ADS1115
ADS1115 is a 16bits Analog to Digital Converter
The ADS1115 is a 4-Channel Analog to Digital Converter
this lib is ADS1115 drive for stm32f103
how to use it ?
you only to add the bsp_ads1115.c and bsp_ads1115.h to keil5 Project
then Init in the main function, and use GetAds1115Values function to get adc values,
for eg, use printf to show data in Serial port . and you can see there is anything else! 0.125???
int main()
{
printf_init();
ads1115_Init();
while (1)
{
printf("%f\r\n",GetAds1115Values()*0.125);
}
}
why adc values Multiply 0.125?
the ads1115 has vref insdide chip ,so we don't like others Converter use " 3.3/4096"
the values from GetAds1115Values function is inside values ,if it Multiply gain_coefficient t,then the realValues is coming !
you can change it in bsp_ads1115.c
this list is GAIN with GAIN_COEFFICIENT
typedef enum
{
GAIN_TWOTHIRDS = ADS1015_REG_CONFIG_PGA_6_144V, // 0.1875mV
GAIN_ONE = ADS1015_REG_CONFIG_PGA_4_096V, // 0.125mV
GAIN_TWO = ADS1015_REG_CONFIG_PGA_2_048V, // 0.0625mV
GAIN_FOUR = ADS1015_REG_CONFIG_PGA_1_024V, // 0.03125mV
GAIN_EIGHT = ADS1015_REG_CONFIG_PGA_0_512V, // 0.015625mV
GAIN_SIXTEEN = ADS1015_REG_CONFIG_PGA_0_256V // 0.0078125mV
} adsGain_t;