Hi, I am new to Riot and a beginner in programming. I am doing an experiment on LDR sensor with Esp8266 board for reading captured data from a basic ldr sensor (the one from the arduino beginners kit). I am working on XUbuntu 20.04.4 LTS x86_64.
So far I just want to stdout the data in terminal, the long term idea is to send this information as a UDP message.
If there is a canonical way to address this need, could anybody point it out for me?
The original arduino code i am trying to replicate is the following
==Arduino==
const int ldrPin = A0;
int lastRead = 0;
void setup() {
Serial.begin(9600);
pinMode(ldrPin, INPUT);
}
void loop() {
int ldrStatus = analogRead(ldrPin);
int diff = ldrStatus - lastRead;
if (!(dif > -5 && dif < 5)) {
lastRead = ldrStatus;
Serial.println(ldrStatus);
}
delay(2000);
}
==================================
Below the main two approaches I have tried so far:
Using GPIO
For accomplishing I firstly tried to do it by following Getting Started with Arduino and RIOT-OS: Setting up RIOT-OS on Arduino.
After modyfing the Hello world example I end up with this code and without modifying its Makefile.
===== Makefile =====
USEMODULE += esp_wifi
USEMODULE += gnrc_sock
USEMODULE += gnrc_sock_check_reuse
USEMODULE += gnrc_sock_udp
USEMODULE += gnrc_ipv6
===== main.c =====
#include <stdio.h>
#include "periph/gpio.h"
#define ldrPin GPIO_PIN(2,0)
int main(void)
{
gpio_init (ldrPin, GPIO_IN);
while(1) {
puts("Light");
int ldrStatus = gpio_read(ldrPin);
printf(" %d MCU.\n", ldrStatus);
}
return 0;
}
Note please that GPIO_PIN(2,0) value I guessed from the example. I am trying to point to the Analogic 0 pin.
This program compiles and run, but it returns only 0/1, it’s not what i need. I would like to get the same kind of readings as with Arduino IDE.
I suspected I should specify the fact that is analog pin. I found GPIO_IN_ANALOG in the documentation (GPIO — RIOT 0.1.1 documentation), but when using this enum value the program does not compile anymore. I checked in the RIOT/drivers/include/periph/gpio.h, and I found out that the enum value GPIO_IN_ANALOG is not defined and I cannot find any replacement for analog readings.
Using Arduino
In this trial I did not reach that far. I added arduino module to the same makefile I used arduino functions pinMode and analogRead in a simple main function. But it would not compile.
===== Makefile =====
USEMODULE += esp_wifi
USEMODULE += arduino
USEMODULE += gnrc_sock
USEMODULE += gnrc_sock_check_reuse
USEMODULE += gnrc_sock_udp
USEMODULE += gnrc_ipv6
===== main.c =====
#include <stdio.h>
#include "Arduino.h"
#define ldrPin A0
int main(void)
{
pinMode(ldrPin, INPUT);
while(1) {
puts("Light");
int ldrStatus = analogRead(ldrPin);
printf(" %d MCU.\n", ldrStatus);
}
return 0;
}
Any idea how I can use the arduino API in Riot? or just to make an equivalent code to work with riot?
Thank you very much!