Battery voltage reading #137
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I am wondering how the battery voltage reading works, since it's using adc AIN2 that is not connected. |
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Hey @Nilon123456789, You can see here that we use channel 2 for battery measurement, and it's configured to use the VDD pin as input (via the 
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Alright thanks |
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A question just popped in my head, why do you define in the zephyr,user the io-channel adc 2, if your not using it. Is it just to be able to fetch the config of channel 2? |
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I'm not sure I follow. We do use it in adc.c:37. This is the same strategy used in this Zephyr sample. |
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Hey @Nilon123456789,
You can see here that we use channel 2 for battery measurement, and it's configured to use the VDD pin as input (via the
NRF_SAADC_VDDvalue). Channel 2 refers to the SAADC channel, and it's a different thing from theAIN2pin (which is not used for this). You can refer to section 6.23 on the datasheet for this: