working simple ec-meter

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interfisch 2023-03-30 17:55:45 +02:00
commit 880c46bc78
8 changed files with 212 additions and 0 deletions

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.pio
.vscode/.browse.c_cpp.db*
.vscode/c_cpp_properties.json
.vscode/launch.json
.vscode/ipch
.pioenvs
.piolibdeps
.clang_complete
.gcc-flags.json

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{
// See http://go.microsoft.com/fwlink/?LinkId=827846
// for the documentation about the extensions.json format
"recommendations": [
"platformio.platformio-ide"
],
"unwantedRecommendations": [
"ms-vscode.cpptools-extension-pack"
]
}

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{
"cmake.configureOnOpen": false
}

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README.md Normal file
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# EC-Meter for ESP32
Circuit from: https://publiclab.org/notes/bhickman/05-09-2016/conductivity-and-temperature-meter

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This directory is intended for project header files.
A header file is a file containing C declarations and macro definitions
to be shared between several project source files. You request the use of a
header file in your project source file (C, C++, etc) located in `src` folder
by including it, with the C preprocessing directive `#include'.
```src/main.c
#include "header.h"
int main (void)
{
...
}
```
Including a header file produces the same results as copying the header file
into each source file that needs it. Such copying would be time-consuming
and error-prone. With a header file, the related declarations appear
in only one place. If they need to be changed, they can be changed in one
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new version when next recompiled. The header file eliminates the labor of
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find one copy will result in inconsistencies within a program.
In C, the usual convention is to give header files names that end with `.h'.
It is most portable to use only letters, digits, dashes, and underscores in
header file names, and at most one dot.
Read more about using header files in official GCC documentation:
* Include Syntax
* Include Operation
* Once-Only Headers
* Computed Includes
https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

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This directory is intended for project specific (private) libraries.
PlatformIO will compile them to static libraries and link into executable file.
The source code of each library should be placed in a an own separate directory
("lib/your_library_name/[here are source files]").
For example, see a structure of the following two libraries `Foo` and `Bar`:
|--lib
| |
| |--Bar
| | |--docs
| | |--examples
| | |--src
| | |- Bar.c
| | |- Bar.h
| | |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
| |
| |--Foo
| | |- Foo.c
| | |- Foo.h
| |
| |- README --> THIS FILE
|
|- platformio.ini
|--src
|- main.c
and a contents of `src/main.c`:
```
#include <Foo.h>
#include <Bar.h>
int main (void)
{
...
}
```
PlatformIO Library Dependency Finder will find automatically dependent
libraries scanning project source files.
More information about PlatformIO Library Dependency Finder
- https://docs.platformio.org/page/librarymanager/ldf.html

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platformio.ini Normal file
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; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32doit-devkit-v1
framework = arduino
monitor_speed = 115200

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src/main.cpp Normal file
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#include <Arduino.h>
#define EC_PIN_ADC 4
#define EC_PIN_FREQ 5
#define EC_PWM_CH 0
#define EC_RESOLUTION 8
#define EC_FREQUENCY 5000
#define EC_ARRAY_SIZE 1024
uint16_t ec_array[EC_ARRAY_SIZE];
uint16_t ec_array_pos=0;
unsigned long ec_last_read=0;
#define EC_READ_INTERVAL 1
unsigned long last_print=0;
float getMean(uint16_t* parray);
uint16_t getMin(uint16_t *parray);
uint16_t getMax(uint16_t *parray);
void setup() {
Serial.begin(115200);
pinMode(EC_PIN_ADC,INPUT);
ledcSetup(EC_PWM_CH, EC_FREQUENCY, EC_RESOLUTION);
ledcAttachPin(EC_PIN_FREQ, EC_PWM_CH);
ledcWrite(EC_PWM_CH, 127);
}
void loop() {
unsigned long loopmillis=millis();
bool flag_print=false;
if (loopmillis>ec_last_read+EC_READ_INTERVAL) {
ec_last_read=loopmillis;
ec_array_pos++;
flag_print= ec_array_pos==EC_ARRAY_SIZE;
ec_array_pos%=EC_ARRAY_SIZE;
ec_array[ec_array_pos]=analogRead(EC_PIN_ADC);
//Serial.print(ec_array[ec_array_pos]); Serial.print(" ");
}
//if (flag_print) {
if (loopmillis>last_print+250) {
last_print=loopmillis;
Serial.print(getMean(ec_array),3);
Serial.print("\t"); Serial.print(getMax(ec_array) - getMin(ec_array));
Serial.println();
}
}
float getMean(uint16_t *parray) {
double mean=0;
for (uint16_t i=0;i<EC_ARRAY_SIZE;i++) {
mean+=parray[i];
}
return mean/EC_ARRAY_SIZE;
}
uint16_t getMin(uint16_t *parray) {
uint16_t min=65535;
for (uint16_t i=0;i<EC_ARRAY_SIZE;i++) {
if (parray[i]<min) {
min=parray[i];
}
}
return min;
}
uint16_t getMax(uint16_t *parray) {
uint16_t max=0;
for (uint16_t i=0;i<EC_ARRAY_SIZE;i++) {
if (parray[i]>max) {
max=parray[i];
}
}
return max;
}