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--- products:sbc:common:applications:gpio:adc [2022/12/21 21:25]
ivan created
+++ products:sbc:common:applications:gpio:adc [2022/12/21 21:28] (current)
ivan
@@ Line 1: / Line 1: @@
-===== Introduction =====
-This documentation will introduce the usage of ADC.
-===== Hardware Information =====
-The ADC  is a 12-bit successive approximation register (SAR) A/D Converter.
-^  Pin  ^ SIGNAL  ^  Voltage  ^  Device Node                                       ^
-|  10   | ADC_CH0 |  0~1.8V   |  /sys/bus/iio/devices/iio:device0/in_voltage0_raw  |
-|  12   | ADC_CH3 |  0~1.8V   |  /sys/bus/iio/devices/iio:device0/in_voltage3_raw  |
-===== Get Raw ADC Value =====
-<WRAP important >
-Replace the variable ''x'' in ''in_voltageX''raw with the corresponding channel value
-</WRAP>
-```shell
-$ cat /sys/bus/iio/devices/iio:device0/in_voltageX_raw
-```
-The following uses Pin10 as an example.
-```shell
-$ cat /sys/bus/iio/devices/iio:device0/in_voltage0_raw     // pin10 is connected to 1.8V
-$ cat /sys/bus/iio/devices/iio:device0/in_voltage0_raw    // pin10 connects to GND
-```
-Convert the raw ADC value to Voltage:
-''Voltage = (value / 4096) * 1.8V''

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