ESP8266 ADC
来自Jack's Lab
（版本间的差异）
(→Example) |
(→Example) |
||
| 第39行： | 第39行： | ||
| − | Output: | + | Connect A0 to GND, Output: |
<source lang=bash> | <source lang=bash> | ||
| 第46行： | 第46行： | ||
ad = 0 | ad = 0 | ||
V*1000 = 0 | V*1000 = 0 | ||
| + | </source> | ||
| + | |||
| + | |||
| + | Connect A0 to 3.3V, Output: | ||
| + | |||
| + | <source lang=bash> | ||
ad = 1024 | ad = 1024 | ||
V*1000 = 3200 | V*1000 = 3200 | ||
ad = 1024 | ad = 1024 | ||
| + | V*1000 = 3200 | ||
</source> | </source> | ||
2018年10月28日 (日) 17:03的最后版本
[编辑] 1 Overview
- 10 bit sigmal delta ADC
- Internal reference voltage is 1.0 V
[编辑] 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
