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--- products:sbc:edge2:applications:gpio:adc [2022/12/06 03:54]
nick
+++ products:sbc:edge2:applications:gpio:adc [2022/12/06 21:03] (current)
hyphop [Hardware Information]
@@ Line 5: / Line 5: @@
 ===== Introduction =====
-The previous part of this page introduces ADC related information.The second part guides you to obtain ADC conversion values.
+This documentation will introduce the usage of ADC on the Edge2 IO board.
 <WRAP important >
-For Edge2, in order to use the ADC function, you need to attach the IO extension board.
+For Edge2, in order to use the ADC function, you need to attach the Edge2 IO board.
 </WRAP>
-===== ADC Information =====
+===== Hardware Information =====
-<WRAP info >
+The ADC on the Edge2 IO board is a 12-bit successive approximation register (SAR) A/D Converter.
-The ADC is an 12-bit Successive Approximation Register (SAR) A/D Converter.
-</WRAP>
+^  Pin  ^  Voltage  ^  Device Node                                       ^
+|  9    |  0~1.8V   |  /sys/bus/iio/devices/iio:device0/in_voltage4_raw  |
-|           ^  ADC       ^  PIN  ^   GPIO Name  ^
-^  Edge2    |  ADC_CH2   |   9   |  SARADC_IN4  |
-===== ADC conversion =====
+===== Get Raw ADC Value =====
-Use the following command to view the device node and read the ADC conversion value.
 ```shell
-$ cd && ls /sys/bus/iio/devices/iio:device0
-buffer           in_voltage2_raw  in_voltage6_raw   of_node        trigger
-dev              in_voltage3_raw  in_voltage7_raw   power          uevent
-in_voltage0_raw  in_voltage4_raw  in_voltage_scale  scan_elements
-in_voltage1_raw  in_voltage5_raw  name              subsystem
 $ cat /sys/bus/iio/devices/iio:device0/in_voltage4_raw
+```
-```
+Convert the raw ADC value to Voltage:
+''Voltage = (value / 4096) * 1.8V''

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