHT_TYPICAL); //BRIGHT_TYPICAL = 2,BRIGHT_DARKEST = 0,BRIGHTEST = 7;
tm1637.point(POINT_OFF);
analogReference(INTERNAL2V56); //use internal 1.1v as Avref
//analogReference(EXTERNAL); //使用外部基准
//analogReference(type)
//描述
//配置用于模拟输入的基准电压（即输入范围的最大值）。选项有:
//DEFAULT：默认5V（Ocrobot控制板为5V）或3.3伏特（Ocrobot控制板为3.3V）为基准电压。
//INTERNAL：在ATmega168和ATmega328上以1.1V为基准电压，以及在ATmega8上以2.56V为基准电压（Ocrobot Mega无此选项）
////INTERNAL1V1：以1.1V为基准电压（此选项仅针对Ocrobot Mega）
//INTERNAL2V56：以2.56V为基准电压（此选项仅针对Ocrobot Mega）
//EXTERNAL：以AREF引脚（0至5V）的电压作为基准电压。
//参数
//type：使用哪种参考类型（DEFAULT, INTERNAL, INTERNAL1V1, INTERNAL2V56, INTERNAL4V096 或者 EXTERNAL）。
//返回
//无
uint32_t guid = (GUID3 << 24) | (GUID2 << 16) | (GUID1 << 8) | GUID0; // 给guid赋值唯一ID
//Serial.println(guid); // 串口输出唯一ID
delay(2000);
}
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
//sensorValue = analogRead(A0);
// shuntvoltage = ina219.getShuntVoltage_mV();
// busvoltage = ina219.getBusVoltage_V();
current_mA = ina219.getCurrent_mA();
// power_mW = ina219.getPower_mW();
// loadvoltage = busvoltage + (shuntvoltage / 1000);
// Serial.print("Bus Voltage: "); Serial.print(busvoltage); Serial.println(" V");
// Serial.print("Shunt Voltage: "); Serial.print(shuntvoltage); Serial.println(" mV");
// Serial.print("Load Voltage: "); Serial.print(loadvoltage); Serial.println(" V");
// Serial.print("Current: "); Serial.print(current_mA); Serial.println(" mA");
//Serial.print("Power: "); Serial.print(power_mW); Serial.println(" mW");
// Serial.println("");
delay(200);
// Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
//float voltage = sensorValue * (2.56 / 4096.0);
// print out the value you read:
//Serial.print(sensorValue);
//Serial.print(' ');
//Serial.print(cbrt(sensorValue));
//Serial.print(' ');
//Serial.println(voltage);
//delay(1000);
TimeUpdate();
tm1637.display(TimeDisp);
}