Constant esp_idf_hal::adc::attenuation::adc_atten_t_ADC_ATTEN_DB_2_5

source ยท 
pub const adc_atten_t_ADC_ATTEN_DB_2_5: u32 = 1; // 1u32
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<The input voltage of ADC will be attenuated extending the range of measurement by about 2.5 dB (1.33 x)