ESP8266 ADC
来自Jack's Lab
（版本间的差异）
(以“== Overview == * 10 bit sigmal delta ADC * Internal reference voltage is 1.0 V <br><br> == Example == <source lang=cpp> </source> Output: <source lang=bash> ...”为内容创建页面) |
(→Example) |
||
| 第9行： | 第9行： | ||
<source lang=cpp> | <source lang=cpp> | ||
| + | #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); | ||
| + | } | ||
</source> | </source> | ||
2018年10月28日 (日) 17:01的版本
1 Overview
- 10 bit sigmal delta ADC
- Internal reference voltage is 1.0 V
2 Example
#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);
}
Output:
ad = 0 V*1000 = 0 ad = 0 V*1000 = 0 ad = 1024 V*1000 = 3200 ad = 1024
