ESP8266 ADC
来自Jack's Lab
1 Overview
- 10 bit sigmal delta ADC
- Internal reference voltage is 1.0 V
2 Example
On Noduino Falcon board:
#include "noduino.h"
/*
* A0 --> 220K ---> 100K --> GND
* |
* |
* esp_adc
*/
void setup()
{
serial_begin(115200);
wifi_set_opmode(NULL_MODE);
}
void loop() {
int ad = analogRead(A0);
serial_printf("ad = %d\r\n", ad);
float V = (ad / 1024.0) * (220 + 100)/100;
serial_printf("V*1000 = %d\r\n", (int)(V*1000));
delay(5000);
}
Connect A0 to GND, Output:
ad = 0 V*1000 = 0 ad = 0 V*1000 = 0
Connect A0 to 3.3V, Output:
ad = 1024 V*1000 = 3200 ad = 1024 V*1000 = 3200
