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Update voltage divider math #26

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Update voltage divider math #26

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4 changes: 2 additions & 2 deletions README.md
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Expand Up @@ -21,7 +21,7 @@ Please make sure that no more than 5v regulated is being supplied to the Arduino
**Voltage reading (optional):**
Add a voltage divider between supply and ground, highest resistance value towards positive (R1), middle going to A0.
Choose resistors in the tens of kiloohms range, with a ratio appropriate for the intended supply voltage.
e.g. R1=33k, R2=5.1k, ratio of 6.471, measurement range 21.3V (3.3V Arduino reference * 6.471)
Set VOLT_DIVIDER to 1024/measurement range e.g. 1024/21.3 = 48, then adjust as necessary if not precise enough.
e.g. R1=33k, R2=5.1k, ratio of 7.471 ((33+5.1)/5.1), measurement range 24.7V (3.3V Arduino reference * 7.471)
Set VOLT_DIVIDER to 4096/measurement range e.g. 4096/24.7 = 166, then adjust as necessary if not precise enough.

![Arduino DJI 03 RC ARM Wiring](https://i.imgur.com/88jpdS7.png)
2 changes: 1 addition & 1 deletion arduino_DJI_03_RC_ARM.ino
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Expand Up @@ -30,7 +30,7 @@ CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
#include "OSD_positions_config.h"

#define ANALOG_IN A0 // Voltage Read pin (notice this is now Pin 0, instead of Pin 1)
#define VOLT_DIVIDER 48 // Set to 1024/full scale voltage
#define VOLT_DIVIDER 48 // Set to 4096/full scale voltage
//#define DEBUG //uncomment to see diagnostics from USB serial

#define FC_FIRMWARE_NAME "Betaflight"
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