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Arduino

Serial connection

  • screen /dev/ttyUSB0 115200
  • picocom /dev/ttyUSB0 -b 115200
  • microcom -p /dev/ttyUSB0 -s 115200

Arduino Nano v3

To program it, choose arduino board with ATmega328

NodeMCU

French tutorial to use it with Arduino

  • Select the appropriate port (eg. /dev/ttyUSB0)

  • Select the appropriate board: NodeMCU 1.0 ESP-12E (that's what I have)

  • Deep Sleep or here

Serial.print("Entering deep sleep");
ESP.deepSleep(60 * 1000000, WAKE_RF_DEFAULT);
delay(2000);

To get a MicroPython prompt:

  • unplug the D0/RST cable if any
  • sudo esptool.py --port /dev/ttyUSB0 erase_flash
Serial port /dev/ttyUSB0
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
MAC: xxxxxxx
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 7.5s
Hard resetting via RTS pin...

  • sudo esptool.py --port /dev/ttyUSB0 --baud 115200 write_flash --flash_size=detect -fm dio 0 esp8266-20190125-v1.10.bin

  • Connect to serial port: sudo microcom -s 115200 -p /dev/ttyUSB0 and you will get the Python >>> prompt.

DHT22

Install Adafruit Unified Sensor and DHT Sensor librairies in Arduino IDE.

#include <DHT.h>
#define DHTTYPE DHT22
uint8_t DHTPIN = D5;

DHT dht(DHTPIN, DHTTYPE);

void setup() {
     ...
     dht.begin();
     ...
}

void loop() {
     float temperatureC = dht.readTemperature();
     float humidity = dht.readHumidity();
     if (isnan(temperatureC) || isnan(humidity)) {
     	Serial.println(F("Failed to read from DHT sensor"));
     }
}
NodeMCU board Micropython
D6 machine.Pin(12)
D4 machine.Pin(2) 
>>> import dht
>>> import machine
>>> d = dht.DHT22(machine.Pin(2))
>>> d.measure()
>>> d.temperature()
19.3
>>> d.humidity()
53.1
Micropython Board
0 D3
2 D4
4 D2
5 D1
9 SD2
10 SD3
12 D6
13 D7
14 D5
15 D8
16 D0

Read an analog value

To read an analog value:

from machine import ADC
adc = ADC(0)
adc.read()

DS18B20

Example

Wemos D1 mini

Instructions

In Arduino:

If you get the error "board d1 unknown" see solution here

Download a firmware

Identify the chip:

$ python3 esptool.py -b 115200 --port /dev/ttyACM0 flash_id
esptool.py v4.1
Serial port /dev/ttyACM0
Connecting....
Detecting chip type... Unsupported detection protocol, switching and trying again...
Connecting....
Detecting chip type... ESP32
Chip is ESP32-PICO-D4 (revision 1)
...

Read the firmware:

$ python3 esptool.py -b 115200 --port /dev/ttyACM0 read_flash 0x00000 0x400000 flash_4M.bin