Increase ADC precision
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a0a05553cf
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@ -39,7 +39,7 @@ void Battery::SaadcInit() {
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nrf_saadc_channel_config_t adcChannelConfig = {.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
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nrf_saadc_channel_config_t adcChannelConfig = {.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
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.resistor_n = NRF_SAADC_RESISTOR_DISABLED,
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.resistor_n = NRF_SAADC_RESISTOR_DISABLED,
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.gain = NRF_SAADC_GAIN1_5,
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.gain = NRF_SAADC_GAIN1_4,
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.reference = NRF_SAADC_REFERENCE_INTERNAL,
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.reference = NRF_SAADC_REFERENCE_INTERNAL,
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.acq_time = NRF_SAADC_ACQTIME_40US,
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.acq_time = NRF_SAADC_ACQTIME_40US,
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.mode = NRF_SAADC_MODE_SINGLE_ENDED,
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.mode = NRF_SAADC_MODE_SINGLE_ENDED,
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@ -59,11 +59,11 @@ void Battery::SaadcEventHandler(nrfx_saadc_evt_t const* p_event) {
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(&saadc_value, 1));
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(&saadc_value, 1));
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// A hardware voltage divider divides the battery voltage by 2
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// A hardware voltage divider divides the battery voltage by 2
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// ADC gain is 1/5
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// ADC gain is 1/4
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// thus adc_voltage = battery_voltage / 2 * gain = battery_voltage / 10
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// thus adc_voltage = battery_voltage / 2 * gain = battery_voltage / 8
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// reference_voltage is 0.6V
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// reference_voltage is 0.6V
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// p_event->data.done.p_buffer[0] = (adc_voltage / reference_voltage) * 1024
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// p_event->data.done.p_buffer[0] = (adc_voltage / reference_voltage) * 1024
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voltage = p_event->data.done.p_buffer[0] * 6000 / 1024;
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voltage = p_event->data.done.p_buffer[0] * (0.6 * 8 * 1000) / 1024;
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if (voltage > battery_max) {
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if (voltage > battery_max) {
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percentRemaining = 100;
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percentRemaining = 100;
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